59results about How to "Rich electrochemical active sites" patented technology

The invention provides an MXene nanosheet interlamellar spacing regulation method. The method includes that interlamellar spacing regulation is realized through MXene nanosheet surface modification with ionic liquid of imidazole salts, piperidine salts and pyridine salts. Organic positive ions in ionic liquid aqueous solution are combined with MXene nanosheets with electronegative surfaces throughthe Coulomb force to realize MXene material surface modification. After moisture removal, long-chain organic functional groups of MXene interlamellar organic positive ions play a role in supporting to prevent close stacking of the MXene nanosheets. More importantly, by changing of adding quantity of ionic liquid, the interlamellar spacing can be quantitatively adjusted in a range of 1.26-1.69nm.The regulated MXene nanosheets can serve as an electrode material to be applied to the field of energy storage of lithium ion batteries, sodium ion batteries, supercapacitors and the like and have excellent electrochemical performances and a promising application prospect.

The invention discloses a cobalt-nickel-double-metal-hydroxide-nanosheet / carbon-nitride-coated nitrogen-doped hollow graphene sphere composite material and a preparation method thereof, and application as a supercapacitor electrode material. The composite material comprises a cobalt-nickel-double-metal-hydroxide-nanosheet / carbon-nitride-coated nitrogen-doped hollow graphene sphere has a 3D spherical appearance; and the specific surface area is 100 to 1000m<2> / g and the average pore diameter of 1 to 200mm. In addition, the preparation method includes the following steps: preparing a small polystyrene sphere; preparing a polyaniline-coated graphene sphere; preparing a carbon-nitride-coated nitrogen-doped hollow graphene sphere; and preparing a cobalt-nickel-double-metal-hydroxide-nanosheet / carbon-nitride-coated nitrogen-doped hollow graphene sphere composite material. Therefore, a problem of series agglomeration of the cobalt-nickel double-metal hydroxide unit structure during the traditional preparation technology process is solved effectively; and a novel method is provided for preparing an electrode material with advantages of large specific surface area, high flexibility, high electric capacity, and high stability.

The invention discloses an electrocatalyst for efficiently decomposing water into hydrogen and oxygen and a preparation method of the electrocatalyst. With the adoption of a two-step hydrothermal method, NiCo2S4 nanosheets with different thicknesses are constructed by regulating and controlling concentration of growth-promoting media. The nanosheets with the thicknesses being 70-80 nm have good electrochemical surface area, excellent electronic transmission capacity and more reaction active sites, and show excellent performance in the reaction of decomposing water into hydrogen and oxygen with GaAs solar cells. Meanwhile, the catalyst is high in element content, low in cost and good in catalysis performance, adopts a simple preparation technology and provides basic application research for the field of direct light-to-hydrogen conversion.

The invention relates to the technical field of supercapacitor materials, and in particular relates to a hollow core-shell structure supercapacitor material Fe-Co-S / NF as well as a preparation methodand an application thereof. The method comprises the following steps of 1) preparing a cobalt source, an organic ligand and a solvent into a reaction solution, and soaking nickel foam in the reactionsolution to react to obtain Co-MOF / NF; 2) enabling the Co-MOF / NF to be soaked in a ferrous sulfate water solution, after completing, then taking out Co-MOF / NF and performing drying to obtain LDH@Co-MOF / NF; and (3) enabling a sulfur source, the solvent and the LDH@Co-MOF / NF to be reacted in a sealing condition, and drying the reaction product after the reaction is ended, so as to obtain the product. According to the preparation method disclosed by the invention, the cobalt-based MOF grows on the foamed nickel to serve as a template for in-situ synthesis of a Fe-Co-S electrode material with ultra-high-performance; and when the electrode material is used for constructing a high-performance supercapacitor self-supporting electrode material, super-high mass specific capacitance is shown.

The invention discloses a preparation method and application of a nickel sulfide / graphene composite material, and relates to the field of electrochemical materials. The graphite is exfoliated to formgraphene, and nickel sulfide is grown at the surface of the graphene by employing a microwave method. Nickel sulfide nanostructures in the prepared composite material are uniformly distributed at thesurface of the graphene, are tightly connected with a graphene sheet layer and are stable in structure. The electrochemical test data of the composite material show that the synergistic effect of thenickel sulfide and the graphene enables the composite material to develop the advantages of the nickel sulfide and the graphene, so that a supercapacitor electrode material with the advantages of lowimpedance, high specific capacitance, high cycling stability and the like is obtained. The electrode material is high in preparation efficiency, simple in process, safe and environment-friendly, and has potential application value in industrial production of the supercapacitor.

The invention discloses a carbon-sulfur composite positive electrode for a lithium-sulfur battery and a preparation method of the carbon-sulfur composite positive electrode, and belongs to the technical field of lithium-sulfur batteries. The carbon-sulfur composite positive electrode consists of a carbon-sulfur composite layer and a conductive carbon layer which are sequentially coated on the current collector; the carbon-sulfur composite layer is composed of a sulfur material, a carbon material I and an aqueous binder, and the conductive carbon layer is composed of a carbon material II and anorganic binder. According to the double-layer carbon-sulfur composite positive electrode prepared by the method, the construction of a high-sulfur-capacity, high-sulfur-content, high-specific-capacity and long-cycle-life high-energy-density lithium-sulfur battery can be realized. The preparation method of the composite positive electrode is simple and convenient to operate, low in cost and easy to amplify, the design and preparation of the positive electrode of the lithium-sulfur battery are effectively promoted, and a new possibility is provided for the practicability of the lithium-sulfur battery with high energy density.

The invention discloses a Te-doped MXene material and a manufacturing method thereof. The method comprises the following steps of (1) adding MXene and a Te source to a dispersing agent according to amass ratio of 1:0.01 to 1, preparing a dispersion liquid with a concentration of 1 to 100 mg / ml, and stirring 1-5 hours; (2) heating the dispersion liquid to 100 to 220 DEG C, reacting 10 to 24 hours,and then cooling to a room temperature; (3) cleaning a product obtained in the step (2) with a cleaning agent, and then centrifuging; and (4) carrying out vacuum drying on the centrifugal product obtained in the step (3) to obtain the Te-doped MXene material. Compared with an un-doped MXene material, by using a composite material manufactured in the invention, through Te doping, a space between MXene layers can be increased, and more electrochemical active sites are generated, which is good for ion diffusion; and electrode conductivity, a potassium storage capacity , and cycle stability are increased.

The invention discloses a preparation method of a sulfur, nitrogen and phosphorus codoped porous carbon material for a supercapacitor, and belongs to the technical field of a new energy source. Ginkgoleaves are used as a carbon source; deionized water is used for cleaning and removing surface impurities; after cleaning and drying, crushing is performed; the crushed ginkgo leaves and complex alkali metal hydroxide are uniformly mixed; in inert gas, the temperature is raised at a speed rate of 5 DEG C / min to reach activation temperature; heat insulation is performed for 2h to obtain an activated product; finally, the activated product is subjected to acid washing neutralization; deionized water is used for cleaning until a neutral state is reached; drying, grinding and sieving are performedto obtain the porous carbon material for the supercapacitor. The ginkgo leaves are used as raw materials for preparing the carbon material for the supercapacitor; the energy is saved; the environmentis protected; the process is simple; the cost is low; the sulfur, nitrogen and phosphorus self doping can be realized, so that the electrochemical active sites are increased; the wettability with electrolyte is enhanced; the porous carbon material has wide market application prospects when being used as a supercapacitor electrode material.

The invention relates to a method for preparing ultra-thin porous nickel selenide nanosheet array by etching manganese-doped nickel hydroxide, which relates to the technical field of electrode materials for supercapacitors. As that electrode material structure of the exist transition metal selenide nano-sheet is unreasonable, if the electrode material is an ultra-thin nano-sheet structure, the electrode material cannot be porous, and the ion mobility and the contactable active site are affect; the electrode material structure of the transition metal selenidenano-sheet is unreasonable. If the nanosheets are porous, the thickness is too thick, the contact active sites are too few, and the energy storage is too low, so the capacitance performance is too low. Methods: 1. Preparation of reaction solution; 2, preparing a manganese doped nickel hydroxide nano sheet array; 3, selenide treatment; Fourthly, acid etching, that is, a method of preparing ultrathin porous nickel selenide nanolithicarray by etching manganese-doped nickel hydroxide is completed. The invention provides the method used for preparing ultra-thin porous nickel selenide nanosheet array by etching manganese doped nickelhydroxide.

The invention relates to a Fe-Co-S nanosheet material and a preparation method thereof and application. The preparation method comprises steps: S1, soluble cobalt salt, soluble iron salt, urea and ammonium fluoride are dissolved in water, thiourea is added after even stirring, and a hydrothermal reaction is conducted; and S2, after the hydrothermal reaction is finished, cooling, centrifuging, washing and drying are carried out to obtain the Fe-Co-S nanosheet material. Compared with the prior art, the Fe-Co-S nanosheet material is synthesized through one-step hydrothermal synthesis, the material has a porous nano structure with a high effective specific surface area, more electrochemical active sites and a rapid ion transport path can be provided, the preparation method of the material is simple and environmentally friendly, the synthesis time is greatly shortened, and large-scale production of Fe-Co-S nanosheet materials is facilitated.

The invention relates to a thermal battery cell based on an embedded current collector plate composited FexNi<1-x>S2 cathode. An inert current-limiting ring is placed between an anode current collector plate and an embedded current collector plate composited FexNi<1-x>S2 cathode layer and covers a diaphragm layer and an anode layer, wherein the embedded current collector plate composited FexNi<1-x>S2 cathode layer is prepared by pressing an embedded current collector plate and cathode powder FexNi<1-x>S2 through a pressing machine. In the thermal battery cell, by using the inert current-limiting ring outside the diaphragm layer and the anode layer, ignition of the anode of the battery cell during activation of the thermal battery can be prevented and overflowing of the electrolyte and LiBalloy on the anode during operation of the thermal battery is avoided; therefore, the problem of local short-circuit or overall failure of the thermal battery during operation in a severe condition are solved; furthermore, the specific discharge capacity of the cathode is increased.

The invention provides a cathode catalyst for hollow nano water electrolysis, and a preparation method thereof. The method comprises the following steps: 1, adding potassium ferricyanide into a mixedsolution of a cobalt salt and sodium citrate according to the molar ratio of the cobalt salt to the potassium ferricyanide of (0.1-1): (0.2-0.5), then standing still, separating an obtained product, and sequentially washing and drying to obtain a prussian blue-like compound; and 2, carrying out annealing treatment on the prussian blue-like compound and NaH2PO2 under a protective gas according to amass ratio of (0.2-0.4): (1-2) to obtain the cathode catalyst for hollow nano-electrolysis of water. The method is uniform in reaction heating, simple and easy to operate and easy to control, the used raw materials are low in cost, the target product is easy to obtain, and the prepared catalyst is of a hollow structure and has excellent electrocatalytic activity and cathode reaction stability.

The invention relates to a preparation method of a nanocluster divalent silver oxide positive electrode material. The method comprises the following steps: pressing silver powder into silver plates; carrying out electrochemical pulse oxidation on the silver plates in an alkaline solution; and then washing and drying the silver plates, thereby finishing the preparation process of the nanocluster divalent silver oxide positive electrode material. By an electrochemical pulse oxidation method, the divalent silver oxide positive electrode material formed by clusters comprising silver oxide nanoparticles is prepared by adjusting the pulse frequency and controlling the growth morphology of the divalent silver oxide positive electrode material; the sizes of the nanoparticles are about 500nm; the sizes of the clusters are about 5 microns; and relatively large pores are formed between the clusters, so that ionic migration is facilitated; the size distribution is uniform; the product purity is high; the nanoclusters have multiple electrochemical active sites; the electrochemical activity is high; and the nanocluster divalent silver oxide positive electrode material has excellent discharge rate, very low electrode polarization and especially high electrochemical utilization rate, has excellent electrical properties, is simple in preparation process and does not contain other substance residues.

The invention provides a flexible stripped uric acid sensor capable of detecting body fluid in real time, and a preparation method thereof, and relates to the field of the flexible sensor. The preparation method comprises arranging a detection electrode module on a flexible substrate, the detection electrode module comprises a counter electrode, a working electrode and a reference electrode orderly arranged from top to bottom in parallel, and three electrodes are mutually parallel and free from contacting with each other; two ends of each of the counter electrode, the working electrode and thereference electrode are a working area and an electrode connecting area, the working areas of the three electrodes are located at the same side, and insulating layers are covered on middle parts of the three electrodes, thereby enabling the working areas of the three electrodes to insulate from the electrode connecting areas thereof; the nitrogen-doped carbon material of the load metal nano-particles sensitive to the uric acid is covered on the working area of the working electrode. The substrate of the uric acid sensor is made of a flexible insulating material, the sensitivity is high, and the flexibility is good; compared with the enzyme sensor, the enzyme inactivation and like defects can be avoided, the preparation condition is simple, and the condition is easy to control.

The invention relates to a preparation method of an electrocatalyst, in particular to a preparation method of an electrocatalyst with multiple defects and active sites, and aims to solve the problemsof expensive noble metal catalysis price, rare reserves, low electrocatalytic efficiency in electrocatalytic decomposition of water, poor stability after long-time use and complex preparation of electrodes by using a powder type electrocatalyst in the field of hydrogen production by water electrolysis. The method comprises the following steps: 1, stirring and dissolving metal salt, ammonium fluoride and urea in deionized water to obtain a mixed solution; 2, dipping a conductive substrate in the mixed solution, and carrying out a heat preservation reaction to obtain the conductive substrate onwhich a precursor grows; and 3, putting a reaction source and the conductive substrate on which the precursor grows into a chemical vapor deposition device to react, thereby completing the preparationmethod of the electrocatalyst with multiple defects and active sites.

The invention discloses a modified Ppy-MXene composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: adding pyrrole into an MXene dispersion liquid, and carrying out polymerization reaction to obtain the Ppy-MXene composite material, preparing the ionic liquid into an ionic liquid-in-water microemulsion; and mixing the ionic liquid-in-water microemulsion with the solution of the Ppy-MXene composite material, and carrying out ultrasonic treatment to obtain the modified Ppy-MXene composite material. The prepared composite material is easy and efficient to operate, raw materials are cheap and easy to obtain, complex equipment is not needed, and the composite material has excellent rate capability and cycle life in a wide temperature range.

The invention discloses a preparation method of an MOFs derived cobalt sulfide particle composite carbon material. The method comprises the following steps: 1, simultaneously adding 0.4-0.8 g of cobalt nitrate hexahydrate and 1.5-2g of 2-methylimidazole into 50mL of deionized water, and stirring till that the cobalt nitrate hexahydrate and the 2-methylimidazole are completely dissolved to obtain a solution A; 2, soaking pretreated 3 * 3cm hydrophilic carbon cloth in the solution A for standing, and then cleaning and drying to obtain carbon cloth A; 3, putting the carbon cloth A into a porcelain boat, introducing a gas in an inert gas atmosphere, and calcining to obtain carbon cloth B, wherein the temperature is 480-600 DEG C, heat preservation is performed for 0.5-2 h, and a heating rate is 2-5 DEG C / min; 4, dissolving a sulfur source in ethylene glycol, and adjusting the pH value to 10.5-11 to obtain a solution B with the sulfur source concentration of 0.25-0.42 mol / L; and 5, putting the carbon cloth B into the solution B, sealing, putting into a drying oven, reacting at 155-175 DEG C for 15-20 hours, and washing and drying after the reaction is finished. The cobalt sulfide particles in the prepared composite material are small in size, and the method has a high charge-discharge specific capacity and an excellent rate capability.

The invention discloses an enzyme-free blood glucose sensor microelectrode of a Pt / Au nano-alloy modified acupuncture needle with a cabbage structure and a preparation method of the enzyme-free blood glucose sensor microelectrode. The method comprises the following steps: placing a stainless steel acupuncture needle serving as a working electrode, Ag / AgCl serving as a reference electrode and a Pt wire serving as a counter electrode in an H2SO4 solution containing HAuCl4, and depositing AuNPs on the acupuncture needle by adopting voltage deposition to obtain Au / AN; au / AN serves as a working electrode, Ag / AgCl serves as a reference electrode, a Pt wire serves as a counter electrode, the Au / AN, the Ag / AgCl and the Pt wire are placed in an H2SO4 solution containing H2PtCl6, PtNPs are deposited on the surface of AuNPs through voltage deposition, and a Pt / Au / AN electrode is obtained; the Pt / Au / AN electrode of the cabbage structure provides abundant electrochemical active sites for glucose oxidation, and the formed sensor shows good electrocatalytic activity, wide linear range and high selectivity and sensitivity for glucose oxidation.

The invention discloses a method for improving the performance of a Co(OH)2 supercapacitor through double-potential-interval activation, and the method comprises the steps: taking foamed nickel as a substrate, taking cobalt nitrate as a nickel source, taking urea as a nucleating agent, and obtaining a Co(OH)2 precursor nanowire array through a hydrothermal method; and performing cyclic voltammetry treatment on the precursor in different potential intervals to obtain the activated Co(OH)2 electrode. A cyclic voltammetry method is adopted, after a Co(OH)2 precursor is activated in a positive potential interval, a large number of nanosheets are formed on the surface of the nanowire, more electrochemical active sites are achieved, electrolyte infiltration and electrolyte ion transmission are facilitated, charging and discharging are conducted under the current density of 10 mA cm<-2>, and the specific capacitance is increased to 1.78 F cm<-2>; and after activation in the negative potential interval, part of Co2+ is reduced into Co elementary substances, the internal resistance of the sample is reduced to 1.28 ohm, and the specific capacitance is increased to 2.12 F cm<-2>, which is 1.2 times of that of the sample only activated in the positive potential interval and 3.8 times of that of the sample not activated.

The invention belongs to the field of nanometer welding, and particularly discloses an Ostwald nanometer welding method which is used for performing surface electronic localization treatment on a metal nanoparticle film to be treated so as to strengthen Ostwald nanometer welding. According to the method, the conditions are mild and controllable, nanometer welding can be efficiently achieved, and in addition, a nanometer film obtained through welding is excellent in conductivity, electrochemical sensing performance and the like and has good application prospects.

The invention discloses an electrode material with a crystalline-amorphous concerted catalytic interface. The electrode material comprises crystalline-state Ni (OH) 2 and amorphous-state NiMoS, wherein the amorphous-state NiMoS is obtained by converting Ni (OH) 2, and the concerted catalytic interface is formed between the crystalline-state Ni (OH) 2 and the amorphous-state NiMoS. The invention further discloses a preparation method of the electrode material with the crystalline-amorphous concerted catalytic interface. The preparation method is specifically implemented according to the steps of 1, preparing an in-situ growth crystalline Ni (OH) 2 nanosheet precursor on a titanium mesh; and 2, carrying out molybdenum vulcanization treatment on the crystalline Ni (OH) 2 nanosheet precursor obtained in the step 1 to prepare the crystalline Ni (OH) 2 and amorphous NiMoS electrode material with the concerted catalytic interface.

The invention discloses a preparation method of a cobalt nickel sulfide-MXene electrode material for a supercapacitor, and belongs to the technical field of capacitor electrode material preparation. The preparation method comprises the following steps: (1) preparation of a thin MXene nanosheet layer, (2) preparation of an MXene-MOF precursor material, and (3) preparation of a finished product electrode material. The invention provides the preparation method of the cobalt nickel sulfide-MXene electrode material for the supercapacitor, and the method overcomes the limitation of poor conductivity of the cobalt nickel sulfide, so that the conductivity and cycling stability of the cobalt nickel sulfide are greatly improved under the condition that the material has large specific capacitance.

The invention discloses a preparation method of an amorphous transition metal hydroxide electrode material, which comprises the following steps: by taking a mixed solution of soluble metal salt and water-soluble polymer as an electrolyte and a porous conductive substrate as a working electrode, immersing the porous conductive substrate into the electrolyte, and performing electrochemical deposition to prepare the amorphous transition metal hydroxide electrode material. The preparation method is simple, efficient and mild in condition, and the prepared amorphous transition metal hydroxide electrode material comprises a porous conductive substrate layer and an amorphous transition metal hydroxide nanosheet network structure growing on the porous conductive substrate layer in situ. The amorphous transition metal hydroxide electrode material is high in active substance loading capacity, high in specific capacitance, good in rate capability and cycle performance and wide in application prospect in preparation of energy storage devices such as supercapacitors.

The invention discloses a preparation method of fusiform platinum nanoparticles. The preparation method comprises the following steps: placing a working electrode and an auxiliary electrode in an electrolyte containing chloroplatinic acid, zinc nitrate and ammonium acetate for constant-current deposition, placing an obtained deposition product in an acid solution or an alkali solution for dissolution to remove zinc oxide, and performing cleaning and vacuum drying to obtain fusiform platinum nanoparticles with a porous structure. Compared with the traditional preparation method, the porous fusiform platinum nanoparticles synthesized by the preparation method disclosed by the invention have the advantages of regular morphology, uniform size, large specific surface area, excellent electrocatalytic performance and the like, and have very high use value and very good application prospect; and meanwhile, no surfactant or other additives are used in the synthesis process, adsorption of related additives on the surfaces of the particles is avoided, and the method has the advantages of being low in energy consumption, easy and convenient to obtain raw materials, environmentally friendly, free of toxicity and pollution and the like, and facilitates expression of the catalytic activity of the precious metal nanoparticle catalyst and follow-up electro-catalytic performance research.

The invention provides a defective K0.5Mn2O4 nano material, a preparation method and a zinc ion battery. The preparation method comprises the following steps of obtaining K0.5Mn2O4 powder growing on the surface of a substrate material by utilizing a hydrothermal method; and the K0.5Mn2O4 powder being subjected to plasma treatment, and the defect type K0.5Mn2O4 nano material is obtained. Accordingto the preparation method, the defect type K0.5Mn2O4 nano material prepared by adjusting the plasma etching time is stable in performance and structure and high in capacity, and can be used as an electrode material of a zinc ion battery.

The invention provides a flexible strip-shaped pH sensor capable of detecting body fluid in real time, and a preparation method thereof, and relates to the field of flexible sensors. According to thepreparation method, a detection electrode component is disposed on a flexible substrate, the detection electrode component comprises a working electrode and a reference electrode, which are disposed side by side and are parallel and not in contact with each other. The both ends of the working electrode and the reference electrode are respectively working areas and electrode connecting areas, the working areas of the working electrode and the reference electrode are located on the same side, the middles of the working electrode and the reference electrode are covered with insulating layers, sothat the respective working areas and electrode connecting areas of the working electrode and the reference electrode are insulated from each other, and the working area of the working electrode is provided with a nitrogen-doped carbon material of load metal nanoparticles sensitive to hydrogen ions. The substrate of the pH sensor is made of a flexible insulating material, thereby having high sensitivity and good flexibility, and is low in cost compared with a glass electrode, furthermore, the preparation conditions are simple, and the conditions are controlled easily.

The invention relates to a Ce-Co-S composite material and a preparation method and application thereof. The preparation method of the composite material comprises the steps that soluble cobalt salt, soluble cerium salt, urea and ammonium fluoride are dissolved in water, and then thioacetamide is added for a hydrothermal reaction; and after the thermal reaction is finished, cooling, centrifuging, washing and drying to obtain the Ce-Co-S composite material. The composite material is prepared into a working electrode which is used in a supercapacitor. Compared with the prior art, the Ce-Co-S composite material is synthesized through one-step hydrothermal synthesis, the preparation method is environmentally friendly, simple and convenient, large-scale production is facilitated, and the Ce-Co-Scomposite material has the advantages of being high in specific surface area, very high in specific capacitance, good in cycle performance and high energy density, excellent in electrochemical performance and the like.

The invention discloses a lithium ion capacitor battery and a preparation method thereof. The preparation method comprises the four steps of preparing an anode, preparing a cathode, preparing electrolyte and preparing the lithium ion capacitor battery. synthesized flower-shaped nano molybdenum disulfide is large in specific surface area, so that more electrochemical active sites can be generated on the surface of the flower-shaped nano molybdenum disulfide, meanwhile, the reaction contact area between the flower-shaped nano molybdenum disulfide and electrolyte can be increased, the reaction process is accelerated, and therefore the specific capacity and electrochemical activity of a nano molybdenum disulfide-based electrode material are effectively improved; a nitrogen-doped porous carbon material has rich pore structures, the molybdenum disulfide nanoflowers can grow in the pore structures in situ, so that the accumulation and agglomeration phenomena of the molybdenum disulfide nanoflowers can be slowed down to a certain extent, and meanwhile, the problem of volume expansion of the molybdenum disulfide in the continuous intercalation and deintercalation process of Li < + > can be avoided, so that the cycling stability and the rate capability of the nano molybdenum disulfide-based electrode material are effectively improved.

The invention discloses a self-supporting high-density copper-cobalt-selenium nanotube electrolysis water electrode and a preparation method thereof, which belong to the field of electrocatalytic water decomposition. The preparation method of the catalytic electrode comprises the following steps: firstly, combining copper and cobalt in a first-step hydrothermal reaction to form a nanowire structure; and then, through a second-step hydrothermal reaction, combining copper and cobalt components in the nanowire with a selenium element, and generating a densely-arranged nanotube array structure under the action of a Kirkendall effect. The prepared self-supporting high-density copper-cobalt-selenium nanotube electrode can provide a relatively large electrochemical active surface area, more active sites are exposed, and relatively excellent cathode hydrogen evolution, anode oxygen evolution and full hydrolysis performance can be realized under an alkaline condition.