12 results about "Reversible hydrogen electrode" patented technology

The present invention provides a hydrogen supply system that can supply hydrogen to a reversible hydrogen electrode constituting the reference electrode of an electrochemical measuring instrument over a long period of time, and that can be used even in environments where high-pressure gas cylinders cannot be used, and a reference electrode system equipped with this hydrogen supply system. [Solution] The hydrogen supply system comprises a solid polymer water electrolyzer 1 that generates hydrogen gas by electrolyzing water, a gas-liquid separator 2 into which the hydrogen gas generated by the solid polymer water electrolyzer 1 is introduced and which removes water contained in the hydrogen gas, and a hydrogen supply line 3 for supplying the hydrogen gas from which water has been removed by the gas-liquid separator 2 to a reversible hydrogen electrode. The reference electrode system comprises the above hydrogen supply system A and a reversible hydrogen electrode B to which hydrogen gas is supplied from the hydrogen supply system A, and preferably further comprises a liquid level holding mechanism 8 and a hydrogen concentration management mechanism 9 that can maintain a constant liquid level and hydrogen concentration in the reversible water electrode B.

The invention discloses a reversible hydrogen electrode capable of adjusting and controlling the hydrogen speed and a manufacturing method and application thereof.The reversible hydrogen electrode comprises a reference electrode body, the reference electrode body is hollow, an opening is formed in the bottom of the reference electrode body, the upper end of the reference electrode body is connected with an integrated connecting pipe, a detachable mounting cover is mounted on the connecting pipe, and the connecting pipe is connected with the reference electrode body. The mounting cover and the connecting pipe are arranged in a sealed manner, a hydrogen release box communicated with the reference electrode main body is mounted on the mounting cover, a first guide cylinder opposite to the hydrogen release box is mounted in the reference electrode main body, a connecting thin pipe is mounted at the bottom of the first guide cylinder, and a communicated second guide cylinder is mounted at the bottom of the connecting thin pipe. According to the reversible hydrogen electrode, electrochemical reaction is utilized to produce hydrogen, the hydrogen speed can be adjusted and controlled by controlling the reaction current, the reversible hydrogen electrode is suitable for electrochemical systems with different concentrations, the stability of the reversible hydrogen electrode is enhanced, the hydrogen release box is small, exquisite, safe and portable, and the commercial value of the reversible hydrogen electrode is improved.

The application belongs to the technical field of chemical synthesis, and particularly relates to Pd4S / PVEIB / PPy / GO nanomaterial, a modified electrode thereof and application. The Pd4S / PVEIB / PPy / GO nanomaterial is composed of poly-1-vinyl-3-ethyl imidazole bromide functionalized polypyrrole / graphene oxide carrier and Pd4S particles, and the core is Pd4S intermetallic sulfide phase. Air is used as a reaction gas, and electrochemical nitrogen oxide is used to prepare nitrate in an alkaline electrolyte. Experiments show that, at 1.77 V relative to a reversible hydrogen electrode, the yield and Faraday efficiency of nitrate in an air atmosphere are twice those in a nitrogen atmosphere, and are very stable. The material has mild preparation conditions, and provides a new technical route with high activity and high selectivity for direct air electrocatalytic synthesis of nitrate.

The invention relates to the field of electro-catalytic materials, and mainly discloses a metal-metal catalyst for preparing nitrite through electro-catalytic ammoxidation and a preparation method and application of the metal-metal catalyst, and the catalyst is composed of molybdenum (Mo), nickel (Ni) and copper (Cu) in a metallic state and does not contain an oxide or hydroxide phase. The metal-metal catalyst provided by the invention shows excellent comprehensive performance in electrocatalytic ammoxidation reaction, the catalyst shows extremely low reaction starting potential in the aspect of catalytic activity, and the starting potential is only 1.36 V relative to a reversible hydrogen electrode in electrolyte, so that the energy input required by the reaction is remarkably reduced, and the energy consumption is reduced. Ammonia oxidation can be tested under milder conditions, the safety and reliability of ammonia oxidation are directly improved, efficient ammonia utilization rate and nitrite selectivity are realized, side reaction is effectively inhibited, and the catalyst is particularly remarkable in long-term operation stability.

The invention discloses a copper metal complex for electrocatalytic water oxidation and a preparation method and application thereof, and belongs to the technical field of new materials. The preparation method comprises the following steps: taking an organic ligand of diethylenetriamine and copper perchlorate hexahydrate as raw materials to obtain a copper metal complex; the catalyst shows good catalytic performance in electrocatalytic water oxidation reaction, in an electrochemical test, the catalyst shows good catalytic activity, electrolysis can be carried out for 2 h under the voltage that the current density is 0.2 mA cm <-2 >, the water oxidation starting potential is 1.048 V vs.NHE (vs.NHE is relative to a reversible hydrogen electrode), the voltage reaches 1.586 V vs.NHE when the current density reaches 1 mA cm <-2 >, and the overpotential is 359.7 mV. The method provided by the invention is simple to operate, high in safety, mild in reaction condition and green and environment-friendly in process.

The application discloses a kind of establishment method of electrochemical oxygen removal system and its application.The specific method operation is as follows: silicotungstic acid is dissolved in dilute phosphoric acid solution as cathode electrolyte, anode electrolyte uses the same concentration phosphoric acid solution, and electrochemical reaction is carried out in flow electrolytic cell.The reaction method provided by the application has simple process, low cost, good oxygen removal performance and stability.In 50mL of sealed container, with reversible hydrogen electrode as standard, oxygen content can be reduced to below 5% in 42 minutes at-1.75 volts, and the oxygen removal capacity does not decrease in 1000min of multiple cycles;And when the volume of the container is replaced by 500mL and 3.5L of large volume container, the system can also reduce the oxygen content to below 5% after 4 hours and 26 hours respectively.

The application discloses a PtZn-ZnO catalyst rich in low-potential benzene acid production x The application discloses a catalyst with a PtZn intermetallic compound structure and rich in PtZn-ZnO interface active sites, and a preparation method and application thereof. x The catalyst can significantly promote the oxidation efficiency of biomass-derived alcohol organic small molecules at a low potential (<0.9 V, relative to a reversible hydrogen electrode). x The PtZn-ZnO catalyst is applied to an electrocatalytic benzene methanol oxidation reaction, and benzene methanol can be electrocatalytically oxidized into benzene acid at a low potential of 0.725 V with a selectivity of 99.5%, and the electrocatalytic Faraday efficiency can reach 100%, and the catalyst has high conversion efficiency and excellent product selectivity.

The application provides a single-atom catalyst based on metal organic framework electrochemical reconstruction and a synthesis method and application thereof, the synthesis method comprising: (1) obtaining a carbon-nitrogen base by mixing melamine with conductive carbon black and then heat treating; (2) synthesizing Ni-MOF-74 by a hydrothermal method; and (3) drop-coating the Ni-MOF-74 on the carbon-nitrogen base and using the same for electrocatalytic CO2 reduction, to generate nickel single atoms in situ under constant-voltage electrolysis. The nickel single atom catalyst synthesized in situ at-0.9 V vs. RHE (relative reversible hydrogen electrode) can electrocatalytically reduce CO2 into CO, and the faradic efficiency (FE) of the product can reach 96.4%, the preparation method is simple in process, low in process cost and energy consumption, and can be widely applied to CO2 electrochemical reduction (CER).

The invention belongs to the technical field of electrochemical catalysis, discloses an iron-doped nickel oxide (Fe-NiO) catalyst and application thereof in selective methanol oxidation synthesis of formic acid, and solves the problems of high energy consumption of an anode for hydrogen production by water electrolysis and difficulty in consideration of the performance of an existing catalyst. The catalyst is prepared by taking nickel chloride and ferric chloride as raw materials, adding 0.3 g of urea according to a nickel / iron molar ratio of 3 / 1, dissolving, carrying out ultrasonic treatment, carrying out hydrothermal reaction at 130 DEG C for 3 hours, and carrying out air annealing at 350 DEG C for 3 hours. The methanol oxidation current density of the catalyst reaches 152.8 mA cm <-2 > in a 1M KOH solution containing 1M methanol under 1.6 V (relative to a reversible hydrogen electrode), the current density is still 83.4 mA cm <-2 > after a 24-hour stability test, the formate Faraday efficiency reaches 99.9%, and the current density and the formate Faraday efficiency are both superior to those of a contrast material. The method is low in raw material cost and simple in process, can synchronously realize production of high-value formate and hydrogen, improves the economical efficiency of the whole process, and has a good application prospect.

The invention discloses a preparation method and application of a flaky Cu electrode material, and the preparation method comprises the following steps: S1, dispersing a CuO catalyst into a mixed solution containing isopropanol, perfluorosulfonic acid, tetrahydrofuran and carbon nanotubes, and finally preparing CuO catalyst slurry; and S2, dispensing the slurry on a gas diffusion layer, and carrying out reduction pretreatment to obtain the Cu electrode material. The method has the following beneficial effects that eNO3-RR is carried out in a flowing electrolytic cell by using prepared flaky Cu and commercial blocky Cu as catalysts, a stable fluid field is constructed by using two-dimensional flaky Cu as an electrocatalyst and removing carrier gas in a microfluid flowing electrolytic cell, and the catalytic performance of eNO3-RR can be remarkably improved. In one embodiment of the invention, the eNO3-RR system has relatively high NH3 selectivity and yield of 0.93 mmol cm <-2 > h <-1 > under the potential condition of a relative reversible hydrogen electrode of-0.68 V; when the current density is 900 mAcm <-2 >, the yield of NH3 can reach 3.14 mmol cm <-2 > h <-1 >.

The invention provides a Cu-MOF modified carbon cloth-based BiVO4 photo-anode. The Cu-MOF modified carbon cloth-based BiVO4 photo-anode comprises a carbon cloth substrate, a BiVO4 thin film arranged on the surface of the carbon cloth substrate and a Cu-MOF layer arranged on the surface of the BiVO4 thin film. According to the photo-anode, carbon cloth serves as a flexible substrate, a BiVO4 thin film is prepared on the surface of the carbon cloth through an electro-deposition-annealing process, and then an amorphous Cu-MOF layer formed by cross-linking copper ions and benzene-1, 3, 5-tricarboxylic acid is uniformly deposited on the surface of BiVO4 through a continuous ion layer adsorption and reaction technology. The problems that a traditional rigid substrate is poor in flexibility and weak in interface bonding force are solved. The photocurrent density of the prepared carbon cloth-based BiVO4 / Cu-MOF photoanode under 1.25 V vs and a reversible hydrogen electrode can reach 2.5 mA.cm <-2 >, the photocurrent retention rate after continuous operation is larger than or equal to 90%, and the carbon cloth-based BiVO4 / Cu-MOF photoanode has the flexible and bendable characteristics.

This invention belongs to the field of electrochemical catalysis, specifically relating to a composite nanostructure catalyst and its application in small-molecule electrooxidation-assisted seawater electrolysis for hydrogen production. This application constructs a unique NiCo2Se4 composite nanostructure catalyst modified with vanadium oxide and containing oxygen vacancies and Lewis acid sites, which can be used in small-molecule electrooxidation reactions such as urea oxidation (UOR), methanol oxidation (MOR), and 5-hydroxymethylfurfural oxidation (HMFOR) in seawater environments. It also reveals for the first time the presence of oxygen vacancies (O... v The induced lattice oxygen mechanism (LOM) significantly promotes the formation of N-O bonds, thereby greatly accelerating the formation of NO2 from UOR. ⁻ Based on the reaction kinetics, NiCo2Se4@VO ultimately requires only 1.24 V and 1.40 V relative to a reversible hydrogen electrode (RHE) to achieve 100 and 1000 mA cm⁻¹, respectively. ‑2 It exhibited excellent NO2 ⁻ With selectivity (Faraday efficiency up to 92.77%), it exhibits excellent UOR catalytic performance and long-term service stability.