42results about How to "Increase ORR activity" patented technology

A polymetallic nanoparticle alloy having enhanced catalytic properties including at least one noble metal and at least one base metal, where the noble metal is preferentially dispersed near the surface of the nanoparticle and the base metal modifies the electronic properties of the surface disposed noble metal. The polymetallic nanoparticles having application as a catalyst when dispersed on a carbon substrate and in particular applications in a fuel cell. In various embodiments a bimetallic noble metal-base metal nanoparticle alloy may be used as an electrocatalyst offering enhanced ORR activity compared to the monometallic electrocatalyst of noble metal.

The invention relates to a negative expansion material compounded cobalt-based perovskite material, a preparation method and a solid oxide fuel cell, and belongs to the technical field of fuel cells. According to the invention, the negative expansion material is introduced into the cobalt-based perovskite oxide, so that the SOFC cathode material with good electrochemical performance and low thermal expansion is successfully prepared. A composite electrode achieves good mechanical tolerance in the SOFC, the volume change in the whole sintering process can be relieved, the composite electrode is stably transited to a high-temperature stage, the TEC of the composite electrode is only 12.9 * 10 <-6 > K <-1 >, and the composite electrode is completely matched with an SDC electrolyte; in addition, the composite material shows good ORR activity and TEC value, and meanwhile, the CO2 poisoning resistance of the composite material is very excellent.

The invention discloses a preparation method for a nitrogen-boron-doped carbon-based catalyst, which belongs to the technical field of catalytic materials. The method comprises the following steps: pretreating a carbon material; then mixing the pretreated carbon material with a nitrogen supplying agent, a boron supplying agent and an activator and carrying out mechanical ball milling; then subjecting a mixture obtained after ball milling to nitrogen-boron co-penetration heat treatment of the carbon material at a temperature of 500 to 1100 DEG C under the protection of inert gas for 1 to 3 h; and finally carrying out pickling so as to prepare the nitrogen-boron-doped carbon-based catalyst. The nitrogen-boron-doped carbon-based catalyst prepared by using the method can be used as a negative electrode oxygen reducing catalyst for a fuel cell; the preparation method has the advantages of low prices of raw materials, simple process, low requirements on equipment and applicability to large-scale production of the catalyst; and the catalyst shows good oxygen reduction activity and stability under both acidic and alkaline conditions.

Catalyst comprising graphitic carbon and methods of making thereof; said graphitic carbon comprising a metal species, a nitrogen-containing species and a sulfur containing species. A catalyst for oxygen reduction reaction for an alkaline fuel cell was prepared by heating a mixture of cyanamide, carbon black, and a salt selected from an iron sulfate salt and an iron acetate salt at a temperature of from about 700° C. to about 1100° C. under an inert atmosphere. Afterward, the mixture was treated with sulfuric acid at elevated temperature to remove acid soluble components, and the resultant mixture was heated again under an inert atmosphere at the same temperature as the first heat treatment step.

The invention discloses a kind of Mn 5 O 8 Nano cage oxygen reduction electrocatalyst and preparation method thereof. The MnO nanoflower-like material with coexistence of cubic crystal system and orthorhombic crystal system and containing oxygen vacancies is generated in situ by electrochemical reduction reaction. 5 O 8 Nano-caged oxygen reduction electrocatalyst, wherein the Mn 5 O 8 The nano-cage oxygen reduction electrocatalyst is monoclinic and presents a nano-cage structure formed by stacking nanosheets.

The invention discloses a porous concave cubic CoNP@CoSA-N-C catalyst and its preparation method and application. The invention firstly prepares a ZnCo-ZIF cube with a size of about 200-400nm, and then wraps the ZnCo-ZIF cube on the surface of the cube. Covered with mesoporous silica coating to prepare ZnCo‑ZIF@mSiO 2 nanocubes; calcined at 700‑1000 °C in an inert gas environment, and then the silica layer was etched away to form porous concave cubic Co single-atom catalysts (Co SA ‑N‑C). In the second step, the organometallic gaseous sublimation doping method is used to increase the metal content, and the Co SA On the ‑N‑C carbon substrate, cobalt acetylacetonate is first evaporated at low temperature, then captured, then reduced at high temperature and stabilized on Co SA ‑N‑C carbon matrix, and finally synthesized a high-content Co metal catalyst. Simultaneous generation of highly active Co nanoparticles and Co‑N 4 Composite site (Co NP @Co SA ‑N‑C). The invention greatly improves the activity of the catalyst.

The invention relates to a method for preparing a high-performance carbon catalyst, and belongs to the technical field of new energy materials. The method comprises the following steps: firstly, carrying out coordination on aniline and a transition metal salt to prepare a suspension liquid; secondly, filtering the prepared suspension liquid to obtain a filter cake, soaking the filter cake with a mixed solution of one or more of ethanol, water, acetone, diethyl ether, methyl alcohol and formaldehyde at any ratio for 15-120 minutes, cleaning the filter cake and then carrying out suction filtration, drying and grinding to obtain a nano dentate polyaniline metal coordination polymer; and finally carrying out thermal treatment on the obtained nano dentate polyaniline metal coordination polymer to prepare the high-performance carbon catalyst under an atmosphere condition. A non-noble metal carbon catalyst prepared by the method is low in price of used raw materials, simple in preparation technology, low in equipment requirement and suitable for large-scale production of the catalyst.

The invention belongs to the technical field of environmental protection water treatment and biological fuel cells, and provides a serial continuous flow microbial fuel cell system and preparation thereof in order to improve the limitation of nitrobenzene degradation rate of a single microbial fuel cell and improve the salinity of organic matter and power generation. The method and its application in degrading nitrobenzene wastewater are composed of two double-chamber microbial fuel cells MFC1 and MFC2. The anodes of MFC1 and MFC2 are left standing separately, and the cathodes are connected in series; the anode chamber and the cathode chamber are separated by an ion exchange membrane. On, the electrodes in the anode compartment and cathode compartment of MFC1 and MFC2 are Fe@Fe 2 O 3 / PANI / PEG modified carbon felt; a saturated calomel electrode is set in the cathode chamber as a reference electrode; the anode and cathode are connected to an external resistance of 1000Ω through copper wires to form a complete circuit loop, and a voltage collector is connected in parallel with the external resistance. The electron transfer and the mass transfer and throughput of the system are improved, and the performance and efficiency are improved.

The invention relates to the technical field of material chemistry, and particularly discloses a preparation method of a monodisperse platinum-series high-entropy alloy nanoparticle catalyst. The preparation method comprises the steps: preparing a silicon dioxide photonic crystal template, preparing a carbon precursor solution, and dissolving a platinum precursor and at least four other metal precursors in THF and CHCl3 to obtain a mixed solution; mixing a block copolymer F127, a carbon precursor solution and tetraethyl orthosilicate, respectively adding the mixture and a protonic acid solution into the mixed solution, and stirring to obtain a transparent solution; adding the transparent solution into the silicon dioxide photonic crystal template, drying, heating and curing to obtain a purple brown solid; calcining the purple brown solid to obtain a gray solid; and etching the gray solid by adopting strong base or strong acid, filtering and drying. The monodisperse platinum-series high-entropy alloy nanoparticle catalyst with the advantages of controllable particle size, good dispersity, excellent performance and the like is obtained by adopting the preparation method disclosed bythe invention.

The invention provides a polyimide-based catalytic cathode carbon membrane loaded with a single-atom catalyst and its application. Using the principle of MOF-based in-situ derivation of a single-atom catalyst, polyimide is used as the precursor of the carbon membrane, and the prepared Mix and disperse the MOF precursor and conductive nanomaterials in an organic solvent, then add the above solution into the polyamic acid solution, and scrape-coat the MOF polyamic acid hybrid film on a glass plate; finally, use the temperature programming method in the inert Carbonization is carried out in a gas atmosphere. During the carbonization process, the metal ions in the MOF are pyrolyzed in situ and reduced to single-atom catalysts. The polyamic acid is first converted into polyimide and then further forms a carbon film. The invention prepares a conductive cathode catalytic membrane with high mechanical properties, chemical corrosion resistance, high stability and high ORR activity. It is used in EMBR system, microbial fuel cell system, and electrocatalytic system, and is suitable for membrane treatment of high-concentration refractory organic industrial wastewater.

The invention relates to a FeCx@NC core-shell structured catalyst and a preparation method therefor. The FeCx@NC core-shell structured catalyst takes iron and FeCx nanoparticle mixture as the core, and takes nitrogen and FeCx-doped carbon as the shell, and has a mesoporous structure with a specific surface area of 500-900m<2>g<-1>. The preparation method for the core-shell structured catalyst comprises the steps of preparing a polyaniline and glucose composite material firstly; performing calcining for one time to prepare a Fe-N-C catalyst; and finally performing calcining for the second time to obtain the FeCx@NC catalyst. The catalyst is high in oxygen reduction activity and high in stability; the raw materials, such as the carbon source and the nitrogen source used by the preparation method are low in cost, so that the production cost for producing a Fe-N-C material by the conventional pyrolysis method can be lowered; meanwhile, the preparation method is simple and easy to implement; and in addition, the core-shell structured catalyst provided by the invention has relatively high electrocatalytic activity, and can be widely applied to the negative electrode catalyst of a proton exchange membrane fuel cell, an alkali negative ion exchange membrane fuel cell, and a metal air battery.

An N, S co-doped metal-free CNS oxygen reduction catalyst and a preparation method thereof belong to the technical field of energy materials and electrochemistry. The present invention uses glucose as carbon source, with g-C 3 N 4 As nitrogen source and soft template agent, polysulfide as sulfur source, three-dimensional porous carbon material catalyst was synthesized by hydrothermal-calcination two-step method. The obtained CNS catalyst is a three-dimensional porous graphene-like structure, and the surface contains a large number of pore structures. The ORR of the catalyst has an initial potential of 1.01V and a half-wave potential of 0.88V in an alkaline electrolyte, which is higher than that of a commercial Pt / C catalyst. Good catalytic performance. The invention has a large number of channels, which can expose more active sites, which is conducive to the transmission of ORR reaction substances and the improvement of the ORR catalytic activity of the material; the selected reagent has low toxicity, wide source of raw materials, low cost, and the preparation process is simple and convenient. Green and pollution-free, easy to scale up production, and conducive to large-scale application; it can be used in acidic and alkaline primary and secondary batteries involving ORR, such as fuel cells and metal-air batteries.