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Preparation method of atomic dispersion non-noble metal fuel battery cathode catalyst

A fuel cell cathode and non-precious metal technology, applied in the field of electrochemical catalysis, to achieve the effect of simple and practical method, excellent catalytic activity and high stability

Active Publication Date: 2017-11-21
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the preparation of catalysts with uniform dispersion of active sites and avoiding self-agglomeration during the catalytic process, and there are even fewer catalysts with high activity and stability in acidic media.

Method used

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  • Preparation method of atomic dispersion non-noble metal fuel battery cathode catalyst
  • Preparation method of atomic dispersion non-noble metal fuel battery cathode catalyst
  • Preparation method of atomic dispersion non-noble metal fuel battery cathode catalyst

Examples

Experimental program
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Effect test

Embodiment example 1

[0029] Weigh 0.0015mol of alginate and dissolve it in water at 80°C. After forming a uniform and transparent solution, add 0.006mol of FeCl 3 Iron salt, forming a flocculent chelate. After stirring for 10 hours, add 0.006mol of nitrogen precursor ethylenediamine, stir for another 48 hours, and then evaporate to dryness in an open container to obtain a powdery catalyst, and then put it into a tube Carry out heat treatment in the furnace at 700°C, feed nitrogen as a protective gas, heat up at a rate of 5°C / min, keep warm for 2 hours, take it out and put it in 0.5M sulfuric acid for pickling at 100°C for 12 hours, take it out and vacuum dry it for 12 hours , and then put it into the furnace and heat-treat as above to obtain the final catalyst.

Embodiment example 2

[0031] Weigh 0.099mol of alginate and dissolve it in water at 50°C. After forming a uniform transparent solution, add 0.006mol of Co(NO3 ) 3 Salt, forming a flocculated chelate, after stirring for 10 hours, add 0.198mol of nitrogen precursor cyanamide, stir for another 48 hours, and then evaporate to dryness in an open container to obtain a powdery catalyst, which is then placed in a tube furnace Carry out heat treatment at 1200°C, feed nitrogen as a protective gas, heat up at a rate of 10°C / min, keep warm for 5 hours, take it out and put it in 0.5M sulfuric acid for pickling at 100°C for 24 hours, take it out and vacuum dry it for 10 hours, then Then put it into the furnace and heat-treat as above to obtain the final catalyst.

Embodiment example 3

[0033] Weigh 0.05025mol of alginate and dissolve it in water at 30°C. After forming a uniform and transparent solution, add 0.006mol of Fe(NO 3 ) 3 Iron salt forms a flocculent chelate. After stirring for 10 hours, add 0.102mol of nitrogen precursor dicyandiamide, stir for another 48 hours, and then evaporate to dryness in an open container to obtain a powdery catalyst, which is then placed in a tube Carry out heat treatment in the furnace at 1200°C, feed nitrogen as a protective gas, heat up at a rate of 5°C / min, keep warm for 2 hours, take it out and put it in 0.5M sulfuric acid for pickling at 100°C for 12 hours, take it out and vacuum dry it for 12 hours , and then put it into the furnace and heat-treat as above to obtain the final catalyst.

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Abstract

The invention belongs to the field of electrochemistry catalysis, and discloses a preparation method of an atomic dispersion non-noble metal fuel battery cathode catalyst. The method comprises the following steps: (a) heating and dissolving alginate into an alginate solution, keeping a heating temperature, adding metal salts into the alginate solution, and generating an alginate chelate solution; (b) adding organic nitride into the alginate chelate solution, enabling the organic nitride and the alginate chelate solution to react, and drying a product after reaction by steaming to obtain a powdered compound; and (c) successively performing primary heat treatment, acid pickling and secondary heat treatment on the powdered compound, thus obtaining the needed catalyst. By virtue of the preparation method, the catalyst with high activity in an acid medium is prepared, and active sites are uniformly dispersed and fixed, so that the preparation method is easy in control and regulation and suitable for large-scale production and application.

Description

technical field [0001] The invention belongs to the field of electrochemical catalysis, and more specifically relates to a method for preparing an atomically dispersed non-noble metal fuel cell cathode catalyst. Background technique [0002] Oxygen reduction reaction (acidic solution O 2 +4H + +4e - →H 2 O, alkaline solution O 2 +2H 2 O+4e - →4OH - ) is an important reaction for the development of fuel cells to obtain clean energy research, and is currently the biggest obstacle hindering the commercialization of fuel cells. Compared with the oxygen evolution reaction of the anode, the kinetics of oxygen reduction is slow. At present, only a series of noble metals and noble metal alloys can effectively catalyze the cathodic oxygen reduction reaction. However, noble metals have outstanding problems such as high price, limited resources, and insufficient stability, which hinder the commercial development of proton exchange membrane fuel cells. From this perspective, for...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCH01M4/9008Y02E60/50
Inventor 李箐苗政培
Owner HUAZHONG UNIV OF SCI & TECH
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