| Since the first industrial revolution,the important role of energy has become increasingly prominent.With the continuous development of science and technology,the reserves of traditional fossil energy are no longer sufficient,and the emergence of new energy has its historical inevitability.Fuel cells are the most deeply and widely studied new energy sources.Among them,the micro direct methanol fuel cell(DMFC)has become the leader in new energy because of its low working temperature,friendly environment,long life and high specific energy.However,due to the shortcomings of platinum-carbon catalyst with miniature DMFC cathode,such as high cost,low methanol resistance and easy reaction with methanol to produce carbon monoxide poisoning,the marketization of DMFC is seriously restricted.In this paper,the problems of commercial cathode catalysts for DMFC were studied.The idea of using non-noble metal catalysts(Fe-N-C catalysts)to construct micro-DMFC cathode catalytic layer was proposed,and the problem of flooding was solved.Some research results were obtained.Firstly,the synthesis and preparation process of Fe-N-C catalyst based on polyaniline was proposed,and a non-platinum catalyst with high oxygen reduction activity was obtained.Then,the pore structure of Fe-N-C catalyst was improved by ammonia etching,and it was successfully applied in micro DMFC with high output characteristics.By means of physical and chemical analysis,the catalysts before and after ammonia etching were characterized,and convincing experimental conclusions were obtained.Finally,by introducing hydrophobic materials and methanol vapor supply,water management of cathodic catalytic layer of micro DMFC was studied,and a fuel cell with higher performance was obtained.The performance of the micro DMFC cathode catalyst studied in this paper is excellent.The ammonia etching method can improve the performance of the micro DMFC obviously.The performance of the micro DMFC improved by water management research has been improved. |
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