Mechanisms and coping strategies on deactivation of anode catalysts for direct methanol fuel cells
Among many factors determining the performance and cost of direct methanol fuel cells(DMFC),methanol oxidation electrocatalyst is the most crucial one.At present,platinum-based catalysts are considered to be the most promising and efficient for methanol oxidation reaction.However,during the reaction process,there are deactivation problems caused by the agglomeration and leaching of active sites,poor anti-CO toxicity,and the corrosion and collapse of the support,which hinder the commercialization of DMFC.How to improve the stability of anode catalyst for DMFC is an urgent problem to be solved.Firstly,the principle and catalytic mechanism of methanol electrooxidation are summarized in this review.Then,the deactivation mechanisms of anode catalysts were reviewed in detail,and the effective methods to solve the deactivation issues were discussed.Finally,it was pointed out that using the confinement to restrict metal migration and aggregation,the construction of multi-alloy,the design of composite support,and combining the theoretical research with the in situ characterization technique,which were the main research directions of the development of higher and more stable anode catalysts in the future.
direct methanol fuel cellanode catalystinactivation mechanismmigration agglomeration and leaching of metal particlessupport corrosion and collapse
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