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Regulating local coordination environment of mg-co single atom catalyst for improved direct methanol fuel cell cathode

引用

Journal of Magnesium and Alloys 2023年第6期11卷 1959-1969页

作者： Kaiwen Wang Hanjun Zou Jiazhi Meng Chaogang Ban Xue Liu Jiangping Ma cong Wang Liyong Gan Xiaodong Han Xiaoyuan Zhou college of Physics and Center of Quantum Materials and Devices Chongqing UniversityChongqing 401331China Beijing Key Laboratory of Microstructure and Property of Advanced Materials Beijing University of TechnologyBeijing 100024China Institute of Emerging Energy Storage Materials and Equipment Chongqing 401135China Analytical and Testing Center Chongqing UniversityChongqing 401331China

Fuel cells operated with a reformate fuel such as methanol are promising power systems for portable electronic devices due to their high safety,high energy density and low pollutant ***,several critical issues including methanol crossover effect,co-tolerance electrode and efficient oxygen reduction electrocatalyst with low or non-platinum usage have to be addressed before the direct methanol fuel cells(DMFCs)become commercially available for industrial ***,we report a highly active and selective mg-co dualsite oxygen reduction reaction(ORR)single atom catalyst(SAC)with porous n-doped carbon as the *** catalyst exhibits a commercial Pt/C-comparable half-wave potential of 0.806 V(versus the reversible hydrogen electrode)in acid media with good ***,practical DMFCs test achieves a peak power density of over 200 m W cm^(-2)that far exceeds that of commercial Pt/C counterpart(82 m W cm^(-2)).Particularly,the mg-co DMFC system runs over 10 h with negligible current loss under 10 M concentration methanol work *** results and theoretical calculations reveal that the n atom coordinated by mg and co atom exhibits an unconventional d-band-ditto localized p-band and can promote the dissociation of the key intermediate*OOH into*O and*OH,which accounts for the near unity selective 4e-ORR reaction pathway and enhanced ORR *** contrast,the n atom in SAC–co remains inert in the absorption and desorption of*OOH and**** local coordination environment regulation strategy around active sites may promote rational design of high-performance and durable fuel cell cathode electrocatalysts.

关键词： Single atom catalyst mg−n−co DMFC Cathode

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