Статья

Catalysis stability enhancement of Fe/Co dual-atom site via phosphorus coordination for proton exchange membrane fuel cell

Yinuo WangSchool of Materials Science and Engineering, Beihang University, Beijing, 100081, ChinaXin WanSchool of Materials Science and Engineering, Beihang University, Beijing, 100081, ChinaJieyuan LiuSchool of Materials Science and Engineering, Beihang University, Beijing, 100081, ChinaWenwen LiSchool of Materials Science and Engineering, Beihang University, Beijing, 100081, ChinaYongcheng LiQinghai Provincial Key Laboratory of New Light Alloys, Qinghai Provincial Engineering Research Center of High-Performance Light Metal Alloys and Forming, Qinghai University, Xining, 810016, ChinaXu GuoSchool of Materials Science and Engineering, Beihang University, Beijing, 100081, ChinaXiaofang LiuSchool of Materials Science and Engineering, Beihang University, Beijing, 100081, ChinaJiaxiang ShangSchool of Materials Science and Engineering, Beihang University, Beijing, 100081, ChinaJianglan ShuiSchool of Materials Science and Engineering, Beihang University, Beijing, 100081, China

2021en

ABI

Аннотация

Non-precious metal catalysts (NPMCs) are promising low-cost alternatives of Pt/C for oxygen reduction reaction (ORR), which however suffer from serious stability challenge in the devices of proton-exchange-membrane fuel cells (PEMFC). Different from the traditional strategies of increasing the degree of graphitization of carbon substrates and using less Fenton-reactive metals, we prove here that proper regulation of coordination anions is also an effective way to improve the stability of NPMC. N/P co-coordinated Fe-Co dual-atomic-sites are constructed on ZIF-8 derived carbon support using a molecular precursor of C34H28Cl2CoFeP2 and a “precursor-preselected” method. A composition of FeCoN5P1 is infered for the dual-atom active site by microscopy and spectroscopy analysis. By comparing with N-coordinated references, we investigate the effect of P-coodination on the ORR catalysis of Fe-Co dual-atom catalysts in PEMFC. The metals in FeCoN5P1 have the lower formation energy than those in the solo N-coordinated active sites of FeCoN6 and FeN4, and exhibits a much better fuel cell stability. This anion approach provides a new way to improve the stability of dual-atom catalysts.

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Идентификаторы

DOI: 10.1007/s12274-021-3966-y

Цитирования и источники

Цитирований: 2Использованных источников: 0

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