Catalysis stability enhancement of Fe/Co dual-atom site via phosphorus coordination for proton exchange membrane fuel cell
| Autor: | Yinuo Wang, Jianglan Shui, Xu Guo, Jia-Xiang Shang, Wenwen Li, Jieyuan Liu, Xin Wan, Xiaofang Liu, Yongcheng Li |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
biology Phosphorus chemistry.chemical_element Active site Proton exchange membrane fuel cell Condensed Matter Physics Atomic and Molecular Physics and Optics Ion Catalysis chemistry Chemical engineering Atom biology.protein General Materials Science Electrical and Electronic Engineering Spectroscopy Carbon |
| Zdroj: | Nano Research. 15:3082-3089 |
| ISSN: | 1998-0000 1998-0124 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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