期刊
NANOSCALE
卷 12, 期 2, 页码 973-982出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr09020g
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资金
- National Natural Science Foundation of China [21673064, 51802059, 21905070]
- China Postdoctoral Science Foundation [2018M631938, 2018T110307, 2017M621284]
- Heilongjiang Postdoctoral Fund [LBH-Z17074]
- Fundamental Research Funds for the Central Universities
- NSRIF [2019040, 2019041]
Non-noble metal materials are regarded as the most promising catalysts for the oxygen reduction reaction (ORR) to overcome the inherent defects of Pt-based catalysts, like high cost, limited availability and insufficient stability. Here, we fabricate sandwich-like Co encapsulated nitrogen doped carbon polyhedron/graphene (s-Co@NCP/rGO) via a facile and scalable strategy by loading Co-based zeolitic imidazolate framework (ZIF-67) and graphene oxide (GO) layers individually on a polyurethane (PU) sponge template. The 3D sandwich structure is maintained with the assistance of the sponge template, which promotes the uniform dispersion of ZIF-67-derived Co embedded nitrogen doped carbon polyhedra (Co@NCP) and prevents the graphene plates from agglomerating during the annealing process. The final product demonstrates considerable catalytic performance for the ORR with a half-wave potential of 0.85 V, preferable stability and increased poisoning tolerance by comparison to 20 wt% Pt/C, which stems from the 3D sandwich-like structure, N/Co-doping effect, large accessible surface area and hierarchical porous structures. The excellent ORR performance of the catalysts means that they can be utilised in a Zn-air battery as cathode catalysts. During such a demonstration, s-Co@NCP/rGO shows a high open-circuit voltage of 1.466 V, remarkable long-term durability and an outstanding peak power density of 186 mV cm(-2), which shows its high potential as a prospective alternative for widespread practical application in the field of non-noble metal ORR catalysts.
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