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ZIF-67-derived N-doped double layer carbon cage as efficient catalyst for oxygen reduction reaction

机译：ZIF-67-derived N-doped double layer carbon cage as efficient catalyst for oxygen reduction reaction

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摘要

The slow kinetic of oxygen reduction reaction (ORR) hampers the practical application of energy conversion devices, such as fuel cells, metal-air batteries. Here, an efficient ORR electrocatalyst consists of Co, Ni co-decorated nitrogen-doped double shell hollow carbon cage (Ni-Co@NHC) was fabricated by pyrolyzing Ni-doped polydopamine wrapped ZIF-67. During the preparation, polydopamine served as a protective layer can effectively prevent the aggregation of Co and Ni nanoparticles during the pyrolysis process, and at the same time forming a carbon layer to grow a double layer carbon cage. This unique hollow structure endows the catalyst with a high specific surface area as well as more exposed active sites. Also benefited from the synergistic effect between Ni and Co nanoparticles, the Ni-Co@NHC catalyst leads to an outstanding ORR performance of half-wave potential (E (1/2), 0.862 V), outperforms that of commercial Pt/C catalyst. Additionally, when Ni-Co@NHC was used in the cathode for the zinc-air battery, the cell exhibits high power density (108 mW cm(-2)) and high specific capacity (806 mAh g(-1)) at 20 mA cm(-2) outperforming Pt/C. This work offers a promising design strategy for the development of high-performance ORR electrocatalysts.

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