期刊
CHEMELECTROCHEM
卷 9, 期 6, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.202101310
关键词
zeolitic imidazolate frameworks; hollow carbon tubes; hierarchical porous structure; Co NPs embedded in N-doping carbon; ORR
资金
- National Natural Science Foundation of China [22076049, 11474101]
- Fundamental Research Funds for the Central Universities of China [D2191120]
A tubular template-assisted strategy was employed to fabricate cobalt nanoparticles embedded in one-dimensional N-doped porous tubular carbon composites. The catalyst exhibited outstanding oxygen reduction reaction performance, superior durability, and tolerance to methanol, making it suitable for zinc-air batteries.
The design and preparation of inexpensive, stable, and superior catalysts for the oxygen reduction reaction (ORR) are significant but challenging towards sustainable energy conversion technologies. Herein, a tubular template-assisted strategy for fabrication of cobalt nanoparticles (Co NPs) embedded in one-dimensional (1D) N-doped porous tubular carbon composites (Co@N-CTs) is developed via in-situ growth of bimetallic zeolitic imidazolate frameworks (ZnCo-ZIFs) on hollow polypyrrole (PPy) nanotubes surface. The PPy can not only act as a hollow tubular template, but also efficiently inhibit aggregation of Co NPs. Thanks to the 1D tubular interconnected networks and abundant micro-/nano- porous tube wall structure, the as-prepared Co@N-CTs catalyst achieves outstanding ORR performance with an onset potential (E-0) of 0.982 V and a half-wave potential (E-1/2) of 0.864 V. Meanwhile, the Co@N-CTs catalyst also demonstrates superior durability with slightly decay of 3 % of initial current over 40000 s, as well as tolerance to the methanol. Furthermore, the Co@N-CTs cathode exhibits a large specific capacity (784 mAh g(-1)) and satisfying power density (116 mW cm(-2)) in a Zn-air battery.
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