期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 33, 页码 29708-29717出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b04648
关键词
oxygen reduction reaction; integrated cathode; plasma etching; N-doping; zinc-air batteries
资金
- National Natural Science Foundation of China [21776119, 21376113]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [SJKY19_1994]
- Innovation & Practice Fund for College Students in the Industrial Center of Jiangsu University [ZXJG2018066]
In order to reduce the charge-transfer resistance, ohmic resistance, and ionic and electronic resistances arising from the polymer binder, designing and constructing self-standing and binder-free porous electrodes are very significant for energy storage and conversion devices. Herein, self-standing and binder-free porous N-Co carbon nanofiber (N-Co/CNF) cathodes are prepared for zinc-air batteries (ZABs) by an in situ electrospinning/plasma-etching method. The morphology and activity of the prepared electrodes are investigated by several characterization techniques. The prepared specimens exhibit a multilayered CNF structure, and a new CoN compound is produced after plasma-etching treatment. The N-Co/CNF-300-10 cathode demonstrates excellent electrocatalytic performance toward oxygen reduction reaction, with an onset potential and a half-wave potential of 0.995 and 0.853 V (vs reversible hydrogen electrode), respectively, which is comparable to that of 20% Pt/C. The N-Co/CNF-300-10 cathode acting as a self-standing electrode for ZABs exhibits a maximum discharge power density as high as 229 mW cm(-2) and a specific capacity of 659.6 mA h g(zn)(-1), which are much higher than those of the commercial catalysts, benefiting from the self-standing porous structure, N-doping, and more defects and active sites induced by plasma-etching. It provides an effective way to construct a self-standing porous electrode with controllable compositions for rechargeable metal-air batteries.
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