期刊
JOURNAL OF POWER SOURCES
卷 490, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2021.229570
关键词
Zn-air battery; Bifunctional oxygen electrocatalyst; N-doped carbon; Nanoparticle; Cobalt nitride
资金
- National Natural Science Foundation of China [201902051]
- Fujian Provincial Key Science and Technology Program of China [2019H0013]
- Quanzhou City Science and Technology Program of China [2018C079R]
- Innovative Fund of Huaqiao University [18013081030]
The synthesis of Co@NC by utilizing a triazine-containing poly(Schiff-base) as nitrogen-rich precursor resulted in an efficient bifunctional electrocatalyst with cobalt nanoparticles impregnated in a porous carbon matrix. Co@NC exhibited remarkable catalytic activities for both ORR and OER, with a low overpotential gap, high surface area, peak power density, and specific capacity, as well as superior long-term cycling stability, attributed to the unique impregnated structure with sufficient accessible active sites.
Designing transition metal and nitrogen co-doped carbon as efficient oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) bifunctional electrocatalysts is pivotal for rechargeable zinc-air batteries. Herein, a triazine-containing poly(Schiff-base) has been synthesized and used as the nitrogen-rich precursor to prepare Co/Co2N modified nitrogen-doped porous carbon (Co@NC). The formed cobalt nanoparticles are impregnated in the porous carbon matrix with an intermediary layer of catalytically active Co2N. Co@NC exhibits a specific surface area of 2513 m(2) g(-1) and remarkable bifunctional catalytic activities with a low gap of 0.76 V between ORR and OER overpotentials. The Co@NC-based battery possesses a peak power density of 141.6 mW cm(-2), a specific capacity of 776 mAh g(-1) and superior long-term cycling stability, stemmed from the unique impregnated structure with sufficient accessible active sites.
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