Graphitic carbon layer-encapsulated Co nanoparticles embedded on porous carbonized wood as a self-supported chainmail oxygen electrode for rechargeable Zn-air batteries
Graphitic carbon layer-encapsulated Co nanoparticles embedded on porous carbonized wood as a self-supported chainmail oxygen electrode for rechargeable Zn-air batteries
Wenjing Li 1Fang Wang 1Zhengguo Zhang1
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作者信息
1. School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan 750021, PR China
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Abstract
A self-supported chainmail electrocatalyst is developed by embedding graphitic carbon layer-encapsulated Co nanoparticles on N-doped carbonized wood (Co@NCW) as an advanced air cathode for rechargeable Zn-air batteries (ZABs). The NCW with open aligned microchannels facilitates O2 and electrolyte permeation and transportation, while the uniformly distributed graphitic carbon layer-encapsulated Co nanoparticles on NCW featuring fast electron transfer kinetics provide abundant triphase reaction sites for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The Co@NCW exhibits a half-wave potential of 0.89 V vs. reversible hydrogen electrode (RHE) for ORR outperforming the Pt/C (0.85 V vs. RHE) and an overpotential of 410 mV for the OER (10 mA cm~(-2)) comparable to RuO2 (340 mV). A rechargeable ZAB assembled with Co@NCW presents a power density of 47.5 mW cm~(-2) and excellent stability at 5 mA cm~(-2) for 240 h. This work provides an effective strategy to fabricate a practically applicable oxygen electrode for ZABs.
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