CoFe-CoxN heterojunction encapsulated by lignin-derived nitrogen-doped biochar as bifunctional oxygen electrocatalysts for zinc-air batteries

被引:18
作者
Zhang, Jinhui [1 ]
Liu, Jianglin [1 ]
Liu, Bowen [1 ]
Lin, Xuliang [1 ]
Qin, Yanlin [1 ]
机构
[1] Guangdong Univ Technol, Sch Chem Engn & Light Ind, Guangdong Prov Key Lab Plant Resources Biorefinery, Guangzhou 510006, Guangdong, Peoples R China
基金
中国国家自然科学基金;
关键词
Lignin-derived carbon; Heterojunction; Oxygen evolution reaction; Oxygen reduction reaction; Zinc-air battery; CARBON NANOTUBES; REDUCTION; FACILE;
D O I
10.1016/j.ces.2023.119049
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The development of low-cost and efficient bi-functional electrocatalysts are still the main challenging for oxygen reduction reactions (ORR) and oxygen evolution reactions (OER) in zinc-air batteries. In this work, CoFe-CoxN heterojunction nanocatalyst encapsulated by N-doped biochar was synthesized by combining carboxylated lignin with metal ions via self-assembly and in situ pyrolysis reduction. The heterojunction endowed the superior oxygen electrocatalytic performance, and the carbon-encapsulated structure improved the stability and corrosion resistance in electrolyte. It exhibited a positive half-wave potential of 0.79 V for ORR and a low overpotential of 404 mV at 10 mA cm(-2) for OER. The corresponding zinc-air battery displayed a high-power density of 178 mW.cm(-2) and excellent stability. DFT calculation indicated that the existence of CoFe-CoxN and the N-doped carbon layer could improve the electron transfer efficiency. This study demonstrated a viable and eco-friendly design for alloy and nitride heterojunction electrocatalysts for energy conversion by using lignin-metals complex.
引用
收藏
页数:9
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