2LaCo0.7Fe0.3O3/N-doped carbon bifunctional electrocatalyst derived from g-C3N4 nanosheets for zinc-air battery

被引:13
作者
Liu, Haoquan [1 ]
Ren, Xinghui [1 ]
Bai, Haoyang [2 ]
Qiao, Huici [1 ,2 ]
Lu, Jinwei [2 ]
Wang, Xuefei [2 ]
Huang, Hao [1 ]
Hu, Jie [1 ,2 ]
机构
[1] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, West Hebei St 438, Qinhuangdao 066004, Peoples R China
[2] Yanshan Univ, Sch Environm & Chem Engn, Hebei Key Lab Heavy Met Deep Remediat Water & Reso, West Hebei St 438, Qinhuangdao 066004, Peoples R China
基金
中国国家自然科学基金;
关键词
Perovskite; Electrocatalyst; Zn-air battery; N-doped carbon; DFT calculation; OXYGEN REDUCTION REACTION; EFFICIENT ELECTROCATALYST; PEROVSKITE OXIDES; SITE; NANOCRYSTALS; PERFORMANCE; HYBRIDS; ROBUST;
D O I
10.1016/j.electacta.2022.140211
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Perovskite oxides have been widely studied as one of the excellent bifunctional oxygen electrocatalysts (ORR: Oxygen Reduction Reaction, OER: Oxygen Evolution Reaction) due to its flexible crystal structure and low cost. Herein, 2LaCo(0.7)Fe(0.3)O(3)/N-doped carbon is prepared by sol-gel method using g-C3N4 nanosheets as carbon source and nitrogen source. The LaCo0.7Fe0.3O3 nanoparticles have excellent dispersibility on the N-doped carbon substrate and the composite material has higher oxygen vacancy concentration, showing enhanced bifunctional electrocatalytic activity (?E=Ej=10,OER-E1/2,ORR=1.03 V) compared with the original LaCo0.7Fe0.3O3 (?E = 1.12 V). Moreover, 2LaCo(0.7)Fe(0.3)O(3)/N-doped carbon-based Zn-air battery presents excellent cycling stability (over 24 h) and high peak power density of 116 mW cm-2. Density functional theory (DFT) calculations revealed the mechanism of improvement electrocatalytic activity of 2LaCo(0.7)Fe(0.3)O(3)/N-doped carbon, which comes from the regulated electronic structure, including enhanced conductivity and the covalence of Co-O bond, reducing the free energy change of rate-determining step. This study provides a novel strategy for the design and prepare perovskite-type bifunctional electrocatalysts.
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页数:10
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