In-situ grafting of CoO nanosheets onto hollow Co-N-C matrix for an enhanced bifunctional oxygen electrocatalyst

被引:0
|
作者
Gan, Lang [1 ,3 ]
Han, Linhu [1 ]
Liu, Jincheng [1 ]
Li, Jiawang [1 ]
Jiang, Chenmeng [1 ]
Zhao, Jing [1 ]
Chen, Kang [1 ]
Jiang, Dapeng [1 ]
Ren, Yanjie [2 ]
机构
[1] Changsha Univ Sci & Technol, Sch Energy & Power Engn, Key Lab Efficient & Clean Energy Utilizat, Changsha 410111, Peoples R China
[2] Zhejiang Univ Sci & Technol, Sch Mech & Energy Engn, Hangzhou 310023, Peoples R China
[3] Shenzhen Univ, Inst Microscale Optoelect, Int Collaborat Lab 2D Mat Optoelect Sci & Technol, Minist Educ, Shenzhen 518060, Peoples R China
基金
中国国家自然科学基金;
关键词
Oxygen reduction reaction; Oxygen evolution reaction; Zinc -air battery; Heterojunction; CATALYST; GRAPHENE;
D O I
10.1016/j.jelechem.2024.118503
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The pursuit of efficient non-noble metal electrocatalysts for zinc-air batteries continues to pose a significant challenge. Herein, we introduce a novel, efficient approach to create a robust interface bond between CoO and a Co-N-C matrix that stemming from the self-polymerization of ZIF-67. The optimized catalyst displays remarkable electrocatalytic activity for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), as well as in zinc-air battery applications. The active CoO decorating the Co-N-C matrix surface reduces the ORR half-wave-potential by approximately 70 mV, resulting in an onset ORR potential of 0.89 V (vs. reversible hydrogen electrode, RHE), a half-wave potential of 0.79 V (vs. RHE), and an OER overpotential of 400 mV at a current density of 10 mA cm-2 in 0.1 M KOH. Furthermore, the CoO@Co-N-C catalyst-powered zincair battery demonstrates minimal variations in charging and discharging processes after 210 cycles at 50 mA cm-2. This outstanding electrocatalytic performance can be attributed to the unique hollow heterojunction structure and the synergistic interplay between the surface-active CoO and the porous Co-N-C matrix.
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收藏
页数:7
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