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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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