期刊
RARE METALS
卷 39, 期 12, 页码 1383-1394出版社
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-020-01581-4
关键词
Bifunctional electrocatalyst; Co3O4; Nitrogen-doped porous carbon; In situ synthesis
资金
- National Natural Science Foundation of China [51871046, 51902046, 51874079, 51571054, 51771046, 51674068]
- Natural Science Foundation of Liaoning Province [201602257]
- Natural Science Foundation of Hebei Province [E2019501097, E2018501091, E2020501004]
- Fundamental Research Funds for the Central Universities [N182304017, N182304015, N172302001, N172304044]
The rational exploitation of non-precious metal catalyst with high activity, strong durability and low cost for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is of vital importance for metal-air batteries. Herein, a composite of Co3O4 nanoparticles confined in three-dimensional (3D) N-doped porous carbon (Co-NpCs) was prepared by a simple freeze-drying and in situ pyrolysis method. The effect of different dosages of Co(NO3)(2) on the catalytic performance was discussed. The Co-NpC-12% exhibits the best catalytic performance (E-1/2 = 0.78 V, better stability than 20% Pt/C) in ORR and in OER among all the as-synthesized samples. Furthermore, it also exhibits the best bifunctional activity (Delta E = 0.849 V). The excellent properties of Co-NpCs are mainly due to the synergy between Co(3)O(4)and carbon. Firstly, a high Co3O4 loading amount can boost the defect level of the N-doped hierarchical porous carbon and expose more active sites. Secondly, the unique in situ pyrolysis guarantees a large-area contact between Co3O4 and carbon as well as a strong C-O-Co bonding, which promotes charge transfer, avoids the peeling of Co3O4 nanoparticles and effectively improves the stability of the material. This work is expected to offer a feasible strategy to produce metal oxide/carbon nanocomposite and push forward the development of bifunctional electrocatalyst with high activity and stability.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据