Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/159673
Title: Understanding the synergistic effects of cobalt single atoms and small nanoparticles: enhancing oxygen reduction reaction catalytic activity and stability for zinc-air batteries
Authors: Wang, Zhe
Zhu, Chao
Tan, Hua
Liu, Jan
Xu, Lulu
Zhang, Yongqi
Liu, Yipu
Zou, Xiaoxin
Liu, Zheng
Lu, Xuehong
Keywords: Engineering::Materials
Issue Date: 2021
Source: Wang, Z., Zhu, C., Tan, H., Liu, J., Xu, L., Zhang, Y., Liu, Y., Zou, X., Liu, Z. & Lu, X. (2021). Understanding the synergistic effects of cobalt single atoms and small nanoparticles: enhancing oxygen reduction reaction catalytic activity and stability for zinc-air batteries. Advanced Functional Materials, 31(45), 2104735-. https://dx.doi.org/10.1002/adfm.202104735
Project: NRF-CRP22-2019-0007 
NRF-CRP21-2018-0007
MOE2019-T2-2-105
RG7/18
RG161/19
Journal: Advanced Functional Materials
Abstract: The development of earth-abundant oxygen reduction reaction (ORR) catalysts with high catalytic activity and good stability for practical metal-air batteries remains an enormous challenge. Herein, a highly efficient and durable ORR catalyst is reported, which consists of atomically dispersed Co single atoms (Co-SAs) in the form of Co-N4 moieties and small Co nanoparticles (Co-SNPs) co-anchored on nitrogen-doped porous carbon nanocage (Co-SAs/SNPs@NC). Benefiting from the synergistic effect of Co-SAs and Co-SNPs as well as the enhanced anticorrosion capability of the carbon matrix brought by its improved graphitization degree, the resultant Co-SAs/SNPs@NC catalyst exhibits outstanding ORR activity and remarkable stability in alkaline media, outperforming Co-SAs-based catalyst (Co-SAs@NC), and benchmark Pt/C catalyst. Density functional theory calculations reveal that the strong interaction between Co-SNPs and Co-N4 sites can increase the valence state of the active Co atoms in Co-SAs/SNPs@NC and moderate the adsorption free energy of ORR intermediates, thus facilitating the reduction of O2. Moreover, the practical zinc-air battery assembled with Co-SAs/SNPs@NC catalyst demonstrates a maximum power density of 223.5 mW cm–2, a high specific capacity of 742 W h kg–1 at 50 mA cm–2 and a superior cycling stability.
URI: https://hdl.handle.net/10356/159673
ISSN: 1616-301X
DOI: 10.1002/adfm.202104735
Schools: School of Materials Science and Engineering 
School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
Research Centres: Research Techno Plaza 
CNRS International NTU THALES Research Alliances 
Rights: © 2021 Wiley-VCH GmbH. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:EEE Journal Articles
MSE Journal Articles
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