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N-Doped Defective Carbon Layer Encapsulated W2C as a Multifunctional Cathode Catalyst for High Performance Li-O2Battery
Gao, Rui1; Zhou, Yao2; Liu, Xiangfeng1; Wang, Jiacheng2
2017
Source PublicationElectrochimica Acta
ISSN00134686
Volume245Pages:430-437
AbstractThe sluggish kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) restricts the practical application of Li-O2batteries. The design and facile synthesis of cathode catalysts with high activity on both ORR and OER are desired. In this study, an ultrathin N-doped defective carbon layer-encapsulated W2C hybrid (W2C@NC) which has been successfully synthesized through a facile in-situ pyrolysis and reduction of WO3@g-C3N4shows a high activity on ORR, OER and even the decomposition of the undesired Li2CO3as a multifunctional cathode catalyst for Li-O2batteries. The cells catalyzed by W2C@NC show a much higher initial capacity of 10976 mAh g−1, lower overpotential and longer cycle life, which can be largely attributed to the synergistic effect of W2C nanoparticles and the ultrathin defective N-doped carbon layers. The unique architecture not only accelerates the electron and Li+conduction but also provides more active sites, which lead to the large enhancement of the electrocatalytic performance. In addition to the high activity on both ORR and OER, W2C@NC also shows a high catalytic function on the decomposition of the undesired side product of Li2CO3. This study offers some new insights into the design and synthesis of novel high performance cathode catalyst for Li-O2battery. © 2017 Elsevier Ltd
DOI10.1016/j.electacta.2017.05.177
EI Accession Number20172303731632
EI KeywordsLithium-air batteries
EI Classification Number802.2 Chemical Reactions - 804 Chemical Products Generally
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Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/25881
Collection中国科学院上海硅酸盐研究所
Affiliation1.College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing; 100049, China;
2.State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai; 200050, China
Recommended Citation
GB/T 7714
Gao, Rui,Zhou, Yao,Liu, Xiangfeng,et al. N-Doped Defective Carbon Layer Encapsulated W2C as a Multifunctional Cathode Catalyst for High Performance Li-O2Battery[J]. Electrochimica Acta,2017,245:430-437.
APA Gao, Rui,Zhou, Yao,Liu, Xiangfeng,&Wang, Jiacheng.(2017).N-Doped Defective Carbon Layer Encapsulated W2C as a Multifunctional Cathode Catalyst for High Performance Li-O2Battery.Electrochimica Acta,245,430-437.
MLA Gao, Rui,et al."N-Doped Defective Carbon Layer Encapsulated W2C as a Multifunctional Cathode Catalyst for High Performance Li-O2Battery".Electrochimica Acta 245(2017):430-437.
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