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Anion-Regulated Selective Generation of Cobalt Sites in Carbon: Toward Superior Bifunctional Electrocatalysis
Wan, Gang1,2; Yang, Ce3; Zhao, Wanpeng1,2; Li, Qianru1,2; Wang, Ning1,2; Li, Tao4; Zhou, Hua4; Chen, Hangrong1; Shi, Jianlin1
2017
发表期刊Advanced Materials
ISSN09359648
卷号29期号:47
摘要The introduction of active transition metal sites (TMSs) in carbon enables the synthesis of noble-metal-free electrocatalysts for clean energy conversion applications; however, there are often multiple existing forms of TMSs, which are of different natures and catalytic models. Regulating the evolution of distinctive TMSs is highly desirable but remains challenging to date. Anions, as essential elements involved in the synthesis, have been totally neglected previously in the construction of TMSs. Herein, the effects of anions on the creation of different types of TMSs are investigated for the first time. It is found that the active cobalt–nitrogen sites tend to be selectively constructed on the surface of N-doped carbon by using chloride, while metallic cobalt nanoparticles encased in protective graphite layers are the dominant forms of cobalt species with nitrate ions. The obtained catalysts demonstrate cobalt-sites-dependent activity for oxygen reduction reaction and hydrogen evolution reaction in acidic media. The remarkably enhanced catalytic activities approaching that of benchmark Pt/C in an acidic medium have been obtained on the catalyst dominated with cobalt–nitrogen sites, confirmed by the advanced spectroscopic characterization. This finding demonstrates a general paradigm of anion-regulated evolution of distinctive TMSs, providing a new pathway for enhancing performances of various targeted reactions related with TMSs. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
DOI10.1002/adma.201703436
EI入藏号20174504384204
EI主题词Cobalt compounds
EI分类号525.5 Energy Conversion Issues - 547.1 Precious Metals - 802.2 Chemical Reactions - 803 Chemical Agents and Basic Industrial Chemicals
引用统计
被引频次:29[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.sic.ac.cn/handle/331005/25704
专题中国科学院上海硅酸盐研究所
作者单位1.State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Ding-xi Road, Shanghai; 200050, China;
2.University of Chinese Academy of Sciences, Beijing; 100049, China;
3.Chemical Science and Engineering Division, Argonne National Laboratory, 9700 Cass Avenue, Lemont; IL; 60439, United States;
4.X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, 9700 Cass Avenue, Lemont; IL; 60439, United States
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Wan, Gang,Yang, Ce,Zhao, Wanpeng,et al. Anion-Regulated Selective Generation of Cobalt Sites in Carbon: Toward Superior Bifunctional Electrocatalysis[J]. Advanced Materials,2017,29(47).
APA Wan, Gang.,Yang, Ce.,Zhao, Wanpeng.,Li, Qianru.,Wang, Ning.,...&Shi, Jianlin.(2017).Anion-Regulated Selective Generation of Cobalt Sites in Carbon: Toward Superior Bifunctional Electrocatalysis.Advanced Materials,29(47).
MLA Wan, Gang,et al."Anion-Regulated Selective Generation of Cobalt Sites in Carbon: Toward Superior Bifunctional Electrocatalysis".Advanced Materials 29.47(2017).
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