期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 561, 期 -, 页码 829-837出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.11.065
关键词
Cobalt-gluconate; Micro/mesoporous carbon spheres; High-density Co9S8 nanocrystals; Nitrogen and sulfur co-doping; Oxygen reduction reaction
资金
- National Key Research and Development Program of China [2018YFF0215002]
- National Natural Science Foundation of China [U1662114]
- Scientific Research Foundation of Wuhan Institute of Technology of China [K201942]
- Research Foundation of Education Bureau of Hunan Province of China [18B347]
- Natural Science Foundation of Hunan Province of China [2019JJ50205]
The exploration of an efficient nonprecious electrocatalyst for oxygen reduction reaction (ORR) is critical to the commercialization of various electrochemical energy-conversion devices. Herein, a cobaltgluconate-derived nitrogen and sulfur dual-doped micro/mesoporous carbon sphere (Co9S8/N, S-MCS) with encapsulated high-density cobalt sulfide (Co9S8) nanocrystals is developed by annealing and subsequent high-temperature vulcanization. Particularly, the vulcanization temperature has a critical impact on the formation of high-density Co9S8 nanocrystals. Benefiting from the favorable material characteristics of large surface area, abundant micro/mesopores and high graphitic nanostructures, as well as the synergistic effects between high-density Co9S8 nanocrystals and N, S-dual doped graphitic carbon shells, the resulting catalyst demonstrates superior ORR catalytic activity and durability compared to platinum/carbon (Pt/C) catalyst. More notably, the proposed approach can be extended potentially to fabricate other transition metal sulfide (or oxide, carbide) based electrocatalysts. (C) 2019 Elsevier Inc. All rights reserved.
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