Assembling Co9S8 nanoflakes on Co3O4 nanowires as advanced core/shell electrocatalysts for oxygen evolution reaction

doi:10.1016/j.jechem.2017.10.015

能源化学(英文) ›› 2017, Vol. 26 ›› Issue (6): 1203-1209.DOI: 10.1016/j.jechem.2017.10.015

Assembling Co₉S₈ nanoflakes on Co₃O₄ nanowires as advanced core/shell electrocatalysts for oxygen evolution reaction

Shengjue Deng^a, Shenghui Shen^a, Yu Zhong^a, Kaili Zhang^a, Jianbo Wu^b, Xiuli Wang^a, Xinhui Xia^a, Jiangping Tu^a

a State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China;
b Zhejiang Provincial Key Laboratory for Cutting Tools, Taizhou University, Taizhou 318000, Zhejiang, China

收稿日期:2017-10-07 修回日期:2017-10-20 发布日期:2017-11-24
通讯作者: Xinhui Xia,E-mail address:helloxxh@zju.edu.cn
基金资助:
This work is supported by the National Natural Science Foundation of China (grant no. 51728204, 51772272 and 51502263), Qianjiang Talents Plan D (grant. no. QJD1602029) and the Startup Foundation for Hundred-Talent Program of Zhejiang University. J. Tu acknowledges the support by the Program for Innovative Research Team in University of Ministry of Education of China (IRT13037) and the Key Science and Technology Innovation Team of Zhejiang Province (2010R50013).

Assembling Co₉S₈ nanoflakes on Co₃O₄ nanowires as advanced core/shell electrocatalysts for oxygen evolution reaction

Shengjue Deng^a, Shenghui Shen^a, Yu Zhong^a, Kaili Zhang^a, Jianbo Wu^b, Xiuli Wang^a, Xinhui Xia^a, Jiangping Tu^a

a State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China;
b Zhejiang Provincial Key Laboratory for Cutting Tools, Taizhou University, Taizhou 318000, Zhejiang, China

Received:2017-10-07 Revised:2017-10-20 Published:2017-11-24
Contact: Xinhui Xia,E-mail address:helloxxh@zju.edu.cn
Supported by:
This work is supported by the National Natural Science Foundation of China (grant no. 51728204, 51772272 and 51502263), Qianjiang Talents Plan D (grant. no. QJD1602029) and the Startup Foundation for Hundred-Talent Program of Zhejiang University. J. Tu acknowledges the support by the Program for Innovative Research Team in University of Ministry of Education of China (IRT13037) and the Key Science and Technology Innovation Team of Zhejiang Province (2010R50013).

摘要/Abstract

摘要： Rational design of advanced cost-effective electrocatalysts is vital for the development of water electrolysis. Herein, we report a novel binder-free efficient Co₉S₈@Co₃O₄ core/shell electrocatalysts for oxygen evolution reaction (OER) via a combined hydrothermal-sulfurization method. The sulfurized net-like Co₉S₈ nanoflakes are strongly anchored on the Co₃O₄ nanowire core forming self-supported binder-free core/shell electrocatalysts. Positive advantages including larger active surface area of Co₉S₈ nanoflakes, and reinforced structural stability are achieved in the Co₉S₈@Co₃O₄ core/shell arrays. The OER performances of the Co₉S₈@Co₃O₄ core/shell arrays are thoroughly tested and enhanced electrocatalytic performance with lower over-potential (260 mV at 20 mA cm^-2) and smaller Tafel slopes (56 mV dec^-1) as well as long-term durability are demonstrated in alkaline medium. Our proposed core/shell smart design may provide a new way to construct other advanced binder-free electrocatalysts for applications in electrochemical catalysis.

关键词: Metal sulfides, Nanoflakes, Nanowires, Core/shell arrays, Electrocatalysis, Oxygen evolution reaction

Abstract: Rational design of advanced cost-effective electrocatalysts is vital for the development of water electrolysis. Herein, we report a novel binder-free efficient Co₉S₈@Co₃O₄ core/shell electrocatalysts for oxygen evolution reaction (OER) via a combined hydrothermal-sulfurization method. The sulfurized net-like Co₉S₈ nanoflakes are strongly anchored on the Co₃O₄ nanowire core forming self-supported binder-free core/shell electrocatalysts. Positive advantages including larger active surface area of Co₉S₈ nanoflakes, and reinforced structural stability are achieved in the Co₉S₈@Co₃O₄ core/shell arrays. The OER performances of the Co₉S₈@Co₃O₄ core/shell arrays are thoroughly tested and enhanced electrocatalytic performance with lower over-potential (260 mV at 20 mA cm^-2) and smaller Tafel slopes (56 mV dec^-1) as well as long-term durability are demonstrated in alkaline medium. Our proposed core/shell smart design may provide a new way to construct other advanced binder-free electrocatalysts for applications in electrochemical catalysis.

Key words: Metal sulfides, Nanoflakes, Nanowires, Core/shell arrays, Electrocatalysis, Oxygen evolution reaction

Shengjue Deng, Shenghui Shen, Yu Zhong, Kaili Zhang, Jianbo Wu, Xiuli Wang, Xinhui Xia, Jiangping Tu. Assembling Co₉S₈ nanoflakes on Co₃O₄ nanowires as advanced core/shell electrocatalysts for oxygen evolution reaction[J]. 能源化学(英文), 2017, 26(6): 1203-1209.

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Assembling Co₉S₈ nanoflakes on Co₃O₄ nanowires as advanced core/shell electrocatalysts for oxygen evolution reaction

Assembling Co₉S₈ nanoflakes on Co₃O₄ nanowires as advanced core/shell electrocatalysts for oxygen evolution reaction

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