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

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...

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Bibliographic Details
Published in:Journal of energy chemistry 2017-11, Vol.26 (6), p.1203-1209
Main Authors: Deng, Shengjue, Shen, Shenghui, Zhong, Yu, Zhang, Kaili, Wu, Jianbo, Wang, Xiuli, Xia, Xinhui, Tu, Jiangping
Format: Article
Language:English
Subjects:
Core/shell arrays
Electrocatalysis
Metal sulfides
Nanoflakes
Nanowires
Oxygen evolution reaction
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Summary: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 m V at 20 m A 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.
ISSN:2095-4956
DOI:10.1016/j.jechem.2017.10.015