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

• 来源期刊: 能源化学
• 年，卷（期）: 2017,（6）
• 页码范围: 1203-1209
• 页数: 7页
• 语种: 英文

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 (260mV at 20mA cm-2) and smaller Tafel slopes (56mV 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.