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Rational design of advanced cost-effective electrocatalysts is vital for the development of water electrolysis. Herein, we report a novel binder-free efficient Co_9S_8@Co_3O_4 core/shell electrocatalysts for oxygen evolution reaction(OER) via a combined hydrothermal-sulfurization method. The sulfurized net-like Co_9S_8 nanoflakes are strongly anchored on the Co_3O_4 nanowire core forming self-supported binder-free core/shell electrocatalysts. Positive advantages including larger active surface area of Co_9S_8 nanoflakes,and reinforced structural stability are achieved in the Co_9S_8@Co_3O_4 core/shell arrays. The OER performances of the Co_9S_8@Co_3O_4 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.
Rational design of advanced cost-effective electrocatalysts is vital for the development of water electrolysis. Herein, we report a novel binder-free efficient Co_9S_8 @ Co_3O_4 core / shell electrocatalysts for oxygen evolution reaction (OER) via a combined hydrothermal-sulfurization method. Sulfurized net-like Co_9S_8 nanoflakes are strongly anchored on the Co_3O_4 nanowire core forming self-supported binder-free core / shell electrocatalysts. Positive features include larger active surface area of Co_9S_8 nanoflakes, and reinforced structural stability are achieved in Co_9S_8 @ Co_3O_4 core / shell arrays. The OER performances of the Co_9S_8 @ Co_3O_4 core / shell arrays were thoroughly tested and enhanced electrocatalytic performance with lower over-potential (260 mV 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-fre e electrocatalysts for applications in electrochemical catalysis.