A highly active hydrogen evolution electrocatalyst based on a cobalt–nickel sulfide composite electrode†
Yee-Fun
Lim 
*a
*a
Abstract
A novel Co9S8–NixSy/Ni foam composite material was synthesized through the thermal decomposition of a cobalt–thiourea molecular precursor onto a 3D metallic support. The obtained electrode exhibited good activity toward the hydrogen evolution reaction in an alkaline medium, requiring a small overpotential of 163 mV at a current density of 10 mA cm−2, which is one of the lowest ever reported among transition metal sulfide materials.
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