Abstract
AbstractCoS, a low cost and efficient electrocatalyst for oxygen evolution reaction (OER), has attract great research interest but its electrosynthesis to delicately tune the nanostructures has not been carried out. Herein, for the first time by the use of potassium thiocyanate (KSCN) as sulfur source, CoS nanosheets are time‐controlled electrosynthesized and further evolved to a 3D flower‐like nanostructure, in which KSCN plays a critical role. With a deposition time of 1200s, the catalyst shows excellent catalytic activity toward OER, achieving a small Tafel slope of 55 mV dec−1 and only requires an overpotential of 310 mV to deliver a current density of 10 mA cm−2, better than the benchmark IrO2 and other electrodeposited cobalt sulfide catalysts. The enhancement mechanism is attributed to the unique nanostructure offering a large electroactive surface while allowing reactants accessing the reaction surface and the produced oxygen bubble escaping out for a fast electrode kinetics toward OER.
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