Abstract
The electrocatalytic overall water splitting is currently regarded as an efficient method for reservation and conversion of sustainable energy sources. The earth-abundant transition-metal chalcogenides (TMCs) possess unique properties to realize hydrogen evolution reaction (HER), but the semiconductor 2H phase behaves a medial activity for HER and even worse performance for oxygen evolution reaction (OER). To date, developing the efficient and bifunctional TMCs electrocatalyst is an attractive but difficult task. Herein, Co-doped 1T′/T phase dominated MoS1+XSe1+Y alloy (Co-MoS1+XSe1+Y) nanosheets electrocatalysts were synthesized by a one-step facial hydrothermal method. Meanwhile, the crystal structures and element composition of the Co-MoS1+XSe1+Y were determined by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. Importantly, the as-prepared catalysts Co-MoS1+XSe1+Y with the atomic ratio of Co: Mo = 1: 5 (Co-MoS1+XSe1+Y1-5) shows superior electrochemical activity, achieving current density (j) of 10 mA cm−2 at small overpotentials of 119 mV and 280 mV for HER and OER in 1.0 M KOH, respectively. Moreover, applying the bifunctional electrode in an alkaline water electrolytic cell allows a high-efficiency electrocatalyst with only 1.60 V at j = 10 mA cm−2, which could be practical in electrocatalytic overall water splitting reaction devices.
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