Abstract
Design and direct construction of oxygen evolution reaction (OER) catalyst-based electrode is an efficient route to improve the water splitting reaction. Herein, we proposed a facile route to synthesize and load the composite of amorphous CoFe oxyhydroxide (CoFeOx(OH)y) and MoS2 on the carbon paper by combining a hydrothermal and an electrodeposition process. CoFeOx(OH)y has a special feature of long-range disorder (amorphous phase) and short-range order (crystal phase), which greatly improves the OER catalytic performance of the hybrids. In virtue of the synergistic effect of CoFeOx(OH)y and MoS2, an improved electronic coupling effect occurs, which increases the oxidation state of Co and Fe, and thus enhances OER activity. As-synthesized CoFeOx(OH)y/MoS2/CP (CFOMS/CP) electrode affords excellent electrocatalytic activity and good electrochemical OER stability: A small Tafel slope of 37.9 mV dec−1 (vs. 62.1 mV dec−1 for CoFeOx(OH)y/CP, 120.2 mV dec−1 for RuO2/CP) and low overpotential 242 mV at 10 mA cm−2 (vs. 263 mV for CoFeOx(OH)y/CP, 317 mV for RuO2/CP), as well as a stable running for 25 h.
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