Abstract
Bimetallic sulfide materials are considered as suitable candidates for improving the oxygen evaluation reaction (OER) performance. Here, CoNi2S4 materials are developed by an effective hydrothermal approach and employing anhydrous Na2S.xH2O as sulfur precursor. Altering the molar concentrations of Co and Ni precursors affects the morphologies, Co, Ni contents, Co3+ and Ni3+ centers. CoNi2S4–1 with lower concentrations possesses higher Co3+, Ni3+ and Co3+/Co2+ ratios boosting the OER performance. In addition, CoNi2S4–1 demonstrates a potential of 1.60 V vs. RHE to generate a 10 mA cm−2 with a lower Tafel slope, better mass activity and stability in an alkaline solution.
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