Electrochemical fabrication of FeSx films with high catalytic activity for oxygen evolution |
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Authors: | Wenbin Wang Ruidong Xu Bohao Yu Xuanbin Wang Suyang Feng |
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Institution: | Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093 China.; State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming 650093 China |
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Abstract: | Electrochemical decomposition of water to produce oxygen (O2) and hydrogen (H2) through an anodic oxygen evolution reaction (OER) and a cathodic hydrogen evolution reaction (HER) is a promising green method for sustainable energy supply. Here, we demonstrate that cauliflower-like S-doped iron microsphere films are materials that can efficiently decompose water as an electrocatalyst for the oxygen evolution reaction. FeSx films are prepared by a simple one-step electrodeposition method and directly grow on copper foam from a deep eutectic solvent, ethaline (mixture of choline chloride and ethylene glycol), as a durable and highly efficient catalyst for the OER in 1.0 M KOH. The prepared FeSx/CF, as an oxygen-evolving anode, shows remarkable catalytic performance toward the OER with a moderate Tafel slope of 105 mV dec−1, and require an overpotential of only 340 mV to drive a geometrical catalytic current density of 10 mA cm−2. In addition, this catalyst also demonstrates strong long-term electrochemical durability. This study provides a simple synthesis route for practical applications of limited transition metal nano catalysts.Electrochemical decomposition of water to produce oxygen (O2) and hydrogen (H2) through an anodic oxygen evolution reaction (OER) and a cathodic hydrogen evolution reaction (HER) is a promising green method for sustainable energy supply. |
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