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Construction of three-dimensional hierarchical flower-like M(OH)(OCH3) (M = Co and Cu) microspheres for high
Pan Yang1, Congmin Fan1, Tiancheng Feng1
1College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China. fcongmin@mail.ustc.edu.cn.
Abstract:
The slow kinetics of the oxygen evolution reaction hinders the efficiency of water decomposition, so it is crucial to develop noble metal-free electrocatalysts for the efficient decomposition of water via the oxygen evolution reaction (OER) in alkaline electrolytes. In this study, flower-like structured hydroxides grown in situ, consisting of ultrathin nanosheets stacked on Fe Foam (FF), were prepared by a one-step hydrothermal method for an efficient electrocatalytic oxygen evolution reaction. M(OH)(OCH3) (M = Co and Cu) requires only a low overpotential of 270 mV and 379 mV for the OER, to provide 20 mA cm-2 and 100 mA cm-2 current densities, respectively. With the synergistic effect of Co2+ and Cu2+, the adsorption capacity of the intermediate OH* and the conductivity are improved, and the structural surface reconstruction is promoted by methoxide. In this work, the structure of FF-based electrocatalysts was modulated by the introduction of Co2+ and Cu2+ and the formation of methoxy anions, which improved the catalytic activity of the catalysts.
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