The physical–chemical properties and electrocatalytic performance of iridium oxide in oxygen evolution |
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Authors: | Junyuan Xu Meng Wang Gaoyang Liu Jianling Li Xindong Wang |
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Affiliation: | aState Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, 30 College Road, Beijing 100083, China;bDepartment of Physical Chemistry, University of Science and Technology Beijing, 30 College Road, Beijing 100083, China |
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Abstract: | An IrO2 anode catalyst was prepared by using the Adams method for the application of a solid polymer electrolyte (SPE) water electrolyzer. The effect of calcination temperature on the physical–chemical properties and the electrochemical performance of IrO2 were examined to obtain a low loading and a high catalytic activity of oxygen evolution at the electrode. The physical–chemical properties were studied via thermogravimetry–differential scanning calorimetry (TG–DSC), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The electrochemical activity was investigated by using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and chronopotentiometry in 0.1 mol L−1 H2SO4 at room temperature. The optimum condition was found to be at the calcination temperature of 500 °C, where the total polarization reached a minimum at high current densities (>200 mA cm−2). The optimized catalyst was also applied to a membrane electrode assembly (MEA) and stationary current–potential relationships were investigated. With an optimized catalytic IrO2 loading of 1.5 mg cm−2 and a 40% Pt/C loading of 0.5 mg cm−2, the terminal applied potential difference was 1.72 V at 2 A cm−2 and 80 °C in a SPE water electrolysis cell. |
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Keywords: | SPE water electrolysis Oxygen evolution reaction Iridium oxide Adams method |
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