化学
铱
循环伏安法
电催化剂
电解
析氧
无机化学
电化学
X射线光电子能谱
阳极
介电谱
化学工程
电极
电解质
物理化学
催化作用
有机化学
工程类
作者
Mehrad Mehdipour,Seyed Hadi Tabaian,Sadegh Firoozi
标识
DOI:10.1016/j.jelechem.2020.113831
摘要
A high yielding anodic electrodeposition of IrOx particles was conducted on Ti substrates as an electrocatalyst in brine electrolysis. The formation of a stable ligand-free IrOx.nH2O was performed by hydrolyzing IrCl3·3H2O in alkaline solution followed by acid condensation process. The conversion of hydrolyzed Ir to the IrOx.nH2O particles at different pH and aging times are evaluated by the UV–visible spectroscopy. Stable IrOx suspension was prepared at pH 11 in 10 h aging time. Potentiostatic and dynamic potential sweep methods were used for the electrodeposition of IrOx. The cyclic voltammetry analysis on the formation of IrOx indicates that an anodic potential of 0.6 V (vs. SCE) is required for IrOx deposition. The results show that the electrodeposition process based on dynamic potential sweeps enhances the yield of IrOx and the electrocatalytic activity toward the oxygen evolution. The presence of both Ir(III) and Ir(IV) which was observed using X-ray photoelectron spectroscopy confirms the reversible transition of Ir(III)/Ir(IV) occurs during the growth of IrOx on the surface.
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