Abstract 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.

中文翻译：

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无配体氧化铱在钛上高质量负载的阳极电沉积及电化学处理研究

摘要 作为盐水电解中的电催化剂，在钛基底上进行了高产率的 IrOx 颗粒阳极电沉积。通过在碱性溶液中水解 IrCl3·3H2O 然后进行酸缩合过程，形成稳定的无配体的 IrOx.nH2O。在不同的 pH 值和老化时间下，水解的 Ir 转化为 IrOx.nH2O 颗粒的转化率通过紫外-可见光谱进行评估。在 10 小时的老化时间内，在 pH 11 下制备稳定的 IrOx 悬浮液。IrOx 的电沉积使用了恒电位和动态电位扫描方法。对 IrOx 形成的循环伏安法分析表明，IrOx 沉积需要 0.6 V（相对于 SCE）的阳极电位。结果表明，基于动态电位扫描的电沉积过程提高了 IrOx 的产率和对析氧的电催化活性。使用 X 射线光电子能谱观察到的 Ir(III) 和 Ir(IV) 的存在证实了 Ir(III)/Ir(IV) 的可逆转变发生在 IrOx 在表面上的生长过程中。