Ti基IrO2+Ta2O5梯度化涂层电极的制备及其电催化性能

摘要

以Ta2O5为底层,将不同摩尔比的Ir-Ta前驱体溶液依次涂敷在Ti基体表面,制备了一种Ti/IrO2+Ta2O5梯度化涂层电极.通过扫面电子显微镜(SEM)、能谱测试仪(EDS)和X射线衍射测试仪(XRD)分别考察电极表面涂层的形貌、元素和物相组成,采用线性扫描伏安曲线(LSV)、恒电流极化曲线和强化寿命测试方法分别研究电极的析氧电催化活性和稳定性,考察底层厚度和梯度化活性层厚度配比对电极寿命的影响.结果表明:在相同的活性组分IrO2担载量下,与采用传统方法制备的Ti/IrO2+Ta2O5电极相比,Ti/IrO2+Ta2O5梯度化涂层电极具有更优越的电催化活性和稳定性.%An IrO2+Ta2O5/Ti gradient coating anode using Ta2O5as the under-layer was prepared by modified technology, the precursor solutions with different molar rations of Ir to Ta were coated on titanium, respectively. The micrograph, element composition and phase structure of the coating were analyzed by scanning electron microscopy, energy disperse X-ray spectroscopy and X-ray diffractometry, respectively. The electrocatalytic activity and electrochemical stability of the coating for O2evolution reaction were also characterized by linear sweep voltammetry, chronopotentiometry and accelerating life test, respectively. The effects of the thickness of the under-layer and the thickness ration of the various gradient coatings on the accelerated life of the anodes for O2evolution reaction were investigated. The results show that, for the same loading mass of IrO2, the IrO2+Ta2O5/Ti gradient coating anodes exhibit higher electrocatalytic activity and electrochemical stability comparing with the IrO2+Ta2O5/Ti anodes prepared by the traditional method.