含石墨烯IrO2-Ta2O5涂层钛阳极性能改进研究

Study on Properties of IrO2-Ta2O5 Coated Titanium Anodes Modified with Graphene

摘要:

采用热分解的方法制备了不同含量石墨烯(graphene)的IrO2-Ta2O5涂层钛阳极(Ti/IrO2-Ta2O5-G)，并运用场发射扫描电子显微镜（FESEM)、能谱仪(EDX)等分析手段和循环伏安(CV)、阳极极化及电化学阻抗谱(EIS)等测试方法对阳极的微观结构和电化学性能进行研究。结果表明：Ti/IrO2-Ta2O5-G阳极表面凹凸不平，裂纹细而小，为析氧反应提供了更多的活性中心，电化学活性表面积增大，析氧电催化活性增强；加有不同量石墨烯的Ti/IrO2-Ta2O5-G阳极的电化学性能有一定差别，其中加入0.4 g稬-1石墨烯阳极的电化学性能提高最明显。

Abstract:

The IrO2-Ta2O5 coated titanium anodes (Ti/IrO2-Ta2O5-G) with different graphene contents were prepared by thermal decomposition method. The microstructure was analyzed by FESEM and EDX, and the electrochemical properties were investigated by electrochemical testing including cyclic voltammetry(CV), anode polarization curves, and electrochemical impedance spectroscopy(EIS). As compared with the traditional Ti/IrO2-Ta2O5 anode, the results indicate that the rugged surface morphology with tiny cracks of the Ti/IrO2-Ta2O5-G anodes offer more active center for oxygen evolution reaction and have larger electrochemically active surface area, better electrocatalytic activity for oxygen evolution. The Ti/IrO2-Ta2O5-G anode with 0.4 g稬-1 graphene contents presents the best electrochemical performance.