新型钛基体PbO2电极的制备及降解性能研究

采用电沉积法制备钛基体PbO2电极并对其表面形貌进行了表征,所制备的电极具有较高的析氧电位和良好的电催化活性。以制备的钛基PbO2为阳极,抛光钛电极为阴极,分别进行电流密度、反应时间、pH、电解质质量浓度等单因素试验,确定PbO2电极对亚甲基蓝的最优降解条件为:pH=6,电解质质量浓度为5.0 g.L-1,电流密度为5×10-2A.cm-2,该条件下亚甲基蓝1 h的降解率可以达到99%;且电流密度为0.25×10-2A.cm-2时能耗最低。

THE PREPARATION AND PERFORMANCE ANALYSIS OF NEW TYPE Ti/PbO2 ELECTRODE

Expanded titanium covered with PbO2 electrode was produced by electrodeposition.The surface morphology and the structure of the prepared thin film were characterized by scanning electronic microscopy(SEM) and X-ray diffraction(XRD),respectively.The electrochemical activity of the electrode for oxygen evolution reaction was examined by electrochemical test.The prepared Ti/PbO2 electrode exhibited larger active surface area and higher oxygen vacancy deficiency,which resulted in its higher electrocatalytic activity.Electroxidation of methylene blue in aqueous solution was studied to evaluate the potential applications with PbO2 thin film as positive electrode and stainless steel as negative electrode.The effects of initial pH,retention time,supporting electrolyte,current density on the process performance were examined.Experimental results revealed that current density of 5×10-2 A·cm-2,initial pH of 6,supporting electrolyte of 5 g·L-1 were beneficial for Methylene blue oxidation.methylene blue could be diminished up to 99% under this condition.And at the current density of 0.25×10-2 A·cm-2,oxidation had the lowest energy consumption.