WO_(3)/CuWO_(4)复合薄膜的制备及光电化学性能

Preparation and Photoelectrochemical Properties of WO_(3)/CuWO_(4)Composite Film

本工作以两步水热法成功制备了三维立体结构的WO_(3)/CuWO_(4)复合薄膜,通过调整CuWO_(4)的水热时间得到了复合薄膜的最佳制备条件,并对WO_(3)/CuWO_(4)复合薄膜进行吸收光谱测试、光电流测试、光电催化测试和电化学阻抗测试。结果表明,所制备的WO_(3)/CuWO_(4)-5 h复合薄膜的带隙介于CuWO_(4)和WO_(3)之间,为2.44 eV,具有更宽的光谱响应范围;在1.5 V的偏压下,WO_(3)/CuWO_(4)-5 h复合薄膜表现出2.11 mA/cm 2的高光电流密度;WO_(3)/CuWO_(4)-5 h复合薄膜对亚甲基蓝溶液的光电催化降解效率为58.5%,高于WO_(3)薄膜(降解效率为41.4%);电化学阻抗谱表明,WO_(3)/CuWO_(4)薄膜电荷转移电阻比单一WO_(3)薄膜小,对应更好的光电化学性能。

WO_(3)/CuWO_(4)composite films with three-dimensional structure were successfully prepared by a two-step hydrothermal method.The optimal preparation conditions for the WO_(3)/CuWO_(4)composite films were obtained by adjusting the hydrothermal time of CuWO_(4).The photoelectric performance parameters of WO_(3)/CuWO_(4)composite films were obtained by absorption spectrum test,photocurrent test,photoelectrocatalysis test,and electrochemical impedance test.The results show that the band gap of WO_(3)/CuWO_(4)-5 h composite film was 2.44 eV between CuWO_(4)and WO_(3),which indicated a wider spectral response range.WO_(3)/CuWO_(4)-5 h composite film exhibited a high photocurrent density of 2.11 mA/cm 2 at 1.5 V vs.Ag/AgCl.The photoelectrocatalysis degradation efficiency of methylene blue solution by WO_(3)/CuWO_(4)-5 h composite film was 58.5%,which was higher than that of the pure WO_(3)film(degradation efficiency was 41.4%).Electrochemical impedance spectroscopy showed that the charge transfer resistance of WO_(3)/CuWO_(4)was less than that of pure WO_(3)film,corresponding to better photoelectrochemical performance.