WO3/ZnWO4复合薄膜的制备及其光电化学性能

Preparation of WO_(3)/ZnWO_(4) composite film and its photoelectrochemical performance

采用水热法在导电玻璃(FTO)上制备WO_(3)纳米薄膜,然后通过改变水热反应时长(1、3、5 h)在WO_(3)纳米薄膜上成功制备了WO_(3)/ZnWO_(4)复合薄膜。利用XRD和SEM对WO_(3)/ZnWO_(4)复合薄膜样品的组成结构及形貌进行分析。并对WO_(3)/ZnWO_(4)复合薄膜样品进行吸收光谱测试、光电流测试、光电催化测试和交流阻抗测试。结果表明,在1.6 V时模拟太阳光照射下,单一WO_(3)纳米薄膜光电流密度为1.61 mA/cm^(2),光电催化效率约为42.9%。WO_(3)/ZnWO_(4)复合薄膜样品相较于单一WO_(3)纳米薄膜,其光吸收特性、光电流特性及光电催化活性显著提升。且水热反应3 h的WO_(3)/ZnWO_(4)复合薄膜样品相较于水热反应1和5 h的WO_(3)/ZnWO_(4)复合薄膜样品具有更优的光电化学性能,其光电流密度达到2.49 mA/cm^(2),光电催化效率约为61.8%。

WO_(3) nano-film was prepared by hydrothermal method on conductive glass(FTO).Then,WO_(3)/Zn WO_(4) composite films were successfully prepared on WO_(3) nano-film with different hydrothermal reaction time(1,3,5 h).The composition,structure and morphology of WO_(3)/Zn WO_(4) composite film samples were analyzed by XRD and SEM.The WO_(3)/Zn WO_(4) composite film samples were tested by absorption spectrum,photocurrent,photoelectric catalysis and AC(alternating current)impedance.The results showed that the photocurrent density of single WO_(3) nano-film was 1.61 m A/cm^(2),and the photoelectric catalytic efficiency was about 42.9%,under 1.6 V and simulated sunlight conditions.The light absorption characteristics,photocurrent characteristics and photoelectric catalytic activity of WO_(3)/Zn WO_(4) composite film samples were better than those of single WO_(3) nano-film.Moreover,the WO_(3)/Zn WO_(4) composite film with hydrothermal reaction of 3 h had the best photoelectrochemical performance compared with those with hydrothermal reaction of 1 and 5 h.Its photocurrent density reached 2.49 m A/cm^(2),and its photoelectric catalytic efficiency was about 61.8%.