WO_(3)/BiVO_(4)复合薄膜的制备及其光电化学性能

Preparation and photoelectrochemical properties of WO_(3)/BiVO_(4) composite films

导电玻璃作为基底制备WO_(3)纳米片薄膜,通过改变旋涂BiVO_(4)次数,以WO_(3)纳米片薄膜为基底成功制得不同厚度的WO_(3)/BiVO_(4)复合薄膜样品。利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)等分析方法对样品进行表征,并对WO_(3)/BiVO_(4)复合薄膜样品进行吸收光谱、光电流、光电催化和交流阻抗测试。结果表明:WO_(3)/BiVO_(4)复合薄膜样品的光电流密度和光电催化降解效率相较于单一WO_(3)纳米薄膜都得到了提高,具有更好的光电化学性能。且旋涂两次BiVO_(4)的WO_(3)/BiVO_(4)复合薄膜样品有最高的光电流密度值(1.79 mA/cm^(2))和光电催化降解效率(约为60.5%),比单一WO_(3)材料的光电流密度(1.30 mA/cm^(2))提高了27.4%,光电催化降解效率也比单一WO_(3)材料的光电催化降解效率(约为47.9%)提升了26.3%,具有最优异的光电化学性能。

WO_(3) nanosheet films were prepared on the conductive glass substrate.WO_(3)/BiVO_(4) composite film samples with different thicknesses were successfully synthesized on WO_(3) nanosheet films by changing the number of spin coating of BiVO_(4).X-ray diffraction and scanning electron microscopy were used to characterize samples.WO_(3)/BiVO_(4) composite film samples were tested for absorption spectrum,photocurrent,photoelectrocatalysis and alternating current impedance.The results show that the photocurrent density and photocatalytic degradation efficiency of the WO_(3)/BiVO_(4) composite film sample are improved compared with pure WO_(3) nanosheet films,and it has better photoelectrochemical property.Meanwhile,WO_(3)/BiVO_(4) composite film sample with twice spin coating of BiVO_(4) has the highest photocurrent density(1.79 mA/cm^(2))and photoelectric degradation efficiency(about 60.5%),which is increased by 27.4%than the photocurrent density of pure WO_(3) films(1.30 mA/cm^(2)),the photoelectric degradation efficiency is also 26.3%higher than pure WO_(3) films(approximately 47.9%),and has the most excellent photoelectrochemical property.