采用刮涂法制备一种新型光阳极WO3?x/TiO2薄膜，并对其进行光电催化还原CO2制备甲酸。运用X射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)对光阳极薄膜进行表征。通过XPS确认WO3?x中存在氧空位，并通过电位滴定法精确测定WO3?x中的氧指数。光电催化还原CO23 h后，WO3?x/TiO2薄膜光阳极的甲酸产量为872 nmol/cm2，是WO3/TiO2薄膜光阳极的1.83倍。光电化学测试表明，由于氧空位的存在提高材料电荷传输性能，从而提高光电催化还原CO2活性，故WO3?x/TiO2薄膜光阳极相对WO3/TiO2具有更好的光电催化还原活性。
A novel WO3?x/TiO2 film as photoanode was synthesized for photoelectrocatalytic (PEC) reduction of CO2 into formic acid (HCOOH). The films prepared by doctor blade method were characterized with X-ray diffractometer (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The existence of oxygen vacancies in the WO3?x was confirmed with an X-ray photoelectron spectroscopy (XPS), and the accurate oxygen index was determined by a modified potentiometric titrimetry method. After 3 h of photoelectrocatalytic reduction, the formic acid yield of the WO3?x/TiO2 film is 872 nmol/cm2, which is 1.83 times that of the WO3/TiO2 film. The results of PEC performance demonstrate that the introduction of WO3?x nanoparticles can improve the charge transfer performance so as to enhance the performance of PEC reduction of CO2 into formic acid.
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