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采用刮涂法制备一种新型光阳极WO_(3-x)/TiO_2薄膜,并对其进行光电催化还原CO_2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WO_(3-x)中存在氧空位,并通过电位滴定法精确测定WO_(3-x)中的氧指数。光电催化还原CO_2 3h后,WO_(3-x)/TiO_2薄膜光阳极的甲酸产量为872nmol/cm2,是WO_3/TiO_2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CO_2活性,故WO_(3-x)/TiO_2薄膜光阳极相对WO_3/TiO_2具有更好的光电催化还原活性。
A novel photoanode WO_ (3-x) / TiO_2 thin film was prepared by the knife coating method, and its photocatalytic reduction of CO_2 to formic acid was carried out. The photoanode films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The presence of oxygen vacancies in WO_ (3-x) was confirmed by XPS and the oxygen index in WO_ (3-x) was accurately determined by potentiometric titration. The photoacid production of WO_ (3-x) / TiO_2 photoanode at 872nmol / cm2 after photoelectrocatalytic reduction of CO_2 for 3h was 1.83 times that of WO_3 / TiO_2 photoanode. Photoelectrochemical tests showed that photocatalytic activity of WO_ (3-x) / TiO_2 thin film photocathode was better than that of WO_3 / TiO_2 due to the increase of charge transport properties due to the presence of oxygen vacancies and the enhancement of CO_2 activity.