WO3光催化分解水析氧活性
( 1. 中南大学 化学化工学院， 长沙 410083；
2. 景德镇陶瓷学院 材料科学与工程学院， 景德镇 333001)
摘 要: 在不同组成O2/Ar混合气体条件下， 于700 ℃将仲钨酸铵加热分解制备WO3催化剂。 采用XRD、 XPS、 DRS等技术对催化剂进行表征， 考察催化剂在电子接受体Fe3+溶液体系下的光催化分解水析氧活性。 结果表明： Ar含量增大， WO3催化剂表面氧空位增加， 光催化析氧活性增大， 纯Ar条件下所得的WO3催化剂光催化析氧活性最高。 研究了Fe2+对光催化分解水析氧活性的影响， 在Fe3+离子作为电子接受体的光催化分解水析氧反应中， 一定浓度的Fe2+离子能明显抑制WO3的析氧活性， 当Fe2+离子和Fe3+离子的浓度相当时， WO3催化剂完全失去光催化析氧活性。
关键字: WO3； O2/Ar气氛； 氧空位； 光催化； 分解水
（ 1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333001, China）
Abstract: A series of WO3 catalysts were obtained through pyrolysis of ammonium paratungstate under different O2/Ar at 700 ℃. The catalysts were identified by XRD, XPS, DRS measurements, and the photocatalytic activity of WO3 for O2 evolution was studied. The results indicate that with the increasing content of Ar, the oxygen vacancies of WO3 catalysts are increased, the photocatalytic activity for O2 evolution is advanced and the photocatalytic activity of WO3 obtained in pure Ar is the highest. The influence of Fe2+ on photocatalytic activity for O2 evolution was also investigated. The results show that the activity of WO3 is restrained by Fe2+ in the photocatalytic reaction with Fe3+ as electron acceptor.
Key words: WO3; O2/Ar atmosphere; oxygen vacancy; photocatalytic; water splitting
