WO3光催化分解水析氧活性
( 1. 中南大學(xué) 化學(xué)化工學(xué)院， 長(zhǎng)沙 410083；
2. 景德鎮(zhèn)陶瓷學(xué)院 材料科學(xué)與工程學(xué)院， 景德鎮(zhèn) 333001)
摘 要: 在不同組成O2/Ar混合氣體條件下， 于700 ℃將仲鎢酸銨加熱分解制備WO3催化劑。 采用XRD、 XPS、 DRS等技術(shù)對(duì)催化劑進(jìn)行表征， 考察催化劑在電子接受體Fe3+溶液體系下的光催化分解水析氧活性。 結(jié)果表明： Ar含量增大， WO3催化劑表面氧空位增加， 光催化析氧活性增大， 純Ar條件下所得的WO3催化劑光催化析氧活性最高。 研究了Fe2+對(duì)光催化分解水析氧活性的影響， 在Fe3+離子作為電子接受體的光催化分解水析氧反應(yīng)中， 一定濃度的Fe2+離子能明顯抑制WO3的析氧活性， 當(dāng)Fe2+離子和Fe3+離子的濃度相當(dāng)時(shí)， WO3催化劑完全失去光催化析氧活性。
關(guān)鍵字: WO3； O2/Ar氣氛； 氧空位； 光催化； 分解水
ZHOU Jian-liang1, LI Jie1
（ 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
