导电玻璃负载CuO/V_2O_5复合纳米纤维光电极的制备及光电催化性能

Preparation and Photoelectrocatalytic Performance of CuO/V_2O_5/FTO Composite Nanofibers Electrode

以聚乙烯吡咯烷酮(PVP)为高分子模板剂,乙酰丙酮钒(C_(15)H_(21)O_6V)和三水合硝酸铜[Cu(NO_3)_2·3H_2O]为原料,导电玻璃(FTO)为载体,结合溶胶-凝胶法和静电纺丝技术制备了前驱体纤维,经高温焙烧后得到分布均匀、具有纤维结构的导电玻璃负载的CuO/V_2O_5复合光电极(CuO/V_2O_5/FTO).采用热重-差热分析仪(TG-DTA)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和X射线光电子能谱仪(XPS)等对材料的结构进行表征,以亚甲基蓝(MB)为目标降解物,探讨了合成产物的光电催化性能.结果表明,CuO与V_2O_5能有效形成异质结构,其光电催化活性均比纯V_2O_5有明显提高,并且改变CuO与V_2O_5的比例对光电催化性能有较大影响,其中n(Cu)∶n(V)=1∶1时降解效率最高,达到96%.

CuO/V2O5/FTO composite nanofibers photoelectrode was fabricated by electrospinning method with polyvinyl pyrrolidone（PVP） as fiber skeleton,copper（Ⅱ） nitrate hydrate and vanadium（Ⅳ）-oxy acetylacetonate as raw materials. The structure of the samples was characterized by thermogravimetry- differential thermal analysis（TG-DTA）,X-ray diffraction（XRD）,scanning electron microscopy（SEM）,transmission electronic microscopy（TEM） and X-ray photoelectron spectroscopy（XPS）. The photoelectrocatalytic performance of the samples was analyzed by the degradation of methylene blue（MB） solution. The results show that the heterojunctions between CuO and V2O5 were formed,and the separation of photogenerated electron-hole pairs on CuO/V2O5/FTO was promoted,which made the degradation rate of MB catalyzed by CuO/V2O5/FTO much higher than that catalyzed by pure V2O5/FTO. The different molar ratios of n（Cu）/n（V） had influence on photoelectrocatalytic activity,and the CuO/V2O5/FTO with n（Cu）/n（V） = 1 ∶ 1 had the highest catalytic activity（degradation rate of MB was 96%）.