WC/TiO2纳米复合材料晶相形成机理及电催化性能  

Crystal phase formation mechanism and electrocatalytical properties of WC/TiO_2 nanocomposites

作　　者：王晓娟[1,2,3] 毛信表[2] 李国华[2] 马淳安[2] 

机构地区：[1]宁波检验检疫科学技术研究院,浙江宁波315012 [2]浙江工业大学化学工程与材料学院,绿色化学合成技术国家重点实验室培育基地,浙江杭州310032 [3]宁波出入境检验检疫局,浙江宁波315012

出　　处：《化工学报》2016年第11期4873-4877,共5页CIESC Journal

基　　金：宁波市自然科学基金项目(2014A610116);国家质量监督检验检疫总局科技计划项目(2015IK183);绿色化学合成技术国家重点实验室培育基地开放研究基金项目(GCTKF2014004)

摘　　要：以金红石相纳米TiO_2为载体,偏钨酸铵为钨源,采用表面修饰技术制备了纳米复合材料的前体,将前体在甲烷/氢气气氛下还原碳化并采用XRD对其进行表征,研究了还原碳化温度、时间对纳米复合材料晶相组成的影响,并探讨了WC/TiO_2纳米复合材料的形成机理。通过扫描电子显微镜、热重-差热分析等手段对WC/TiO_2纳米复合材料的形态结构和热稳定性进行了表征。采用循环伏安法研究了纳米复合材料物相组成与电催化性能之间的关系,结果表明由WC和TiO_2两相组成的WC/TiO_2纳米复合材料对对硝基苯酚电还原反应的电催化性能最佳。Tungsten carbide and titania（WC/TiO2） nanocomposites were fabricated by surface modification of rutile titania reacting with ammonium metatungstate and followed by in situ reduction and carburization of the modified rutile in CH4/H2 atmosphere. The influence of temperature and time of in situ reduction and carburization on phase structures of WC/TiO2 nanocomposites were investigated by XRD characterization on nanocomposites, and the formation mechanism of crystal phases in WC/TiO2 nanocomposites was discussed. The morphology and thermal stability of WC/TiO2 nanocomposites were studied by SEM and TG-DTA, respectively. Electrocatalytical properties of the WC/TiO2 nanocomposites with different phase structures were investigated by cyclic voltammetry. Results showed that WC/TiO2 nanocomposites composed of both WC and TiO2 crystal phase exhibited the best catalytic activity for p-nitrophenol（PNP） electroreduction.

关 键 词：碳化钨 二氧化钛 复合材料 制备 对硝基苯酚 电化学 

分 类 号：O646[理学—物理化学]