新型WO3-x/TiO2薄膜光阳极光电催化还原CO2制备甲酸

采用刮涂法制备一种新型光阳极WO3-x/TiO2薄膜,并对其进行光电催化还原CO2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WO3-x中存在氧空位,并通过电位滴定法精确测定WO3-x中的氧指数。光电催化还原CO2 3h后,WO3-x/TiO2薄膜光阳极的甲酸产量为872nmol/cm^2,是WO3/TiO2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CO2活性,故WO3-x/TiO2薄膜光阳极相对WO3/TiO2具有更好的光电催化还原活性。...

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Published in中国有色金属学报：英文版 Vol. 26; no. 9; pp. 2390 - 2396
Main Author 杨亚辉 解人瑞 黎航 刘灿军 刘文华 占发琦
Format Journal Article
LanguageEnglish
Published 2016
Subjects
CO2
TiO2
WO3-x
光电催化还原
甲酸
薄膜光阳极
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Summary:采用刮涂法制备一种新型光阳极WO3-x/TiO2薄膜,并对其进行光电催化还原CO2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WO3-x中存在氧空位,并通过电位滴定法精确测定WO3-x中的氧指数。光电催化还原CO2 3h后,WO3-x/TiO2薄膜光阳极的甲酸产量为872nmol/cm^2,是WO3/TiO2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CO2活性,故WO3-x/TiO2薄膜光阳极相对WO3/TiO2具有更好的光电催化还原活性。
Bibliography:A novel WO3-x/TiO2 film as photoanode was synthesized for photoelectrocatalytic（PEC） reduction of CO2 into formic acid（HCOOH）. The films prepared by doctor blade method were characterized with X-ray diffractometer（XRD）, scanning electron microscope（SEM） and transmission electron microscope（TEM）. The existence of oxygen vacancies in the WO3-x was confirmed with an X-ray photoelectron spectroscopy（XPS）, and the accurate oxygen index was determined by a modified potentiometric titrimetry method. After 3h of photoelectrocatalytic reduction, the formic acid yield of the WO3-x/TiO2 film is 872 nmol/cm^2, which is 1.83 times that of the WO3/TiO2 film. The results of PEC performance demonstrate that the introduction of WO3-x nanoparticles can improve the charge transfer performance so as to enhance the performance of PEC reduction of CO2 into formic acid.
43-1239/TG
photoelectrocatalytic reduction; CO2; formic acid; WO3-x; TiO2; film photoanode
Ya-hui YANG1,Ren-rui XIE1,Hang LI1,Can-jun LIU2,Wen-hua LIU2,Fa-qi ZHAN2（ 1. College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China; 2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
ISSN:1003-6326