Photoelectrocatalytic reduction of CO₂ into formic acid using WO_3-x/TiO₂ film as novel photoanode

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• 作者：Ya-hui YANG^a ; ^{yangyahui2002@sina.com" class="auth_mail" title="E-mail the corresponding author} ; Ren-rui XIE^a ; Hang LI^a ; Can-jun LIU^b ; Wen-hua LIU^b ; Fa-qi ZHAN^b
• 关键词：photoelectrocatalytic reduction ; CO2 ; formic acid ; WO3&ndash ; x ; TiO2 ; film photoanode
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：26
• 期：9
• 页码：2390-2396
• 全文大小：2533 K

文摘

A novel WO_3–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 WO_3–x was confirmed with an X-ray photoelectron spectroscopy (XPS), and the accurate oxygen index was determined by a modified potentiometric titrimetry method. After 3 h of photoelectrocatalytic reduction, the formic acid yield of the WO_3–x/TiO₂ film is 872 nmol/cm², which is 1.83 times that of the WO₃/TiO₂ film. The results of PEC performance demonstrate that the introduction of WO_3–x nanoparticles can improve the charge transfer performance so as to enhance the performance of PEC reduction of CO₂ into formic acid.