Enriching surface- ordered defects on WO3 for photocatalytic CO2-to-CH4 conversion by water

• 成果类型: Article
• 署名作者: Xue, Sikang; Wei, Changgeng; Shen, Min; Liang, Xiaocong; Wang, Jiali; Yang, Can; Xing, Wandong; Wang, Sibo; Lin, Wei; Yu, Zhiyang; Hou, Yidong; Yu, Jimmy C.; Wang, Xinchen
• 署名单位: Fuzhou University; Fuzhou University; Chinese University of Hong Kong
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-14923
• DOI: 10.1073/pnas.2319751121
• 发表日期: 2024-04-30
• 关键词: selective co2 photoreduction; total-energy calculations; carbon-dioxide; reduction; efficient; activation; sites; pairs; tio2

摘要

Defect engineering has been widely applied in semiconductors to improve photocatalytic properties by altering the surface structures. This study is about the transformation of inactive WO 3 nanosheets to a highly effective CO 2 - to - CH 4 conversion photocatalyst by introducing surface - ordered defects in abundance. The nonstoichiometric WO 3 - x samples were examined by using aberration - corrected electron microscopy. Results unveil abundant surface - ordered terminations derived from the periodic {013} stacking faults with a defect density of 20.2%. The {002} surface - ordered line defects are the active sites for fixation CO 2 , transforming the inactive WO 3 nanosheets into a highly active catalyst (CH 4 : O 2 = 8.2: 16.7 mu mol h -1 ). We believe that the formation of the W - O - C - W - O species is a critical step in the catalytic pathways. This work provides an atomic - level comprehension of the structural defects of catalysts for activating small molecules.