Photocatalytic CO 2 ‐to‐CH 4 Conversion with Ultrahigh Selectivity of 95.93% on S‐Vacancy Modulated Spatial In 2 S 3 /In 2 O 3 Heterojunction

Abstract Photocatalytic conversion of CO 2 to methane faces challenges due to the stability of CO 2 , unpredictable intermediates, and complex electron transfer steps. Herein, a spatial In 2 S 3 /In 2 O 3 heterojunction with abundant S vacancies (ISIO(V S )) is obtained through facile Polyvinylpyrrolidone (PVP) treatment to reach a methane yield of 16.52 µmol·g −1 ·h −1 with a selectivity of 95.93%, which is the highest among reported In 2 S 3 and In 2 O 3 based catalysts. The work function ( W f ), differential charge density, and Kelvin Probe Force Microscopy (KPFM) results confirm that S vacancies strengthen the built‐in electric field (BEF) of In 2 S 3 /In 2 O 3 (ISIO) heterojunctions, improving carrier…

• AG
  Australian Government

  Award: CRCPXIII000077
• EC
  European Commission
• RU
  RMIT University
• NN
  National Natural Science Foundation of China

  Awards: 21003157, 21273285, 51572295
• AR
  Australian Renewable Energy Agency
• AR
  Australian Research Council

  Award: FT210100298
• NK
  National Key Research and Development Program of China

  Awards: 2021YFA1501300, 2019YFC1907602