Formation of a p-n heterojunction photocatalyst by the interfacing of graphitic carbon nitride and delafossite CuGaO2

Benjamin Martinez, Dai Ning Chang, Yu Cheng Huang, Chung Li Dong, Te Wei Chiu, Ming Hsi Chiang*, Chun Hong Kuo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Photocatalysts have focused on scientific endeavors for five decades already. Their ability to generate solar fuel via relatively environmentally benign processes brings promises of a future with increasingly sustainable energy production. A class of materials, heterojunction (HJ) semiconductors, have immense potential due to their versatility, stability, and cost-effectiveness. In addition, meticulous engineering of p-n HJ enables the apparition of an electric field at the junction, a supplementary driving force that drives the charge carriers to separate effectively upon illumination. Therefore, we combined n-type carbon nitride with p-type CuGaO2 to form a photo-active p-n HJ. Mechanistic insights being highly sought-after, we then employed X-ray photoelectron spectroscopy and X-ray absorption spectroscopy as complementary and orbital-specific techniques to probe the changes caused by interfacing CuGaO2 with g-C3N4.

Original languageEnglish
Pages (from-to)1042-1050
Number of pages9
JournalJournal of the Chinese Chemical Society
Volume69
Issue number7
DOIs
StatePublished - Jul 2022

Keywords

  • charge transfer
  • hydrogen
  • p-n heterojunction
  • water splitting
  • XAS
  • XPS

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