Construction of Heterostructured Sn/TiO2/Si Photocathode for Efficient Photoelectrochemical CO2 Reduction

Chengjin Li, Xiaoxia Zhou, Qingming Zhang, Yi Xue, Zhaoyu Kuang, Han Zhao, Chung Yuan Mou, Hangrong Chen

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Using renewable energy to convert CO2 into liquid products, as a sustainable way to produce fuels and chemicals, has attracted intense attention. Herein, a novel heterostructured photocathode composed of Si wafer, TiO2 layer, and Sn metal particles has been successfully fabricated by combining of a facile hydrothermal and electrodeposition method. The obtained Sn/TiO2/Si photocathode shows enhanced light absorption performance by the surface plasmon resonance effect of Sn metal. Especially, the Sn/TiO2/Si photocathode together with rich oxygen vacancy defects jointly promote photoelectrochemical CO2 reduction, harvesting a high faradaic efficiency of HCOOH and a desirable average current density (−4.72 mA cm−2) at −1.0 V vs. reversible hydrogen electrode. Significantly, the photocathode Sn/TiO2/Si also shows good stability due to the design of protecting layer TiO2. This study provides a facile strategy of constructing an efficient photocathode to improve the light absorption performance and the electron transfer efficiency, exhibiting great potential in the CO2 reduction.

Original languageEnglish
Article numbere202200188
Issue number8
Publication statusPublished - Apr 22 2022
Externally publishedYes


  • CO reduction
  • formic acid
  • photocathode
  • photoelectrochemistry
  • Sn/TiO/Si

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemical Engineering(all)
  • Materials Science(all)
  • Energy(all)


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