Construction of Heterostructured Sn/TiO2/Si Photocathode for Efficient Photoelectrochemical CO2 Reduction
Journal
ChemSusChem
Journal Volume
15
Journal Issue
8
Date Issued
2022
Author(s)
Abstract
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. © 2022 Wiley-VCH GmbH.
Subjects
CO2 reduction; formic acid; photocathode; photoelectrochemistry; Sn/TiO2/Si
Other Subjects
Carbon dioxide; Electrochemistry; Formic acid; Light absorption; Silicon wafers; Surface plasmon resonance; Tin; Absorption performance; CO 2 reduction; Liquid products; Photo-electrochemistry; Photocathode; Photoelectrochemicals; Renewable energies; Si wafer; Sn/TiO2/si; TiO 2 layer; Titanium dioxide
Type
journal article