TY - JOUR
T1 - Enhanced CO2 conversion on highly-strained and oxygen-deficient BiVO4 photocatalyst
AU - Akrami, Saeid
AU - Murakami, Yasushi
AU - Watanabe, Monotori
AU - Ishihara, Tatsumi
AU - Arita, Makoto
AU - Guo, Qixin
AU - Fuji, Masayoshi
AU - Edalati, Kaveh
N1 - Funding Information:
This work is supported in part by the WPI-I2CNER, Japan, and in part by a Grants-in-Aid for Scientific Research on Innovative Areas from the MEXT, Japan (JP19H05176 & JP21H00150).
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/8/15
Y1 - 2022/8/15
N2 - Bismuth vanadate (BiVO4) has recently received significant attention for photocatalytic CO2 conversion due to its low bandgap and high stability, but low position of the conduction band and high electron-hole recombination rate limit its photocatalytic activity. In this study, to overcome the drawbacks of BiVO4, oxygen vacancies and lattice strain are simultaneously introduced in this oxide using a high-pressure torsion process. The processed material not only shows the low recombination rate and enhanced conduction band level but also exhibits bandgap narrowing. The oxygen-deficient and highly-strained BiVO4 shows a high photocatalytic CO2 conversion rate with an activity comparable to the P25 TiO2 photocatalyst. The enhancement of photocatalytic activity is discussed based on the modification of band structure, enhanced light absorbance, the lifetime of excited electrons, and the role of oxygen vacancies as activation sites for CO2 photoreduction. This work introduces a feasible pathway to develop active photocatalysts for CO2 conversion by lattice strain and defect engineering.
AB - Bismuth vanadate (BiVO4) has recently received significant attention for photocatalytic CO2 conversion due to its low bandgap and high stability, but low position of the conduction band and high electron-hole recombination rate limit its photocatalytic activity. In this study, to overcome the drawbacks of BiVO4, oxygen vacancies and lattice strain are simultaneously introduced in this oxide using a high-pressure torsion process. The processed material not only shows the low recombination rate and enhanced conduction band level but also exhibits bandgap narrowing. The oxygen-deficient and highly-strained BiVO4 shows a high photocatalytic CO2 conversion rate with an activity comparable to the P25 TiO2 photocatalyst. The enhancement of photocatalytic activity is discussed based on the modification of band structure, enhanced light absorbance, the lifetime of excited electrons, and the role of oxygen vacancies as activation sites for CO2 photoreduction. This work introduces a feasible pathway to develop active photocatalysts for CO2 conversion by lattice strain and defect engineering.
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U2 - 10.1016/j.cej.2022.136209
DO - 10.1016/j.cej.2022.136209
M3 - Article
AN - SCOPUS:85127813680
SN - 1385-8947
VL - 442
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 136209
ER -