TY - JOUR
T1 - Retarded Charge Recombination to Enhance Photocatalytic Performance for Water-Free CO2Reduction Using Perovskite Nanocrystals as Photocatalysts
AU - Narra, Sudhakar
AU - Bhosale, Sumit S.
AU - Kharade, Aparna K.
AU - Chang, Sue Min
AU - Diau, Eric Wei Guang
N1 - Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.
PY - 2022/10/6
Y1 - 2022/10/6
N2 - Femtosecond transient absorption spectral (TAS) investigations were performed to understand the carrier relaxation mechanism for perovskite nanocrystals Cs1-xFAxPbBr3(CF, x = 0.45) and CsPbBr3(CS), which served as efficient photocatalysts for splitting of CO2into CO and O2in the absence of water. Upon light irradiation for 12 h, formation of deep trap states was found for both CS and CF samples with spectral characteristics of the TAS photobleach (PB) band showing a long spectral tail extending to the long wavelength region. The charge recombination rates at the shallow surface states, bulk states, and deep-trapped surface state were found to be significantly retarded for the CF sample than for the CS sample, in agreement with the photocatalytic performances for CO product yields of the CF catalyst being greater by a factor of 3 compared to those of the CS catalyst.
AB - Femtosecond transient absorption spectral (TAS) investigations were performed to understand the carrier relaxation mechanism for perovskite nanocrystals Cs1-xFAxPbBr3(CF, x = 0.45) and CsPbBr3(CS), which served as efficient photocatalysts for splitting of CO2into CO and O2in the absence of water. Upon light irradiation for 12 h, formation of deep trap states was found for both CS and CF samples with spectral characteristics of the TAS photobleach (PB) band showing a long spectral tail extending to the long wavelength region. The charge recombination rates at the shallow surface states, bulk states, and deep-trapped surface state were found to be significantly retarded for the CF sample than for the CS sample, in agreement with the photocatalytic performances for CO product yields of the CF catalyst being greater by a factor of 3 compared to those of the CS catalyst.
UR - http://www.scopus.com/inward/record.url?scp=85139206905&partnerID=8YFLogxK
U2 - 10.1021/acs.jpclett.2c02393
DO - 10.1021/acs.jpclett.2c02393
M3 - Article
C2 - 36165800
AN - SCOPUS:85139206905
SN - 1948-7185
VL - 13
SP - 9134
EP - 9139
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 39
ER -