Retarded Charge Recombination to Enhance Photocatalytic Performance for Water-Free CO2Reduction Using Perovskite Nanocrystals as Photocatalysts

Sudhakar Narra, Sumit S. Bhosale, Aparna K. Kharade, Sue-Min Chang, Eric Wei Guang Diau*

*此作品的通信作者

研究成果: Article同行評審

2 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)9134-9139
頁數6
期刊Journal of Physical Chemistry Letters
13
發行號39
DOIs
出版狀態Published - 6 10月 2022

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