Self-Photocatalytic Splitting of Carbon Dioxide Using Co-cationic Perovskite Nanocrystals in the Absence of Water

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

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Environmental concerns demand efficient removal of CO2, a major greenhouse gas. For this purpose, a traditional chemical strategy implements a catalytic conversion of CO2 to CO, with H2O as the sacrificial agent to generate O2. Herein we report the first self-photocatalytic conversion of CO2 to generate CO and O2 in the absence of H2O, using co-cationic perovskite nanocrystal Cs0.55FA0.45PbBr3. We obtained a record production rate 105 μmol g-1 h-1 of CO, which is three times that with CsPbBr3 as photocatalyst at the gas-solid interface. During photocatalytic reaction, a phase transition occurred with an enlarged crystal size through the effect of Ostwald ripening, for which the CO yield approached 3.1 mmol g-1 within the reaction period of ∼60 h. During this process, both FA and oleylammonium cations were released to provide the proton source for the CO2 reduction to proceed and generate hydroxyl species required for oxidation. A self-photocatalysis mechanism involving bound hydroxyls is proposed.

Original languageEnglish
Pages (from-to)280-288
Number of pages9
JournalACS Energy Letters
DOIs
StateAccepted/In press - 2022

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