Publication date: 15th December 2025
Lead-free halide perovskites have several advantages over lead-based ones such as much lower toxicity and higher ambient stability. However, they are usually much less stable under the conditions of photocatalytic CO2 reduction. Moreover, their charge generation is usually somewhat inefficient due to the lack of catalytically active sites. In this work, space-confined nanocrystals of stable Cs3Bi2X9 (X = Br, I) were synthesized in the pores of SiO2 mesoporous matrices [1] and tested in solid/gas photocatalytic CO2 conversion. We will discuss the properties of the confined perovskites and their influence on the photocatalytic performance.
A combined experimental/theoretical study highlights an unprecedented CH4 production yield achieved. Coupled with a very high selectivity of >80%, it makes these materials one of the best among all halide perovskite photocatalysts for CH4 production. We will discuss and compare the performance of different confined bismuth halide perovskites, bulk perovskite powders, as well as the size of the pores and the effect of the confinement. We will show that the unique combination of the increased density of active surface sites and high concentration of reactant molecules around nanocrystals in the pores are at the origin of the high performance and selectivity.
Other types of confined perovskites and other photocatalyses, such as organic tranformations, will be equally discussed.
This project has received financial support from the French National Research Agency (grant ANR EncaPer ANR-23-CE09-0013-01).
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