Publication date: 15th December 2025
Halide perovskites (HPs) are currently the most attractive photoactive materials for triggering solar–driven photo(electro)chemical (PEC) reactions, involving fuel and energy generation. However, the fast deterioration of HPs into polar solvents limits their applicability making the protective layers or the use of non–polar systems, pivotal strategies to keep stable their intrinsic features and structural integrity. Here, the ligand engineering concept is introduced using diverse bulky alkylammonium bromide (AlkylBr) molecules with the purpose of promoting the surface passivation of HPs, avoiding the permeation of polar molecules such as alcohols and inducing their partial ionization for producing alkoxide species, suitable for perovskite protection. In this context, high–quality AlkylBr–capped 3D CsPbX3 nanocrystals are stable in this polar media up to 7300 h (10 months), retaining a PL quantum yield of 100%.[1,2] Accordingly, these photomaterials demonstrate a highly oxidizing power to carry out the PEC methanol-to-formaldehyde conversion with a Faradaic efficiency ~60%. Furthermore, by applying composition engineering, lead-free 2D A2SnX4 microcrystals with band-to-band emission are stabilized in aqueous environments, promoting hydrogen production ~20 μmol.g-1, a photocurrent ~ 1 mAcm-2 and a operational durability up to 2000 s. These features make HPs prominent candidates for the fabrication of advanced Solar-PEC technologies.
AFG-R acknowledges to ANID through Fondecyt Iniciación Project 11240161.
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