Enhanced hydrogen evolution activity of CsPbBr₃ nanocrystals achieved by dimensionality change

Dimensionality plays a vital role at the nanoscale in tuning the electronical and photophysical properties and surface features of perovskite nanocrystals. Here, 3D and 1D all-inorganic CsPbBr₃ nanocrystals were chosen as model materials to systemically reveal the dimensionality-dependent effect in photocatalytic H₂ evolution. In terms of facilitating photoinduced electron-hole pair separation and charge transfer, as well as inducing proton reduction potential with the presence of fewer Br vacancies, 1D CsPbBr₃ nanorods gave about a 5-fold improvement for solar H₂ evolution.