1. Northwest Normal Univ, Coll Phys & Elect Engn, Key Lab Atom & Mol Phys & Funct Mat Gansu Prov, Lanzhou 730070, Peoples R China
2. Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Oxo Synth & Select Oxidat, Lanzhou 730000, Peoples R China
折叠
Abstract
Photocatalytic visible water splitting is still impeded by slow kinetics of multi-electron-driven water oxidation, fast carrier recombination and insufficient light absorption of the photocatalyst. Herein, the core-shell heterojunction BxGa1_xAs/GaAs photocatalyst exhibited a remarkably promoted activity for hydrogen generation by direct dissociation of water molecule over boron site on catalyst surface due to redistributing electron density, as well as by promotion of visible absorption and acceleration of charge separation and transfer via a built-in electric field. B0.25Ga0.75As/GaAs photocatalyst exhibited hydrogen evolution rate of 8.4 mu mol during 8 h from pure water without electron donor and applied bias.
Key words
Boron substitution/Energy barrier of the water dissociation/Heterojunction interface/Built-in electric field/Core-shell BxGa1 As-x/GaAs photocatalyst
NSTL
Elsevier