Anisotropic Janus SiP₂ Monolayer as a Photocatalyst for Water Splitting.

ABSTRACT: The design of materials meeting the rigorous requirements of photocatalytic water splitting is still a challenge. Anisotropic Janus 2D materials exhibit great potential due to outstandingly high photocatalytic efficiency. Unfortunately, these materials are scarce. By means of ab initio swarm-intelligence search calculations, we identify a SiP₂ monolayer with Janus structure (i.e., out-of-plane asymmetry). The material turns out to be semiconducting with an indirect band gap of 2.39 eV enclosing the redox potentials of water. Notably, the oxygen and hydrogen evolution half reactions can happen simultaneously at the Si and P atoms, respectively, driven merely by the radiation-induced electrons and holes. The carrier mobility is found to be anisotropic and high, up to 10^-4

SUBMITTER: Yu T 

PROVIDER: S-EPMC8041313 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature