Pd4S3Se3, Pd4S3Te3, and Pd4Se3Te3: Candidate Two-Dimensional Janus Materials for Photocatalytic Water Splitting
KAUST DepartmentComputational Physics and Materials Science (CPMS)
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Online Publication Date2021-05-17
Print Publication Date2021-06-08
Embargo End Date2022-05-17
Permanent link to this recordhttp://hdl.handle.net/10754/669408
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AbstractThe anisotropic Janus materials Pd4S3Se3, Pd4S3Te3, and Pd4Se3Te3 are demonstrated to be stable based on the cohesive energy, the phonon spectrum, and ab initio molecular dynamics simulation. They are semiconductors with indirect band gaps of 1.25, 0.78, and 1.32 eV, respectively, and exhibit ultrahigh carrier mobilities of up to 9455 cm2 V–1 s–1. Band edges enclosing the redox potentials of water enable photocatalytic water splitting. Importantly, the large intrinsic electric fields of the Janus structures facilitate the migration of photo-generated carriers, which enhances the carrier utilization and, therefore, the solar-to-hydrogen efficiency. The obtained efficiencies of 30.1% for Pd4S3Se3, 38.6% for Pd4S3Te3, and 23.8% for Pd4Se3Te3 surpass the conventional theoretical limit of 18%. In addition, the materials are predicted to catalyze the hydrogen and oxygen evolution reactions. Application potential is identified in electronics, optoelectronics, and photocatalytic water splitting.
CitationLuo, Y., Sun, M., Yu, J., & Schwingenschlögl, U. (2021). Pd4S3Se3, Pd4S3Te3, and Pd4Se3Te3: Candidate Two-Dimensional Janus Materials for Photocatalytic Water Splitting. Chemistry of Materials. doi:10.1021/acs.chemmater.1c00812
SponsorsWe gratefully acknowledge funding from the Scientific Research Foundation of the Graduate School of Southeast University. The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).
PublisherAmerican Chemical Society (ACS)
JournalChemistry of Materials