Large-Area CVD MoS2/WS2 Heterojunctions as a Photoelectrocatalyst for Salt-Water Oxidation
Peter C Sherrell, Pawel Palczynski, Maria S Sokolikova, Francesco Reale, Federico M Pesci, Mauro Och, Cecilia Mattevi
ACS Applied Energy Materials | American Chemical Society | Published : 2019
Splitting salt water via sunlight into molecular oxygen and hydrogen for use as fuel or as an energy carrier is a clear pathway toward renewable energy. Monolayer MoS2 and WS2 are promising materials for the energetically demanding water oxidation reaction, absorbing ∼10% of incident light in the visible spectrum and possessing chemical stability and band edges more positive than the oxidation potential of water. A heterostructure of MoS2/WS2 forms a type-II heterojunction, supporting fast separation of the photogenerated charge carriers across the junction. Here, we show the role played by defects in determining the efficiency of the photon-driven oxidation process. By reducing the defects ..View full abstract
Awarded by EPSRC
Awarded by EPSRC-Royal Society
Awarded by Research Fellows Enhancement Award
The authors would like to thank Dr. Ecaterina Ware for the preparation of the TEM lamella via FIB. The authors acknowledge the use of the characterization facilities within the Harvey Flower Electron Microscopy Suite and the X-Ray Diffraction Suite of the Department of Materials, Imperial College London. M.S.S. would like to acknowledge the President's Ph.D. Scholarship programme at the Imperial College London for financial support. C.M. would like to acknowledge the EPSRC awards, EP/K01658X/1, EP/K016792/1, EP/M022250/1, the EPSRC-Royal Society Fellowship Engagement Grant EP/L003481/1, the Research Fellows Enhancement Award 2017 RGF \EA\180090, and the award of a Royal Society University Research Fellowship by the U.K. Royal Society.