An efficient and stable solar flow battery enabled by a single-junction GaAs photoelectrode.

This research is supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research under award No. OSR-2017-CRG6-3453.02. C.H.L. and J.H.H. are supported by the KAUST baseline fund for the design and fabrication of the single-junction GaAs cells. The authors thank Mr. Hongyuan Sheng for performing the XPS analysis on the GaAs photoelectrodes.