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You have full access to this open access article. The as-prepared photoanodes show dramatically enhanced performance for photoelectrochemical PEC water splitting, compared to single semiconductor counterparts.
After pairing with ZnO, the NSAs exhibit a broadened absorption range and an increased light absorptance over a wide wavelength region of — nm. RHE and an incident photon-to-current efficiency of Photoelectrochemical PEC water splitting is regarded as one of the most attractive approaches for producing hydrogen in a clean, renewable, and eco-friendly manner to store solar energy, which has aroused significant interest in the recent years [ 1 , 2 , 3 , 4 , 5 ]. To efficiently convert the abundant solar energy into a storable and high-energy—density chemical energy, H 2 , it is desirable to pursue and design a suitable semiconductor photoelectrode satisfying the stringent requirements of wide-range absorption, high carrier mobility, long carrier lifetime, and high stability [ 6 , 7 ].
However, there is no single one material that can satisfy all the aforementioned requirements among more than about types of semiconductor materials [ 6 ]. To address these challenges, nanostructured architectures have been explored because of their various advantages compared to bulk materials [ 8 , 9 , 10 , 11 ]. Alongside the recent population of graphene, two-dimensional 2D nanostructures, such as nanosheets, nanoplates, and nanoflakes, especially vertical nanoarray structures, are of special interest in artificial photosynthesis owing to their unique mechanical, physical, and chemical properties, as well as extremely large surface areas [ 12 , 13 , 14 ].
Among the known nanostructured semiconductors, metal chalcogenides have attracted substantial attention as a group of highly efficient photocatalysts for PEC water splitting [ 15 ]. As one of the most important III—VI chalcogenides, indium sulfide In 2 S 3 has been well studied for its applications in photocatalysts, solar cells, and other optoelectronic devices [ 16 , 17 , 18 , 19 , 20 ]. As an efficient strategy for improving the PEC conversion efficiency, elemental doping Co and Zr has been adopted to modify the electronic structure of 2D In 2 S 3 nanocrystals as photocatalysts [ 23 , 26 ].
