A highly -textured Sb2Se3 photocathode for efficient photoelectrochemical water reduction†
Anisotropic Sb2Se3 is an emerging earth-abundant photocathode for photoelectrochemical water splitting. However, controlling the growth of the Sb2Se3 film with optimal  crystallographic orientation is still the most challenging issue. Here, we successfully synthesized -oriented Sb2Se3via a reliable and facile method. The -oriented Sb2Se3 film could provide an excellent carrier-migration efficiency. Consequently, we achieved a record-high photocurrent density of −20.2 mA cm−2 at 0 VRHE and a very high half-cell solar-to-hydrogen efficiency of 1.36% under 1-sun simulated solar illumination in a TiO2/-Sb2Se3 photocathode. This work provides an effective strategy and important guidelines for rationally designing optoelectronic devices based on the -oriented Sb2Se3 film.