One-step heating hydrothermal of iridium-doped cubic perovskite strontium titanate towards hydrogen evolution

•Low-temperature hydrothermal synthesis of Ir-doped SrTiO3 nano cubes.•Enhancing photocatalytic activity with low Iridium content (1 wt%).•High hydrogen evolution rate up to 1376 μmol.g−1.h−1 under ultraviolet.