P-N depleted bulk BiOBr/α-FeO heterojunctions applied for unbiased solar water splitting.

P-N depleted bulk BiOBr/α-FeO heterojunction (DBH) nanostructures with the growth of (001) BiOBr facets were prepared via a simple hydrothermal method. BiOBr possesses an average thickness of around 50 nm and shows preferential exposure of the (001) facets. α-FeO nanoparticles, with an average diameter of 5 nm, are attached on the surface of BiOBr as 20-50 nm clusters with an intimate contact interface.