Construction of 2D/2D BiOIO 3 /Bi 2 O 2 CO 3 composite structures with face-to-face contacts can facilitate carrier transfer via a built-in electric field and a polar field for pyro–photo-electric catalysis

A BiOIO 3 /Bi 2 O 2 CO 3 catalyst was prepared by a one-step hydrothermal method. The catalyst exhibited high performance due to the built-in and polarized electric fields which significantly reduced the recombination of carriers.