Photocatalytic production of H2O2 over facet-dependent Ti-MOF

Abstract

In the past several years, two-phase photocatalysts, such as PDI/C₃N₄, ZIF/C₃N₄ or Cu₂(OH)PO₄/C₃N₄, have been used for H₂O₂ photo-production. Few monocomponent photocatalysts for H₂O₂ production were reported. Among the monocomponent photocatalysts, Ti-MOF photocatalysts for H₂O₂ photo-production have attracted much attention, although it is a challenge for Ti-MOFs to achieve good electron–hole separation. Herein, monocomponent structure NH₂-MIL-125 with coexisting (111) and (001) facets was prepared as a photocatalyst for H₂O₂ production. A “two-channel” route in the photocatalyst is formed in the frustum structure NH₂-MIL-125. One channel is O₂ reduction by conduction band electrons on (111) facets, and the other is the valence band holes on (001) facets. This work will benefit the design of monocomponent Ti-MOF photocatalysts.