Z‐scheme photocatalytic production of hydrogen peroxide over Bi4O5Br2/g-C3N4 heterostructure under visible light

Photocatalytic production of hydrogen peroxide from water and oxygen is a promising technique due to the green and sustainable solar-to-chemical energy conversion. However, in the absence of organic sacrificial agents as electron donors, the relatively low photocatalytic H 2 O 2 productivity is still far from satisfactory. Herein, we present a Z‐scheme photocatalytic production of hydrogen peroxide over Bi 4 O 5 Br 2 /g-C 3 N 4 heterostructure under visible light without additive organics. The obtained Bi 4 O 5 Br 2 /g-C 3 N 4 heterostructure exhibited a highest H 2 O 2 production of 124 μM in 60 min by a Z-scheme photocatalytic mechanism. The photoinduced electrons of Bi 4 O 5 Br 2 combine with the holes of g-C 3 N 4 at the contact interface, and the e − and h + of the heterostructure are mainly derived from the conduction band of g-C 3 N 4 and valence band of Bi 4 O 5 Br 2 , respectively. As such, more e − and h + of Bi 4 O 5 Br 2 /g-C 3 N 4 heterostructure are available to reduce oxygen and oxidize water, respectively, with more ·O 2 − and ·OH generated and thus more H 2 O 2 produced.