3D/2D ZnIn2S4/BiFeO3 as S‐scheme heterojunction photocatalyst for boosted visible‐light hydrogen evolution

Abstract

AbstractPhotocatalytic H2 evolution technique has been proved to be one of the promising approaches to overcome the present energy and environmental issues caused by the combustion of fossil fuel. Constructing heterojunction can realize the efficient separation and migration of charges and thus achieve enhanced H2 evolution performance. Herein, we designed and prepared a ZnIn2S4/BiFeO3 heterojunction photocatalyst with a 3D/2D structure via an ultrasonic self‐assembly process. The typical 3D/2D structure with intimate interface was obtained, which not only provided more active sites but also boosted the migration of photogenerated charges. The optimal mass ratio of BiFeO3 in ZnIn2S4/BiFeO3 was determined to be 10%, and a 10.5‐fold increase in H2 evolution rate in comparison with of pure ZnIn2S4 was achieved. Furthermore, the ZnIn2S4/BiFeO3 composite exhibited excellent recyclability and structural stability based on cycling experiment. A S‐scheme heterojunction mechanism was revealed according to the experimental results of photocatalytic H2 evolution and electrochemical tests.