Abstract
Photocatalysis is considered to be the most promising route for remediation of the environment by degradation of pollutants and production of environment friendly fuels. There are two major factors that affect the efficiency of photocatalysts that are (i) poor light absorption in visible regions and (ii) photoexcited charge separation and transportation in heterojunctions. These problems are solved by formation of heterojunctions between two or more semiconductors which enhance their photocatalytic activities. Effective charge transfer at the heterojunction is a key factor required to explore further as the already developed schemes have the major technicalities to address for the enhanced photoexcited charge production and separation via effective interface, without losing effective electrons required for boosting the rates of various reactions at the surface sites of the photocatalysts. This review gives an overview of photocatalytic activities, and construction of various types of heterojunctions between metal oxide-metal oxide, metal oxide-metal sulfide and metal sulfide-metal sulfide-based heterostructures. The band gap adjustments and alignments in various types of emerging heterojunctions are explored and correlated to establish structure-photoactivity relationship and photostability of metal oxides and metal sulfides with established binary, ternary and quaternary composites. This study has paved the potential ways to design efficient heterojunction-based strategies for photocatalytic applications.
Published Version
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