Inorganic semiconductors-graphene composites in photo(electro)catalysis: Synthetic strategies, interaction mechanisms and applications

•Photocatalytic activity of GR-SC composites depends on interface properties.•Synthesis and characterization methods are pivotal to studying properties of GR-SC composite.•Tuning of interface properties is critical to synthesizing optimal composite.•Properties of resulting composites have significant effect on photocatalytic activity.