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A binary noble-metal-free cocatalyst consisting of ZnIn 2 S 4 and In(OH) 3 was developed via a facile one-step hydrothermal method. The ZnIn 2 S 4 /In(OH) 3 modified ZnWO 4 nanocomposite exhibited enhanced photocatalytic H 2 evolution activity compared to all the related pure samples and binary composite photocatalysts under visible light irradiation. The enhanced photocatalytic hydrogen production activities can be attributed to the synergistic effects of the favorable light trapping ability and efficient spatial charge separation. The photocatalytic hydrogen evolution activity over other semiconductors, such as Zn 2 SnO 4 and TiO 2 , can also be significantly increased by loading ZnIn 2 S 4 /In(OH) 3 as a cocatalyst. The results clearly demonstrated that ZnIn 2 S 4 /In(OH) 3 is discovered as a new class of earth-abundant cocatalyst for water-splitting under visible light irradiation. It is expected that our work could provide a new strategy to improve the visible light response of semiconductors and facilitate their application in water splitting., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)