A Dual‐Channel Charge Transfer Heterostructure toward Boosting Photocatalytic Hydrogen Evolution

Abstract The design and fabrication of dual‐channel charge transmission mode are crucial to developing highly effective photocatalysts. However, constructing double charge transfer paths by loading dual cocatalysts in a nanocomposite is still a great challenge. Here, hollow Co 9 S 8 nanocages are utilized to design a hierarchical Co 9 S 8 /CdIn 2 S 4 /Pt heterostructure with dual‐channel for charge transfer, in which Co 9 S 8 nanocages and Pt particles act as cocatalysts. Moreover, Co 9 S 8 and CdIn 2 S 4 form an atomic interfacial contact by intermediate sulfur atoms. Due to double‐channel charge transfer and atomic interfacial bonding, the Co 9 S 8 /CdIn 2 S 4 /Pt nanocages accelerate the photo‐induced carriers transfer and suppress the combination of electron–hole pairs. As a result, the Co 9 S 8 /CdIn 2 S 4 /Pt nanocages exhibit increased photocurrent density of 62.8 µA cm −2 , far exceeding that of pristine Co 9 S 8 (6.87 µA cm −2 ). The optimized Co 9 S 8 /CdIn 2 S 4 /Pt nanocages display excellent photocatalytic H 2 in production rate of 13 426 µmol g −1 h −1 and high cyclic stability for water splitting.