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

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 Co9S8 nanocages are utilized to design a hierarchical Co9S8/CdIn2S4/Pt heterostructure with dual‐channel for charge transfer, in which Co9S8 nanocages and Pt particles act as cocatalysts. Moreover, Co9S8 and CdIn2S4 form an atomic interfacial contact by intermediate sulfur atoms. Due to double‐channel charge transfer and atomic interfacial bonding, the Co9S8/CdIn2S4/Pt nanocages accelerate the photo‐induced carriers transfer and suppress the combination of electron–hole pairs. As a result, the Co9S8/CdIn2S4/Pt nanocages exhibit increased photocurrent density of 62.8 µA cm−2, far exceeding that of pristine Co9S8 (6.87 µA cm−2). The optimized Co9S8/CdIn2S4/Pt nanocages display excellent photocatalytic H2 in production rate of 13 426 µmol g−1 h−1 and high cyclic stability for water splitting. A Co9S8/CdIn2S4/Pt heterostructure with an atomic interfacial contact and dual‐channel for charge transfer is designed and fabricated. The dual‐Z‐scheme system can extremely accelerate the photo‐induced carriers transfer and enhances the photocatalytic activity. The Co9S8/CdIn2S4/Pt heterostructure shows extraordinary photocatalytic activity of around 13 426 µmol g−1 h−1 under visible light illumination and outstanding cycling stability.