Efficient, Full Spectrum-Driven H 2 Evolution Z-Scheme Co 2 P/CdS Photocatalysts with Co–S Bonds

作者：Nan Li, Yunxuan Ding, Jiaojiao Wu, Zhijie Zhao, Xitao Li, Yan‐Zhen Zheng, Meilan Huang, Xia Tao · 发表于：ACS Applied Materials & Interfaces · 年份：2019 · DOI：10.1021/acsami.9b03965 · 被引用次数：108 · 研究领域：Advanced Photocatalysis Techniques、Quantum Dots Synthesis And Properties、Copper-based nanomaterials and applications

Exploring high-efficiency, low-cost, and stable photocatalysts that enable full solar spectrum including UV, visible, and near-infrared (NIR) light utilization for photocatalytic hydrogen generation still faces huge challenge. Herein, a Co 2 P/CdS Z-scheme photocatalyst without a noble metal is rationally fabricated to achieve ultrabroad UV–vis–NIR harvesting. Compared to Pt/CdS, CdS, and Co 2 P, the optimized Co 2 P/CdS exhibits much more outstanding performance with the H 2 generation rates of 262.16, 66.98, and 3.93 mmol/g/h under solar, visible (780 nm > λ > 420 nm), and NIR (λ > 780 nm) light, respectively. Particularly, 10% Co 2 P/CdS displays a prominent apparent quantum efficiency value of 2.26% at 700 nm. The Z-scheme transform route can effectively enhance the separation of charge carriers in Co 2 P/CdS for UV–vis-driven HER, as confirmed by photoluminescence and photoelectrochemical measurements. More importantly, the Co–S bonds at the interface demonstrated by Fourier transform infrared, Raman (mapping), and X-ray photoelectron spectroscopy and density functional theory calculations can act as a “bridge” for charge transfer, thereby enhancing the full spectrum-driven H 2 evolution. To the best of our knowledge, this is a rare research on full spectrum-driven photocatalytic HER without a noble metal.