Efficient, Full Spectrum-Driven H2 Evolution Z-Scheme Co2P/CdS Photocatalysts with Co–S Bonds

• DOI: 10.1021/acsami.9b03965
• Publication Date: 2019-06-04T16:45:39Z
• Authors: Nan Li; Yunxuan Ding; Jiaojiao Wu; Zhijie Zhao; Xitao Li; Yan-Zhen Zheng; Meilan Huang; Xia Tao
• Keywords: Visible spectrum; Noble metal

Exploring high-efficiency, low-cost, and stable photocatalysts that enable full solar spectrum including UV, visible, near-infrared (NIR) light utilization for photocatalytic hydrogen generation still faces huge challenge. Herein, a Co2P/CdS Z-scheme photocatalyst without noble metal is rationally fabricated to achieve ultrabroad UV-vis-NIR harvesting. Compared Pt/CdS, CdS, Co2P, the optimized exhibits much more outstanding performance with H2 rates of 262.16, 66.98, 3.93 mmol/g/h under solar, visible (780 nm > λ 420 nm), NIR (λ 780 nm) light, respectively. Particularly, 10% displays prominent apparent quantum efficiency value 2.26% at 700 nm. The transform route can effectively enhance separation charge carriers in UV-vis-driven HER, as confirmed by photoluminescence photoelectrochemical measurements. More importantly, Co-S bonds interface demonstrated Fourier infrared, Raman (mapping), X-ray photoelectron spectroscopy density functional theory calculations act "bridge" transfer, thereby enhancing spectrum-driven evolution. To best our knowledge, this rare research on HER metal.