Exploring high efficiency, low cost and stable photocatalysts that enable full solar spectrum (UV, visible and near-infrared) 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 to Pt/CdS, CdS and Co2P, the optimized Co2P/CdS exhibits much more outstanding performance with the HER rate 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% Co2P/CdS displays a prominent AQE value of 2.26% at 700 nm. The Z-scheme transform route can effectively enhance the separation of charge carriers in Co2P/CdS for UV-Vis-driven H2 evolution reaction (HER), as confirmed by PL and photoelectrochemical measurements. More importantly, the Co-S bonds at the interface demonstrated by FTIR, Raman (mapping), XPS and density functional theory (DFT) calculations can act as “bridge” for charge transfer, thereby enhancing the full spectrum-driven H2 evolution. To our best knowledge, this is a rare research on full spectrum-driven photocatalytic HER without noble metal.
Bibliographical noteThis is in interdisciplinary research in collaboration with Chemical Engineers from Beijing University of Chemical Technology.
It was conducted by my PhD student and a visiting PhD student in my group.
It was published in ACS Applied Materials and Interfaces, which has an impact factor of 9.2 and CiteScore of 14.4