Robust photocatalytic hydrogen evolution over amorphous ruthenium phosphide quantum dots modified g-C3N4 nanosheet.

Graphical abstract Ruthenium phosphide/C 3 N 4 composites were prepared via a in-situ growth method for the first time. The as-obtained photocatalysts show efficient activity hydrogen evolution under visible ligth irradiation. The optimum H 2 evolution rate reached up to 2110 μmol h−1 g−1 for 0.1%-RP/g-CN, which was 113.4 times as high as that of pristine g-C 3 N 4 and 2.22 times of Pt-loaded g-C 3 N 4. Highlights • Ruthenium phosphide/C 3 N 4 composites were prepared via a in-situ growth method for the first time. • The composites exhibited greatly enhanced photocatalytic hydrogen evolution rate. • Well dispersion and intimate interface between ruthenium phosphide and C 3 N 4 nanosheets contributed to the high activity. Abstract The development of materials which meet the needs of both cost-efficiency and high performance for hydrogen evolution reaction is of great importance. However, developing photocatalysts with Pt-like activity still remains as a major challenge. Herein, we utilize ultrafine amorphous ruthenium phosphide (RP) nanoparticles as a high-efficient and robust cocatalyst to enhance the H 2 production activity of g-C 3 N 4 (g-CN). The RP/g-CN samples were prepared based on a facile in-situ growth phosphatization method. The optimum H 2 evolution rate reached up to 2110 μmol h−1g−1 for 0.1%-RP/g-CN, which was 113.4 times as high as that of pristine g-C 3 N 4 and 2.22 times of Pt-loaded g-C 3 N 4. Furthermore, ruthenium is the cheapest platinum-group metal and its amount in the best RP/g-CN sample is only 0.1%, showing the superiority of competitive price and high activity. The introduction of ultrafine amorphous ruthenium phosphide accelerated the transfer rate of electrons and restrain the recombination of charge carriers. The amorphous ruthenium phosphide ultrafine nanoparticles could also serve as cocatalysts for hydrogen evolution. This work provides a promising alternative to expensive Pt-loaded photocatalyst for excellent hydrogen evolution performance under visible light irradiation. [ABSTRACT FROM AUTHOR]