Zhiwei Chen,Yuyu Bu,Lin Wang,Xiao Wang,Jin-Ping Ao
In this paper, we prepare porous g-C 3 N 4 by hydrothermal process, and then Rh atoms are anchored on the carbon nitride framework. After further phosphating, a novel single-sites-like Rh-phosphide (Rh-P) modified carbon nitride photocatalyst is fabricated. The photocatalytic hydrogen evolution rate of Rh-P modified carbon nitride is 33 times higher than that of pure C 3 N 4 . Structure analysis results show that Rh-P dots are dispersed with single-sites state on the surface of carbon nitride framework. Further theoretical calculation and the photoelectrochemical results reveal that Rh-P single-sites on carbon nitride provide photogenerated convergence centers to decrease the hydrogen evolution potential and enhance the free charge transfer capability. Thus, it improves the photocatalysis hydrogen evolution performance of the carbon nitride.
Caili Xu,Qi Wang,Rong Ding,Yi Wang,Yun Zhang,Guangyin Fan
Metal phosphides (MPs) synthesized by solid-state reaction have shown considerable potential in hydrogen evolution reaction (HER) from water splitting compared with that of Pt. However, large-sized MP nanoparticles (NPs) with irregular morphologies are inevitably achieved via the solid-state reaction with high-temperature calcination, which lead to the reduced availability of the active sites. Here, a simple and straightforward strategy was developed to synthesize monodispersed, uniformly distributed, and small Rh x P NPs decorated on phosphorus-doped nitride carbon (PNC) via the pyrolysis of rhodium(Ш) chloride, triphenylphosphine , and melamine (Rh x P/PNC-m). The Rh x P/PNC-m that served as a HER electrocatalyst displayed excellent performance with the overpotentials of 24 and 27 mV at 10 mA cm −2 in basic and acidic solutions, respectively. This catalyst also showed good long-term stability in both media. The high-performance of Rh x P/PNC-m should be attributed to the small, monodispersed, and highly distributed Rh x P NPs on PNC support, which can supply abundant catalytically active sites for HER. The developed strategy for the synthesis of small Rh x P NPs may offer new opportunities toward the electrochemical applications of other metal phosphides.
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