Study on photocatalytic hydrogen evolution over Eosin Y sensitized CQDs-Ni12P5
Stable carbon quantum dots(CQDs)and Ni12P5 were synthesized by hydrothermal method and low temperature calcination method,respectively.The two materials were then combined into CQDS-Ni12 P5 by simple mechanical grinding.The as-obtained catalysts were characterized by X-ray diffractometer(XRD),transmission electron microscope(TEM)and electro-chemical impedance spectra(EIS),and the electron transfer behavior was measured by fluorescence(FL).Using dye Eosin Y(EY)as the catalyst(sensitizer),Ni12P5 as the cocatalyst and trimethylamine(TMA)as the sacrificial agent,the dye-sensitized hydrogen production performance of Ni12P5 modified by CQDs was studied.The results showed that Ni12P5 loaded with 15 wt％CQDs(15CQDs-Ni12P5)exhibited the highest dye-sensitized hydrogen evolution activity(3 565 μmol·h-1·g-1),which was 3.36 times higher than that of pure Ni12P5.The increased activity was due to the efficient electron transfer among EY,CQDs and Ni12P5.In addition,the possible mechanism of hydrogen evolution reaction was discussed.
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