首页|Graphdiyne(CnH2n-2)as an"electron transfer bridge"boosting photocatalytic hydrogen evolution over Zn0.5Co0.5S/MoS2 S-scheme heterojunction
Graphdiyne(CnH2n-2)as an"electron transfer bridge"boosting photocatalytic hydrogen evolution over Zn0.5Co0.5S/MoS2 S-scheme heterojunction
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In the process of photocatalytic water cracking,the migration rate and utilization rate of photogenerated charges determine the hydrogen evolution performance of the catalyst.In this paper,a carbon isotope superconduct-ing material graphdiyne(GDY)is prepared by mechanical ball milling and introduced into the S-scheme heterojunc-tion Zn0.5Co0.5S/MoS2 inorganic system.In terms of hydrogen evolution kinetics,GDY acts as an electron bridge,not only accelerating the migration of photogen-erated carriers but also improving the utilization of pho-togenerated charges.Morphologically,the large two-dimensional layer provides more loading and anchoring points for Zn0.5Co0.5S/MoS2,which increases the number of active sites.The ternary composite catalyst 20％GDY/Zn0.5Co0.5S/Mo2S(20-GCSM)generates 69.94 μmol of hydrogen(5 h)in triethanolamine solution.It is 2.97 and 1.80 times higher than Zn0.5Co0.5S and Zn0.5Co0.5S/MoS2,respectively.After the cyclic experiment,it still has stable hydrogen evolution performance after standing for 24 h(under dark conditions).In addition,the potential mechanism of photocatalytic hydrogen evolution is demonstrated through in-situ X-ray photoelectron spectroscopy.This work provides a reference for further research in the field of introducing carbon materials into photocatalytic systems and improving the utilization of photogenerated charges.
GraphdiyneS-scheme heterojunctionElectron transfer bridgeHydrogen production
Mei Li、Jing-Zhi Wang、Zhi-Liang Jin
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School of Chemistry and Chemical Engineering,North Minzu University,Yinchuan 750021,China
School of Chemistry and Chemical Engineering,Ningxia Key Laboratory of Solar Chemical Conversion Technology,Key Laboratory for Chemical Engineering and Technology,State Ethnic Affairs Commission,North Minzu University,Yinchuan 750021,China
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