Journal
APPLIED CATALYSIS A-GENERAL
Volume 666, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcata.2023.119421
Keywords
Graphdiyne; CuI; Electron-rich layer; Photocatalytic hydrogen evolution; Z-scheme heterojunction
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A CuI-graphdiyne/Ni-MOF ternary system was successfully constructed with a proposed photocatalytic mechanism involving a Z-scheme heterojunction. Graphdiyne, as an electron-rich layer, enhanced the photocatalytic performance of CuI and facilitated electron transport between CuI and Ni-MOF.
A CuI-graphdiyne/Ni-MOF ternary system was successfully constructed. Intially, CuI-graphdiyne was obtained by growth of GDY on the surface of CuI. Subequently, the CuI-graphdiyne was immobilized onto the surface of NiMOF using a simple physical stirring method. This, immobilization approach effectively reducing the accumulation of CuI-graphdiyne and increased the number of active sites for hydrogen evolution. Furthermore, a combination of various characterization techniques and energy band structures analysis was employed to propose the photocatalytic reaction mechanism between CuI and Ni-MOF. The proposed mechanism involves a Zscheme heterojunction and suggests that the combination of CuI and Ni-MOF enhances the overall redox ability of the composite catalyst. By comparing CuI/Ni-MOF with CuI-graphdiyne/Ni-MOF, it was observed that the presence of graphdiyne as an electron-rich layer on CuI enhances the photocatalytic performance of CuI. Additionally, it facilitates electron transport between CuI and Ni-MOF, thereby improving the efficiency of photogenerated electron-hole complex separation. This experimental study provides valuable insight into the utilization of graphdiyne for enhancing transport in heterojunction.
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