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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Covalently linking CuInS2 quantum dots with a Re catalyst by click reaction for photocatalytic CO2 reduction
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Covalently linking CuInS2 quantum dots with a Re catalyst by click reaction for photocatalytic CO2 reduction

机译：通过点击反应将Cuins2量子点与RE催化剂与光催化二氧化碳减少相比

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Covalently linking photosensitizers and catalysts in an inorganic-organic hybrid photocatalytic system is beneficial for efficient electron transfer between these components. However, general and straightforward methods to covalently attach molecular catalysts on the surface of inorganic semiconductors are rare. In this work, a classic rhenium bipyridine complex (Re catalyst) has been successfully covalently linked to the low toxicity CuInS2 quantum dots (QDs) by click reaction for photocatalytic CO2 reduction. Covalent bonding between the CuInS2 QDs and the Re catalyst in the QD-Re hybrid system is confirmed by UV-visible absorption spectroscopy, Fourier-transform infrared spectroscopy and energy-dispersive X-ray measurements. Time-correlated single photon counting and ultrafast time-resolved infrared spectroscopy provide evidence for rapid photo-induced electron transfer from the QDs to the Re catalyst. Upon photo-excitation of the QDs, the singly reduced Re catalyst is formed within 300 fs. Notably, the amount of reduced Re in the linked hybrid system is more than that in a sample where the QDs and the Re catalyst are simply mixed, suggesting that the covalent linkage between the CuInS2 QDs and the Re catalyst indeed facilitates electron transfer from the QDs to the Re catalyst. Such an ultrafast electron transfer in the covalently linked CuInS2 QD-Re hybrid system leads to enhanced photocatalytic activity for CO2 reduction, as compared to the conventional mixture of the QDs and the Re catalyst.
机译：在无机 - 有机杂交光催化系统中共价连接光敏剂和催化剂是有利于这些组分之间有效的电子转移。然而，在无机半导体表面上共价附着分子催化剂的一般和直接方法是罕见的。在这项工作中，通过点击反应进行光催化二氧化碳还原，经典铼硼吡啶复合物（RE催化剂）成功与低毒性Cuins2量子点（QDS）共价连接。通过UV可见的吸收光谱，傅立叶变换红外光谱和能量分散X射线测量来确认CuinS2 QD和RE催化剂之间的共价键合。时间相关的单光子计数和超快时间分辨红外光谱提供了从QD到RE催化剂的快速光学感应电子转移的证据。在QDS的光激发时，单个还原的RE催化剂形成在300 fs内。值得注意的是，链接混合系统中的重量减少的量大于QD和再催化剂的样品中的QDS和再催化剂的样品中，表明CUINS2 QD和RE催化剂之间的共价连锁确实有利于来自QD的电子转移到RE催化剂。与QD和RE催化剂的常规混合物相比，共价连接的Cuins2 QD-RE混合系统中的这种超快电子传递导致CO 2还原的光催化活性。

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