Light-Induced Cation Exchange for Copper Sulfide Based CO2 Reduction

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• 作者：Aurora Manzi ; Thomas Simon ; Clemens Sonnleitner ; Markus D枚blinger ; Regina Wyrwich ; Omar Stern ; Jacek K. Stolarczyk ; Jochen Feldmann
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：November 11, 2015
• 年：2015
• 卷：137
• 期：44
• 页码：14007-14010
• 全文大小：300K
• ISSN：1520-5126

文摘

Copper(I)-based catalysts, such as Cu₂S, are considered to be very promising materials for photocatalytic CO₂ reduction. A common synthesis route for Cu₂S via cation exchange from CdS nanocrystals requires Cu(I) precursors, organic solvents, and neutral atmosphere, but these conditions are not compatible with in situ applications in photocatalysis. Here we propose a novel cation exchange reaction that takes advantage of the reducing potential of photoexcited electrons in the conduction band of CdS and proceeds with Cu(II) precursors in an aqueous environment and under aerobic conditions. We show that the synthesized Cu₂S photocatalyst can be efficiently used for the reduction of CO₂ to carbon monoxide and methane, achieving formation rates of 3.02 and 0.13 渭mol h^鈥? g^鈥?, respectively, and suppressing competing water reduction. The process opens new pathways for the preparation of new efficient photocatalysts from readily available nanostructured templates.