Light-Induced Cation Exchange for Copper Sulfide Based CO2 Reduction
Light-Induced Cation Exchange for Copper Sulfide Based CO2 Reduction
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DOI：
10.1021/jacs.5b06778
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发表时间：
2015-11-11
影响因子：
15
通讯作者：
Feldmann, Jochen
中科院分区：
文献类型：
--
作者：
Manzi, Aurora;Simon, Thomas;Feldmann, Jochen
铜（I）基催化剂，例如Cu 2S，被认为是用于光催化CO 2还原的非常有前途的材料。一个常见的合成路线Cu 2S通过阳离子交换从CdS纳米晶体需要Cu（I）的前体，有机溶剂，和中性气氛，但这些条件是不兼容的原位应用程序中的CdS。在这里，我们提出了一种新的阳离子交换反应，利用CdS的导带中的光激发电子的还原电位，并与Cu（II）前体在水性环境中，在有氧条件下进行。我们表明，合成的Cu 2S光催化剂可以有效地用于还原CO2一氧化碳和甲烷，实现3.02和0.13 μ mol h（-1）的形成率。g（-1），并抑制竞争性水减少。该过程为从现成的纳米结构模板制备新的高效光催化剂开辟了新的途径。
Copper(I)-based catalysts, such as Cu2S, are considered to be very promising materials for photocatalytic CO, 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 mu mol h(-1). g(-1), respectively, and suppressing competing water reduction. The process opens new pathways for the preparation of new efficient photocatalysts from readily available nanostructured templates.