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首页> 外文期刊>RSC Advances >Tuning nanocavities of Au@Cu2O yolk–shell nanoparticles for highly selective electroreduction of CO2 to ethanol at low potential
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Tuning nanocavities of Au@Cu2O yolk–shell nanoparticles for highly selective electroreduction of CO2 to ethanol at low potential

机译：调谐Au @ Cu2O蛋黄壳纳米粒子的纳米螺母，用于在低电位下将CO 2与乙醇的高度选择性电荷电极

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The electrosynthesis of high-value ethanol from carbon dioxide and carbon monoxide addresses the need for the large-scale storage of renewable electricity and reduction of carbon emissions. However, the electrosynthesis of ethanol by the CO _(2) reduction reaction (CO _(2) RR) has suffered from low selectivity and energy efficiency. Here, we report a catalyst composed of Au nanoparticles in Cu _(2) O nanocavities (Au@Cu _(2) O) that is very active for CO _(2) reduction to ethanol through the confinement of the CO intermediate. The architecture shows tandem catalysis mechanisms in which CO _(2) reduction on Au yolks produces CO filling Cu nanocavities, where a sufficiently high CO concentration due to the confinement effect promotes ethanol formation and then results in an ethanol faradaic efficiency of 52.3% at ?0.30 V versus the reversible hydrogen electrode ( vs. RHE) via regulating the hollow size of the Cu _(2) O nanocavities. Such a strategy provides a new way of fabricating various tandem catalysts with high selectivity and efficiency for the CO _(2) RR.
机译：二氧化碳和一氧化碳的高价值乙醇的电合作方法解决了对可再生电力的大规模储存和减少碳排放的需求。然而，通过CO _（2）还原反应（CO _（2）RR）的乙醇电连接已遭受低选择性和能量效率。在此，我们在Cu _（2）o纳米腔中的Au纳米粒子（Au @ Cu _（2）O）中的Au纳米粒子组成的催化剂通过CO中间体的限制将Co _（2）的Co _（2）还原为乙醇。该结构显示串联催化机制，其中Au蛋黄的CO _（2）还原产生CO填充Cu纳米蜂节，其中由于限制效果引起的足够高的Co浓度促进了乙醇形成，然后导致乙醇率为52.3％的乙醇效率为52.3％通过调节Cu _（2）O纳米盖的中空尺寸为0.30V与可逆氢电极（Vs.RHE）。这种策略提供了制造具有高选择性和效率的各种串联催化剂的新方法，用于CO _（2）RR。

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