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Electrocatalytic conversion of CO2 to produce solar fuels in electrolyte or electrolyte-less configurations of PEC cells

机译:CO2的电催化转化,以PEC电池的电解质或无电解质配置生产太阳能燃料

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摘要

The electrocatalytic reduction of CO2 is studied on a series of electrodes (based on Cu, Co, Fe and Pt metal nanoparticles deposited on carbon nanotubes or carbon black and then placed at the interface between a Nafion membrane and a gas-diffusion-layer electrode) on two types of cells: one operating in the presence of a liquid bulk electrolyte and the other in the absence of the electrolyte (electrolyte-less conditions). The results evidence how the latter conditions allow productivity of about one order of magnitude higher and how to change the type of products formed. Under electrolyte-less conditions, the formation of > C2 products such as acetone and isopropanol is observed, but not in liquid-phase cell operations on the same electrodes. The relative order of productivity in CO2 electrocatalytic reduction in the series of electrodes investigated is also different between the two types of cells. The implications of these results in terms of possible differences in the reaction mechanism are commented on, as well as in terms of the design of photoelectrocatalytic (PEC) solar cells.
机译:在一系列电极(基于沉积在碳纳米管或炭黑上,然后置于Nafion膜和气体扩散层电极之间的界面上的Cu,Co,Fe和Pt金属纳米粒子的基础上,研究了CO2的电催化还原)可以在两种类型的电池上使用:一种在存在液体本体电解质的情况下运行,另一种在不存在电解质的情况下运行(无电解质条件)。结果证明了后一种条件如何使生产率提高约一个数量级,以及如何改变所形成产品的类型。在无电解质条件下,观察到了> C2产物(例如丙酮和异丙醇)的形成,但在同一电极上的液相电池操作中却没有观察到。在两种类型的电池之间,在所研究的一系列电极中,CO2电催化还原的生产率的相对顺序也有所不同。评论了这些结果在反应机理上可能存在的差异以及在光电催化(PEC)太阳能电池方面的意义。

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