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首页> 外文期刊>Physical chemistry chemical physics: PCCP >The role of hydrogen bond donor and water content on the electrochemical reduction of Ni(2+)from solvents - an experimental and modelling study
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The role of hydrogen bond donor and water content on the electrochemical reduction of Ni(2+)from solvents - an experimental and modelling study

机译：氢键供体和水含量对溶剂的Ni（2+）电化学减少的作用 - 实验和建模研究

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摘要

Deep Eutectic Solvents (DESs) are hygroscopic liquids composed of a hydrogen bond donor (HBD) and acceptor (HBA). Their physical, chemical and electrochemical properties can be tailored to use them as solvents for different applications,i.e.electrodeposition, catalysis, extraction,etc.This can be done by changing the HBD, as well by adding water. However, the interrelated influence of H2O and HBD on the structure of the electrolyte, and on the behavior of the active species is not fully understood. In this work, we select nickel electrodeposition as a case study and we combine electrochemical techniques (cyclic voltammetry, chronoamperometry) with UV-vis spectroscopy and molecular dynamics to understand the influence of water and HBD on the electrochemical behaviour of DESs. The unique combination of these different experimental and modelling techniques provides new insights into the field. The addition of H2O changes, not only the interactions between the constituents of the liquid, but also the coordination of metal cations, which is reflected in the electrochemical performance of different DESs. More importantly, we show that, in the presence of very little (between 0.1 wt% and 2.8 wt%) and high (>4.5 wt%) water contents, DESs behave differently, and the changes in their electrochemical behavior are caused by both the complexation of metal cations and the electrolyte transport properties.
机译：深度共晶溶剂（DESS）是由氢键供体（HBD）和受体（HBA）组成的吸湿液体。它们的物理，化学和电化学性能可以定制以使用它们作为不同应用的溶剂，即电池，催化，提取等。可以通过加入水来改变HBD来完成。然而，H 2 O和HBD在电解质结构上的相互关联影响，并且不完全理解活性物质的行为。在这项工作中，我们选择镍电沉积作为案例研究，我们将电化学技术（循环伏安法，计时法）与UV-Vis光谱和分子动力学结合，以了解水和HBD对Dess电化学行为的影响。这些不同实验和建模技术的独特组合为该领域提供了新的见解。添加H2O的变化，不仅是液体成分之间的相互作用，而且是金属阳离子的协调，其反映在不同DES的电化学性能中。更重要的是，我们表明，在很少（0.1wt％和2.8wt％之间）和高（> 4.5wt％）水内容物中，Dess表现不同，并且其电化学行为的变化是由金属阳离子的络合和电解质传输性能。

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