Understanding the Chemical Shifts of Aqueous Electrolyte Species Adsorbed in Carbon Nanopores.
Understanding the Chemical Shifts of Aqueous Electrolyte Species Adsorbed in Carbon Nanopores.
复制标题
了解碳纳米孔中吸附的水电解质物质的化学位移。
DOI:
10.1021/acs.jpclett.2c02260
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Sasikumar A
中科院分区:
文献类型:
--
作者:
Sasikumar A
Interfaces between aqueous electrolytes and nanoporous carbons are involved in a number of technological applications such as energy storage and capacitive deionization. Nuclear magnetic spectroscopy is a very useful tool to characterize ion adsorption in such systems thanks to its nuclei specificity and the ability to distinguish between ions in the bulk and in pores. We use complementary methods (density functional theory, molecular dynamics simulations, and a mesoscopic model) to investigate the relative importance of various effects on the chemical shifts of adsorbed species: ring currents, ion organization in pores of various sizes, specific ion–carbon interactions, and hydration. We show that ring currents and ion organization are predominant for the determination of chemical shifts in the case of Li+ions and hydrogen atoms of water. For the large Rb+and Cs+ions, the additional effect of the hydration shell should be considered to predict chemical shifts in agreement with experiments.
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