Interaction of electrolyte molecules with the surface  of porous carbon: NMR study

I.M. Budzuliak; L.S. Yablon; V.O. Kotsyubynsky; B.I. Rachii; I.I. Budzuliak; V.M. Boychuk; R.V. Ilnytskyi; R.I. Kryvulych

doi:10.15330/pcss.25.1.212-216

Authors

I.M. Budzuliak Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
L.S. Yablon Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
V.O. Kotsyubynsky Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
B.I. Rachii Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
I.I. Budzuliak Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
V.M. Boychuk Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
R.V. Ilnytskyi Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
R.I. Kryvulych Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine

DOI:

https://doi.org/10.15330/pcss.25.1.212-216

Keywords:

porous carbon, NMR, chemical shift, electrolyte

Abstract

Electrochemical double-layer capacitors use porous carbons as the electrode material, and improving their performance requires an understanding of the electrolyte−carbon surface interactions. ¹³C, ¹⁴N, and ¹¹B NMR spectroscopy were used to investigate the behaviour of the electrolytes [C(OCH3)₃NH₃]⁺Cl^- and [N(CH₂CH₃)]⁺BF_4- on the surface of porous carbon in D₂O solutions. A chemical shift of ¹³C has been found in the fragments N–C, indicating electron density redistribution between nitrogen atoms and alkyl fragments. The presence of a signal with a chemical shift of d = 7.7 confirms the structuring of the electrolytic layer of water solution [N(CH₂CH₃)]⁺BF₄^-.

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