Cl-/Cl3-Redox Voltammetry to Recognize the Interfacial Layer on Positively Electrified Carbon in water-in-Salt Electrolytes
- Authors
- Son, Sungjun; Yeo, Jeongmin; Chang, Jinho
- Issue Date
- Sep-2022
- Publisher
- American Chemical Society
- Citation
- Analytical Chemistry, v.94, no.37, pp.12691 - 12698
- Indexed
- SCIE
SCOPUS
- Journal Title
- Analytical Chemistry
- Volume
- 94
- Number
- 37
- Start Page
- 12691
- End Page
- 12698
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/185355
- DOI
- 10.1021/acs.analchem.2c02029
- ISSN
- 0003-2700
- Abstract
- A Water-in-Saltelectrolyte solution (WiSE) is a promising aqueous medium for lithium-ion batteries containing highly concentrated electrolytes. For the increased kinetic overpotential of water oxidation in WiSE, the formation of an interfacial layer (IFL) on a positively electrified electrode is crucial. Nonetheless, most related studies have been restricted to theoretical approaches. In this Article, we voltammetrically study the Cl-/Cl3-/Cl2 redox reaction on Pt and glassy carbon (GC) electrodes in WiSE containing LiTFSI (WiSELiTFSI) and demonstrate that careful monitoring of Cl-/Cl3- redox voltammetry can allow recognition of an IFL formed on a positively electrified electrode. The voltammetric wave attributed to the electro-oxidation of Cl- on a GC electrode was negatively more shifted as the molal concentration of LiTFSI was increased from 0.5 to 6 m, while there was no shift on Pt. Also, there was voltammetric resolution into two peaks associated with Cl-/Cl3- and Cl3-/Cl2 on the GC electrode in WiSELiTFSI, while only unresolved, one redox-paired voltammograms were observed on Pt, regardless of the molal concentration of LiTFSI. These two main voltammetric features indicate the LiTFSI-induced IFL coupled with Cl- and Cl3- on a GC electrode induced by an applied potential of 2 V versus the point of zero charge (PZC). We found other halide/halogen redox reactions did not show differentiated voltammetric behaviors in WiSELiTFSI, which demonstrates the uniqueness of the Cl-/Cl3- redox reaction for recognizing the IFL formed on a positively charged electrode surface. Lastly, a strong interaction between the IFL and Cl species was also confirmed by XPS measurements.
- Files in This Item
-
Go to Link
- Appears in
Collections - 서울 자연과학대학 > 서울 화학과 > 1. Journal Articles
![qrcode](https://api.qrserver.com/v1/create-qr-code/?size=55x55&data=https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/185355)
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.