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Determination of hydration numbers of ionic species using dielectric relaxation spectroscopy: its implication in thermocells and aqueous LIBs

Title
Determination of hydration numbers of ionic species using dielectric relaxation spectroscopy: its implication in thermocells and aqueous LIBs
Authors
Kim, KyungguHwang, SunwookLee, Hochun
DGIST Authors
Lee, Hochun
Issue Date
2020-07-07
Citation
제125회 대한화학회 학술발표회
Type
Conference
Abstract
Determining the hydration numbers of ionic species (metal ions, metal-ligand complexes, and anions) in aqueous solutions is not trivial. To our surprise, the hydration numbers of Fe2+/3+ and ferri/ferrocyanides (Fe(CN)63-/4-) are unknown yet, despite their wide usage in various electrochemical application. This talk will introduce dielectric relaxation spectroscopy (DRS) as a versatile tool to investigate the solution structure of aqueous solutions. DRS is a powerful method for studying the reorientation dynamics of permanent dipoles of solvents and ion pairs. In brief, DRS provides the concentration of free water (CFW), from which the number of the irrotationally-bound water molecules (Zib) is derived as below [1]:Zib = (CTW − CFW)/Csalt where CTW is the analytical concentration of water (55.5 M), and Csalt is the salt concentration. While Zib is not necessarily identical with the coordination number of the ion, it can be regarded as the effective hydration number [1]. The application of DRS in thermogalvanic cells and aqueous LIB electrolytes will be presented as the case studies.
URI
http://hdl.handle.net/20.500.11750/14039
Publisher
대한화학회
Related Researcher
  • Author Lee, Hochun Electrochemistry Laboratory for Sustainable Energy(ELSE)
  • Research Interests Lithium-ion batteries; Novel Materials for rechargeable batteries; Novel energy conversion;storage systems; Electrochemistry; 리튬이차전지; 이차전지용 신규 전극 및 전해액; 신규 에너지변환 및 저장 시스템; 전기화학
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Collection:
Department of Energy Science and EngineeringElectrochemistry Laboratory for Sustainable Energy(ELSE)2. Conference Papers


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