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http://dx.doi.org/10.7316/KHNES.2016.27.2.176

Study on the Electrochemical Characteristics of a EGaIn Liquid Metal Electrode for Supercapacitor Applications  

SO, JU-HEE (Research Institute of Industrial Technology Convergence, Korea Institute of Industrial Technology)
KOO, HYUNG-JUN (Dept. of Chemical & Biomolecular Engineering, Seoul National University of Science and Technology)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.27, no.2, 2016 , pp. 176-181 More about this Journal
Abstract
Recent years, supercapacitors have been attracting a growing attention as an efficient energy storage, due to their long-lifetime, device reliability, simple device structure and operation mechanism and, most importantly, high power density. Along with the increasing interest in flexible/stretchable electronics, the supercapacitors with compatible mechanical properties have been also required. A eutectic gallium-indium (EGaIn) liquid metal could be a strong candidate as a soft electrode material of the supercapacitors because of its insulating surface oxide layer for electric double layer formation. Here, we report the electrochemical study on the charging/reaction process at the interface of EGaIn liquid metal and electrolyte. Numerical fitting of the charging current curves provides the capacitance of EGaIn/insulating layer/electrolyte (${\sim}38F/m^2$). This value is two orders of magnitude higher than a capacitance of a general metal electrode/electrolyte interface.
Keywords
Eutectic Gallium-indium liquid metal; Supercapacitor; Oxide layer; Electrochemistry; Electric double-layer;
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