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Effect of nanofluidic electrolyte on the electrochemically enhanced long‐term efficiency of vanadium redox flow battery
Author(s) -
Kim Jungmyung,
Park Heesung
Publication year - 2019
Publication title -
energy storage
Language(s) - English
Resource type - Journals
ISSN - 2578-4862
DOI - 10.1002/est2.90
Subject(s) - electrolyte , flow battery , vanadium , electrochemistry , materials science , redox , chemical engineering , battery (electricity) , carbon nanotube , nanotechnology , inorganic chemistry , electrode , chemistry , metallurgy , power (physics) , physics , quantum mechanics , engineering
The low‐energy density of flow batteries using aqueous electrolytes such as vanadium redox flow batteries is a limitation of commercialization. Our ground‐breaking research has increased the limited energy density by 21.5% and the reversibility to oxidation/reduction by 8.5% through a nanofluidic electrolyte in which commercial multiwalled carbon nanotubes (MWCNTs) are dispersed in an electrolyte. Three nanofluidic electrolytes (0.05, 0.1, and 0.2 wt%) are prepared according to the electrolyte weight ratio and electrochemical performance is verified experimentally through half‐cell and single‐cell test. The increased active area due to the graphitic edge sites of MWCNT is an effective nanofluidic electrolyte to increase electrochemical performance. Our research provides the concept of nanofluidic electrolytes for increasing the electrochemical performance of VRFB, and the weight ratio of the optimal nanofluidic electrolyte of the vanadium redox flow battery electrolyte through single‐cell test is 0.1 wt% MWCNTs.