Kinetics of the charge/discharge characteristics of redox flow battery electrolytes
Date
2011
Authors
Modiba P.
Matoetoe M.
Crouch A.M.
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
A comparison of the electrochemical behavior of Ce(IV) and its complexes of ethylenedi-aminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA), ethylenedia-minedisuccinic acid (EDDS), and nitrilotriacetic acid (NTA) using cyclic voltammetry (CV) and rotating disc electrode (RDE) on Pt-electrode were carried out. All complexes had an anodic cathodic ratio greater than 1. The Ce(IV)-DTPA had the best properties: highest peak potential, better reversibility, and higher peak current. Potential usage of the Ce(IV)-DTPA in redox flow batteries (RFB) was confirmed by the electrochemical impedance spectroscopy results: lowest electrolyte and charge transfer resistance. The performance evaluation of RFB employing Ce(IV) and Ce(IV) complexes of DTPA and EDTA with constant current charge/discharge analysis proved that CE(IV)-DTPA complex has a potential as an anode in RFB. A maximum potential of 1V and a minimum voltage of 2 V were achieved. Highest energy, voltage, and coulombic efficiencies of 85%, 93%, and 92% were obtained, respectively. © Taylor & Francis Group, LLC.
Description
Keywords
CE(IV)-DTPA, Cerium, Charge=discharge, Complexes, Electrochemical impedance spectroscopy, Redox flow battery
Citation
Analytical Letters
44
11
http://www.scopus.com/inward/record.url?eid=2-s2.0-80051705578&partnerID=40&md5=157b6c2fd2341b8e9ca222ba5d44c41d
44
11
http://www.scopus.com/inward/record.url?eid=2-s2.0-80051705578&partnerID=40&md5=157b6c2fd2341b8e9ca222ba5d44c41d