Communication—Tris(bipyridyl)iron Complexes for High-Voltage Aqueous Redox Flow Batteries. Issue 10 (23rd June 2020)

• Record Type: Journal Article
• Authors: Ruan, Wenqing; Mao, Jiatao; Yang, Shida; Chen, Qing
• Is Part Of: Journal of the Electrochemical Society. Volume 167:Issue 10(2020)
• Publication Date: 2020-06-23
• Subjects: redox flow batteries -- iron complex -- dimerization; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/1945-7111/ab9cc8
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : While the choices of active materials for redox flow batteries (RFBs) have grown substantially, very few can adequately serve in the positive side of a RFB. We attempt to address the challenge with an inexpensive, high-potential tris(bipyridyl)iron complex. Paired with methyl viologen, the complex enables a 1.4 V neutral RFB with 215 cycles at a current efficiency of 99.8% and capacity retention over 99.9% per cycle. The discharging process displays two peculiar plateaus due to the dimerization of ferric complexes, as confirmed by ex situ cyclic voltammetry and the UV–vis spectroscopy.