Molecular size exclusion effect extending the cycling stability of a non-aqueous redox flow battery

Author:

Mohapatra Sandeep Kumar1ORCID,Ramanujam Kothandaraman2ORCID,Sankararaman Sethuraman1ORCID

Affiliation:

1. Clean Energy Laboratory, Department of Chemistry, Indian Institute of Technology Madras 1 , Chennai 600 036, Tamil Nadu, India

2. Advanced Centre for Energy Storage and Conversion-The Energy Consortium, Indian Institute of Technology Madras 2 , Chennai 600036, India

Abstract

Non-aqueous organic redox flow batteries (NAORFBs) suffer from rapid capacity fading mainly due to the crossover of redox-active species across the membrane. Minimizing the crossover of redox-active species through ion exchange membranes remains a complex challenge in NAORFBs. To address the crossover issue, we approached the problem through a molecular size exclusion principle designing a dimer of viologen derivative as an anode material. Coupled with N-hexyl phenothiazine as a catholyte, a static cell was demonstrated, which exhibits an excellent cycling stability (100 cycles) with an average Coulombic efficiency of 90% at 10 mA cm−2 current density.

Funder

Department of Science and Technology, Ministry of Science and Technology, India

Publisher

AIP Publishing

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