Electrochemical Evaluation of a Napthalene Diimide Derivative for Potential Application in Aqueous Organic Redox Flow Batteries
Journal article, 2019

A quaternary amine-functionalized naphthalene diimide (NDI) moiety is synthesized and considered as a redox-active species for application in aqueous organic redox flow batteries. For the first time, this NDI is characterized electrochemically in aqueous solutions, using cyclic and rotating disk electrode voltammetry, bulk electrolysis, as well as 1H-nuclear magnetic resonance (1H-NMR) spectroscopy. The molecule reaches a solubility of 0.68 m in water and reversibly delivers two electrons at attractive potentials for flow battery applications. Further exploration with 1H-NMR reveals a strong dimerization of the NDI species with an equilibrium constant of 146 m−1. Using diffusion NMR coupled with rotating disk electrode voltammetry, it is shown that the dimer retains limited redox-activity, yielding two electrons per dimer unit. However, using galvanostatic bulk electrolysis, close to the theoretical capacity is obtained, indicating a fast dissociation reaction of the reduced dimer. Finally, the NDI species shows excellent stability; after constant cycling for 1 week, no degradation is detected. In conclusion, NDI is demonstrated to be a highly attractive candidate for aqueous redox flow batteries.

electrochemistry

organic redox flow batteries

nuclear magnetic resonance spectroscopy

rotating disk electrode voltammetry

naphthalene diimide

Author

Cedrik Wiberg

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Lars Nordstierna Group

Francis Owusu

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Ergang Wang Group

Ergang Wang

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Ergang Wang Group

Elisabet Ahlberg

University of Gothenburg

Energy Technology

21944288 (ISSN) 21944296 (eISSN)

Vol. 7 11 1900843

Subject Categories

Inorganic Chemistry

Other Chemical Engineering

Organic Chemistry

DOI

10.1002/ente.201900843

More information

Latest update

11/8/2019