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Electrochemical Evaluation of Diketopyrrolopyrrole Derivatives for Nonaqueous Redox Flow Batteries
Author(s) -
Sharma Shikha,
Rathod Suman,
Prakash Yadav Satya,
Chakraborty Arunavo,
Shukla Ashok K.,
Aetukuri Nagaphani,
Patil Satish
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202101516
Subject(s) - redox , electrochemistry , electrolyte , cyclic voltammetry , chemistry , inorganic chemistry , reactivity (psychology) , materials science , chemical engineering , electrode , medicine , alternative medicine , pathology , engineering
Redox flow batteries (RFBs) employing nonaqueous electrolytes could potentially operate at much higher cell voltages, and therefore afford higher energy and power densities, than RFBs employing aqueous electrolytes. The development of such high‐voltage nonaqueous RFBs requires anolytes that are electrochemically stable, especially in the presence of traces of oxygen and/or moisture. The inherent atmospheric reactivity of anolytes mandates judicious molecular design with high electron affinity and electrochemical stability. In this study, diketopyrrolopyrrole (DPP)‐based TDPP‐Hex‐CN 4 is proposed as a stable redox‐active molecule for anolytes in nonaqueous organic RFBs. We demonstrate organic RFBs using TDPP‐Hex‐CN 4 as anolyte with unisol blue (UB) 1,4‐bis(isopropylamino)anthraquinone and 1,4‐di‐ tert ‐butyl‐2,5‐bis(2‐methoxyethoxy)benzene (DBBB) as catholytes. Cyclic voltammetry measurements with scans repeated over 200 cycles were performed to establish the electrochemical stability of the redox pairs. Symmetric flow‐cell studies show that TDPP‐Hex‐CN 4 exhibits stable capacity up to 700 cycles. Redox flow cells employing TDPP‐Hex‐CN 4 /UB and TDPP‐Hex‐CN 4 /DBBB as redox pairs demonstrate that DPP derivatives are propitious materials for anolytes in all organic nonaqueous RFBs.