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Title: An organic bifunctional redox active material for symmetric aqueous redox flow battery

Journal Article · · Nano Energy
 [1];  [1];  [1];  [1];  [1];  [2];  [1]
  1. Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon (Hong Kong)
  2. Argonne National Lab. (ANL), Argonne, IL (United States); Stanford Univ., CA (United States); Imam AbduIrahman Bin Faisal Univ. (IAU), Dammam (Saudi Arabia)

Symmetric redox flow batteries utilizing a single redox active material as catholyte and anolyte, offer a plausible and unique strategy to alleviate cross-contamination issues during cycling, making them an ideal energy storage device for large scale applications. In this work, a low-cost riboflavin organic molecule is coupled with a 2,2,6,6-Tetramethylpiperidinyl-N-oxyl (TEMPO) radical molecule to form a single Riboflavin-TEMPO (RIBOTEMPO) bifunctional redox active material, which is used in both aqueous anolyte and catholyte. Cyclic voltammetry analysis of the combined molecule displays electrochemically reversible reactions for the redox couples at 0.72 V and 0.51 V versus Hg/Hg2SO4, leading to a theoretical cell voltage of 1.23 V. A symmetric cell testing demonstrated over 100 consecutive charge/discharge cycles with nearly 80% coulombic efficiency and capacity retention of 44.7% at a current density of 2.5 mA cm(-2). By utilizing a pH neutral supporting electrolyte, a lowcost, safe, and environmental-friendly redox flow battery is achieved. This work provides a pathway for the design and development of bifunctional redox active molecules for symmetric battery applications.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office; U.S.-China Clean Energy Research Center (CERC); Research Grants Council of the Hong Kong Special Administrative Region; USDOE
Grant/Contract Number:
AC02-06CH11357; T23-601/17-R
OSTI ID:
1866607
Alternate ID(s):
OSTI ID: 1869005
Journal Information:
Nano Energy, Vol. 89, Issue Part: B; ISSN 2211-2855
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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