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- Title
Mitigating Ring‐Opening to Develop Stable TEMPO Catholytes for pH‐Neutral All‐Organic Redox Flow Batteries.
- Authors
Fan, Hao; Wu, Wenda; Ravivarma, Mahalingam; Li, Hongbin; Hu, Bo; Lei, Jiafeng; Feng, Yangyang; Sun, Xiaohua; Song, Jiangxuan; Liu, Tianbiao Leo
- Abstract
Redox‐active organics are highly attractive in aqueous organic redox flow batteries (AORFBs). However, the lack of capacity dense, stable organic catholytes remains a challenge to develop energy‐dense, long cycle‐life AORFBs. Herein, a stable organic catholyte, 4‐[3‐(trimethylammonium)acetylamino]‐2,2,6,6‐tetramethylpiperidine‐1‐oxyl chloride (TMAAcNHTEMPO) is developed through rational molecular engineering using connective acetamido and trimethylammonium groups. Paired with bis‐(trimethylammonium) propyl viologen tetrachloride anolyte, stable AORFBs (up to 1500 cycles) with a low capacity fade rate of ca. 0.0144% h−1 are achieved. Experimental characterizations and theoretical simulations revealed that TMAAcNH‐TEMPO is largely stabilized by the reduced reactivity of the nitroxyl radical moiety that mitigates a ring‐opening side reaction.
- Subjects
FLOW batteries; OXIDATION-reduction reaction; RING-opening reactions; NITROXYL; SOLID state batteries; MOIETIES (Chemistry); ALCOHOL oxidation
- Publication
Advanced Functional Materials, 2022, Vol 32, Issue 33, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.202203032