Unveiling the Electrochemical Reversibility of Multielectron Redox in s‐Tetrazine Derivatives for Large‐Capacity Electrode Materials
Year: 2025
Type: article
Abstract: 1,2,4,5‐tetrazine (s‐tetrazine) is a promising redox center for organic electrode materials due to its low molecular weight and ability to undergo two‐electron redox reactions. However, in practice, the irreversibility of the second‐electron transfer has often limited the specific capacities of the s‐tetrazine‐based electrodes in metal‐organic cells. Herein, electrochemically reversible two‐electron‐transfer processes from the s‐tetrazine core are demonstrated by introducing electron‐withdrawing pyridine rings at 3‐ and 6‐positions. Comparative analysis of three s‐tetrazine derivatives, 3,6‐diphenyl‐1,2,4,5‐tetrazine ( Ph‐Tz ), 3,6‐di(4‐pyridinyl)‐1,2,4,5‐tetrazine ( 4‐Py‐Tz ), and 3,6‐di(2‐pyridinyl)‐1,2,4,5‐tetrazine ( 2‐Py‐Tz ) reveals that both electron‐withdrawing effect and Li‐ion coordination play critical roles in redox reversibility. Among them, 2‐Py‐Tz exhibits the highest electron‐transfer rate with Li + diffusion coefficient attributed to the ortho ‐positioned pyridine nitrogen atoms, which strongly stabilize the dianion state through synergistic electron‐withdrawing and Li‐ion locking effects.
Source: ChemSusChem
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,550
OpenAlex ID: W4415789265