Radical Stabilization of a Tripyridinium-Triazine Molecule Enables Reversible Storage of Multiple Electrons

作者：Huang, Jinghua; Hu, Shuzhi^*; Yuan, Xianzhi; Xiang, Zhipeng; Huang, Mingbao; Wan, Kai; Piao, Jinhua; Fu, Zhiyong; Liang, Zhenxing^*

来源：Angewandte Chemie - International Edition, 2021, 60(38): 20921-20925.

DOI：10.1002/anie.202107216

• aqueous
• multi-electron storage
• pyridinium
• radical stabilization
• triazine

A novel organic molecule, 2,4,6-tris[1-(trimethylamonium)propyl-4-pyridiniumyl]-1,3,5-triazine hexachloride, was developed as a reversible six-electron storage electrolyte for use in an aqueous redox flow battery (ARFB). Physicochemical characterization reveals that the molecule evolves from a radical to a biradical and finally to a quinoid structure upon accepting four electrons. Both the diffusion coefficient and the rate constant were sufficiently high to run a flow battery with low concentration and kinetics polarization losses. In a demonstration unit, the assembled flow battery affords a high specific capacity of 33.0 Ah L-1 and a peak power density of 273 mW cm(-2). This work highlights the rational design of electroactive organics that can manipulate multi-electron transfer in a reversible way, which will pave the way to development of energy-dense, manageable and low-cost ARFBs.

• 单位
  中山大学