Highly soluble and crossover-free all-organic redox pair using N-heterocycle-linked TEMPO and two-electron-capable bipyridinium towards high performance aqueous flow batteries - Mingguang Pan; Zhong Jin; Tianshou Zhao; Jianwei Sun; Zhihu You; Ernest Pahuyo Delmo; Mohammad Farhadpour; Zuoao Wu; Minhua Shao (Chemical Engineering Journal, 2024)