Multi-TpyCo²⁺-based conductive supramolecular hydrogels constructed by “bridge bonds” for rechargeable Zn-air batteries with ultrastable cycling stability over 1100 h

Abstract

For supramolecular hydrogels, the deep understanding of the gelation process and exploration of their rechargeable electrochemical battery remains a significant challenge. Herein, this paper demonstrates a series of novel multi-TpyCo2+-based...

Metal–organic gels and their derived materials for electrochemical applications

“…The same group further developed supramolecular hydrogels based on multi-terpyridyl Co 2+ complexes where the gelation driving forces are hydrogen bonding and π–π interactions. 175 The (Tpy) 4 Co 4 MOG shows charge-transfer resistance of 12.6 Ω and oxygen evolution ability with a low overpotential of 264 mV at 10 mA cm −2 and 301 mV at 100 mA cm −2 . Using (Tpy) 4 Co 4 as an air cathode, the liquid rechargeable zinc–air battery has long-term cycling stability of over 1100 h at 2 mA cm −2 and high energy efficiency of 65.3%.…”

Sustainable zinc–air battery chemistry: advances, challenges and prospects

“…216 Liu et al synthesized three-coordinated Co sites (3N-Co or tpy-Co 2+ ) via the self-assembly strategy, achieving an ultralong cycling stability of 5500 cycles and high energy efficiency of 65.3% in ZABs. 217 The coordinatively unsaturated metal atoms and the electronic coupling effect of different metal atoms further improved the activity. Lou et al prepared an NiMn-based bimetal–organic framework nanosheet grown on multi-channel carbon fibers (MCCF/NiMn MOF) as a bifunctional oxygen electrocatalyst (Fig.…”