Journal
ADVANCED MATERIALS
Volume 32, Issue 43, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202005344
Keywords
charge storage; coupling; dipole-dipole; interface; self-discharge
Categories
Funding
- National Natural Science Foundation of China [51772154, 51602158, 51972174]
- Natural Science Foundation of Jiangsu Province [BK20160835, BK20170036]
- Fundamental Research Funds for the Central Universities [30919011108]
- Science and Technology Program of Tianjin, China [17PTYJGX00050]
- Jiangsu Overseas Visiting Sholar Program for University Prominent Young and Mid-aged Teachers and Presidents
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Owing to the limited charge storage capability of transitional metal oxides in aqueous electrolytes, the use of redox electrolytes (RE) represents a promising strategy to further increase the energy density of aqueous batteries or pseudocapacitors. The usual coupling of an electrode and an RE possesses weak electrode/RE interaction and weak adsorption of redox moieties on the electrode, resulting in a low capacity contribution and fast self-discharge. In this work, Fe(CN)(6)(4-)groups are grafted on the surface of Co(3)O(4)electrode via formation of Co-N bonds, creating a synergistic interface between the electrode and the RE. With such an interface, the coupled Co3O4-RE system exhibits greatly enhanced charge storage from both Co(3)O(4)and RE, delivering a large reversible capacity of approximate to 1000 mC cm(-2)together with greatly reduced self-discharge. The significantly improved electrochemical activity of Co(3)O(4)can be attributed to the tuned work function via charge injection from Fe(CN)(6)(4-), while the greatly enhanced adsorption of K3Fe(CN)(6)molecules is achieved by the interface induced dipole-dipole interaction on the liquid side. Furthermore, this enhanced electrode-electrolyte coupling is also applicable in the NiO-RE system, demonstrating that the synergistic interface design can be a general strategy to integrate electrode and electrolyte for high-performance energy storage devices.
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