Synergistic Interface-Assisted Electrode-Electrolyte Coupling Toward Advanced Charge Storage

Synergistic Interface-Assisted Electrode-Electrolyte Coupling Toward Advanced Charge Storage

© 2020 Wiley-VCH GmbH.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 32(2020), 43 vom: 26. Okt., Seite e2005344
1. Verfasser: Sun, Shuo (VerfasserIn)
Weitere Verfasser: Rao, Dewei, Zhai, Teng, Liu, Qi, Huang, Hao, Liu, Bo, Zhang, Hongshen, Xue, Liang, Xia, Hui
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2020
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article charge storage coupling dipole-dipole interface self-discharge
Beschreibung
Zusammenfassung:© 2020 Wiley-VCH GmbH.
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 Co3 O4 electrode via formation of CoN bonds, creating a synergistic interface between the electrode and the RE. With such an interface, the coupled Co3 O4 -RE system exhibits greatly enhanced charge storage from both Co3 O4 and RE, delivering a large reversible capacity of ≈1000 mC cm-2 together with greatly reduced self-discharge. The significantly improved electrochemical activity of Co3 O4 can be attributed to the tuned work function via charge injection from Fe(CN)6 4- , while the greatly enhanced adsorption of K3 Fe(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
Beschreibung:Date Revised 26.10.2020
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.202005344