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

Shuo Sun1, Dewei Rao2, Teng Zhai1

  • 1School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.

Advanced Materials (Deerfield Beach, Fla.)
|September 21, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a synergistic interface for aqueous batteries by grafting Fe(CN)6 4- onto Co3 O4 electrodes. This significantly boosts energy storage capacity and reduces self-discharge, enhancing performance.

Keywords:
charge storagecouplingdipole-dipoleinterfaceself-discharge

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Transitional metal oxides have limited charge storage in aqueous electrolytes.
  • Redox electrolytes (RE) offer potential for higher energy density in aqueous batteries and pseudocapacitors.
  • Existing electrode-RE systems suffer from weak interactions, low capacity, and rapid self-discharge.

Purpose of the Study:

  • To enhance charge storage capability in aqueous batteries by creating a synergistic interface between electrode and redox electrolyte.
  • To improve electrode/RE interaction and redox moiety adsorption.
  • To reduce self-discharge rates and increase overall energy density.

Main Methods:

  • Grafting Fe(CN)6 4- groups onto a Co3 O4 electrode surface via Co-N bond formation.
  • Investigating the synergistic interface between the modified Co3 O4 electrode and a redox electrolyte.
  • Evaluating electrochemical performance, including reversible capacity and self-discharge characteristics.

Main Results:

  • The coupled Co3 O4 -RE system demonstrated significantly enhanced charge storage, achieving a reversible capacity of ≈1000 mC cm-2.
  • Self-discharge was greatly reduced due to improved electrode/RE interaction and enhanced redox moiety adsorption.
  • The enhanced electrochemical activity of Co3 O4 was attributed to a tuned work function via charge injection from Fe(CN)6 4-.

Conclusions:

  • The synergistic interface design effectively integrates electrode and electrolyte for high-performance energy storage.
  • This strategy is applicable to other materials, such as the NiO-RE system, indicating its generalizability.
  • The developed method offers a promising pathway for advancing aqueous battery and pseudocapacitor technology.