Supercapattery-Diode: Using Layered Double Hydroxide Nanosheets for Unidirectional Energy Storage.

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Supercapacitor-diode (CAPode) devices combine energy storage and ionic rectification.
• Existing CAPodes have limitations in simultaneous energy storage and rectification performance.
• Iontronics, AC rectifiers, and biomedical applications require efficient CAPode devices.

Purpose of the Study:

• To develop a novel aqueous-phase supercapattery-diode with improved energy storage and rectification.
• To investigate the integration of battery-type layered double hydroxide (LDH) nanosheets for enhanced CAPode performance.
• To demonstrate the potential of LDH redox chemistry in advancing CAPode functionality.

Main Methods:

• Fabrication of an aqueous-phase supercapattery-diode using layered double hydroxide (LDH) nanosheets.
• Asymmetric device configuration utilizing KOH electrolyte.
• Electrochemical characterization to evaluate energy storage and rectifying properties.

Main Results:

• Achieved high specific capacity (162 C g⁻¹) and energy density (34 W h kg⁻¹).
• Demonstrated excellent rectification ratios (RR_I = 23, RR_II = 0.98).
• Unidirectional energy storage attributed to ion-selective LDH redox reactions.

Conclusions:

• The novel supercapattery-diode exhibits superior energy storage and rectification capabilities.
• Integrating battery-type LDH and their redox chemistry simultaneously enhances charge storage and rectification.
• This work expands CAPode types and highlights the potential of LDH in iontronics.