A Conjugately Configured Supercapacitor with Suppressed Self-Discharge by Coupling Pairs of Presodiated Manganese Oxides

Abstract

The wider application of conventional electrochemical double-layer supercapacitors is limited by severe self-discharge. Current strategies for tackling self-discharge are mainly focused on each specific component of the device, while a general approach based on configuration design from the device level is largely unknown. Herein, we report a conjugated supercapacitor based on pairs of presodiated manganese oxides with the unique working mechanism of redox pseudocapacitance. Upon aging, the holding time for voltage dropping from 1.0 to 0.4 V for the conjugated device based on Na x δ-MnO2 vs Na1–x δ-MnO2 is four times longer than that of an activated carbon (AC) vs AC device. The successful suppression of self-discharge based on designing device configuration is expected to be universally viable for other capacitive materials.

Conjugated supercapacitor with suppressed self‐discharge constructed by pairs of prelithiated Nb2O5@C with optimized elemental and phase purity in the carbon shell

“…Conjugation is the concept of describing a matched pair of subjects that can interconvert under a certain rule. [ 31 ] It is widely used in different disciplines and is generally found to improve the stability of the system. [ 32 ] In chemistry, conjugated bonds can change the distribution of electron cloud density and reduce the internal energy, thus stabilizing the entire molecule.…”

Screening the deep eutectic electrolytes for supercapacitors with alleviated self-discharge

“…High-performance energy storage technologies are key elements for the rising energy crisis. [1][2][3][4][5][6][7][8][9] Compared to traditional batteries, supercapacitors show many advantages such as high-power densities and excellent cycling stability. [10][11][12][13] Nevertheless, selfdischarge has placed severe limitations on the wider applications of electrochemical double layer capacitors (EDLCs).…”