Work

Large Capacitance Enhancement Achieved via Tuning Electrode/Electrolyte Thickness of Graphene Oxide‐Based All‐Solid‐State Supercapacitors

Year: 2025

Type: article

Abstract: Graphene oxide-based all-solid-state supercapacitors (GO ASSCs) provide a to-the-point opportunity of integrating miniaturized energy storage devices on a single chip with operation-ability and safety superiority over liquid electrolyte-based SCs, yet their capacitance needs to be improved. Based on the lamellar MXene-GO ASSC structure energy density of the GO ASSCs can be brought up to the level comparable to their counterparts using liquid electrolytes via simple tuning the MXene/GO thickness. During analyzing how the GO and MXene thickness affects the electrochemical performance, a major paradox is noticed between the high capacitance of up to two hundreds of farads per gram achievable with specific MXene/GO thickness combination, and its seemly slow diffusion kinetics. In situ pressure test is designed, and a quick capacitance saturation validated enhanced "charge storage efficiency" of the specific MXene/GO thickness combination, further revealing a possible delicate balance acquired between the solid electrolyte and the electrodes to break the restriction on ion diffusion. The findings should provide a straightforward solution in achieving high capacitance performance for the ASSCs using GO solid electrolyte and MXene or other pseudocapacitive electrode materials.

Source: Small

DOI: 10.1002/smll.202501802

Authors: Xing Wei, Junru Wang, Rui Chen, Zhijiang Zhang, Qing Zhang

Institution: Anhui University

Language: English

Topic: Supercapacitor Materials and Fabrication

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: bronze

Funder: National Natural Science Foundation of China