Ethylene diamine–assisted capillary impregnation of NiO@Ti3C2 MXene composites from MAX phase for enhanced supercapacitor applications
Year: 2026
Type: article
Abstract: The development of sustainable, high-performance supercapacitors is essential for advancing next-generation energy storage technologies. In this work, Nickel Oxide (NiO)/Ti3C2 MXene composites are designed to overcome the inherent self-stacking issue of MXenes while enhancing electrochemical properties. Ti3C2 MXene nanosheets were prepared via selective etching of Ti3AlC2 MAX phase using LiF/HCl, followed by the uniform incorporation of NiO nanoflakes through a novel ethylenediamine-assisted capillary impregnation process. Structural characterization confirmed the successful intercalation of NiO, which effectively prevented MXene restacking and provided additional surface sites for OH− ion adsorption and participation in redox reaction for charge storage. Ni2+ ions form NiO nanoflakes between and on Ti3C2 layers, enabling uniform dispersion and strong coupling. The Ni2+ ↔ Ni3 redox activity with Ti3C2 conductivity enhances OH− accessibility and boosts capacitance. Electrochemical evaluations revealed that the optimized NiO@Ti3C2 composite delivers a high specific capacitance of 256 F g−1 at 1 A g−1, an energy density of 68 Wh kg−1, and excellent cycling stability with 95% capacitance retention over 5,000 cycles. The synergistic combination of the high conductivity of Ti3C2 and the faradaic redox activity of NiO leads to superior electrochemical performance and structural durability. This strategy offers a promising and sustainable pathway toward the development of advanced supercapacitors for efficient energy storage applications.
Source: Materials Today Advances
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,790
OpenAlex ID: W7141148660