Excellent oxidation resistive MXene aqueous ink for micro-supercapacitor application

By Chien-Wei Wu, B. Unnikrishnan, I. P. Chen, Scott G. Harroun, Huan‐Tsung Chang, Chih-Ching Huang. 2020

294 citations recorded by the source corpus.

Abstract Uniform and stable interdigitated electrodes are essential for planar micro-supercapacitor applications. Two-dimensional (2D) materials, such as transition-metal MXenes have become attractive nanomaterials for micro-supercapacitor applications due to their layered structure and high electrical conductivity. However, the low stability of MXenes in aqueous media limits their long-term storage and application. Here, we demonstrate in-situ synthesis and capping of Ti3C2Tx MXenes with sodium ascorbate (SA) to obtain SA-MXene dispersion with high resistance against oxidation even after 80 days of storage at ambient temperature and exposed to air. The in-situ synthesis process increases the interlayer spacing of SA-MXene sheets, and increases their energy storage efficiency, without compromising their electrical conductivity. A printable SA-MXene ink was prepared with Triton X-100 and propylene glycol as modifiers to print interdigitated micro-supercapacitor electrodes with an inkjet printer. Our solid-state micro-supercapacitor made without current collector exhibits areal and volumetric capacitance of 108.1 mF cm−2 and 720.7 F cm−3, respectively. This work highlights the potential application of ligand-capped stable MXenes as a water-based ink in printing devices for the fabrication of micro-electronics and supercapacitors.

Subfields: Biomedical Engineering, Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/cb5e6e18ceab198af2f67b2f040b956cdedc805c