Preparation of CuMn2O4/Ti3C2 MXene composite electrodes for supercapacitors with high energy density and study on their charge transfer kinetics

Sonali A. Beknalkar, Aviraj M. Teli, Atul C. Khot, Sagar M. Mane, Jae Cheol Shin

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

In this study, we present a novel electrode material that combines Ti3C2 MXene and high-capacity CuMn2O4 to increase the energy density of supercapacitors, which are a popular choice for energy storage due to their high-performance potential. The electrode material was synthesized using the hydrothermal method with varying deposition times (3 h, 6 h and 9 h), and the resulting composite materials were characterized using advanced analytical techniques. The CuMn2O4/MXene composite electrode synthesized at 3h exhibited exceptional performance, with a specific capacitance of 628 mF/cm2 at 4 mA/cm2, due to the enhanced electrical conductivity and charge storage properties of CuMn2O4 and MXene sheets. We also uncovered an intricate charge transfer mechanism and storage kinetics of CuMn2O4/MXene composite on a nickel foam electrode, revealing a diffusion-controlled energy storage mechanism with fast mass transportation. To demonstrate practicality, we constructed an asymmetric coin cell supercapacitor device using CuMn2O4/MXene composite synthesized at 3h and activated carbon as the positive and negative electrodes, respectively. The device showed a specific capacitance of 496 mF/cm2 at 6 mA/cm2 with cyclic stability of 80% for up to 10,000 cycles, and a power density of 1.5 mW/cm2 at a higher energy density of 0.073 mWh/cm2. Our results demonstrate the potential to significantly advance the development of high-performance supercapacitors by combining Ti3C2 MXene and high-capacity oxides, refining the synthesis process, and exploring innovative electrode architectures.

Original languageEnglish
Pages (from-to)31236-31247
Number of pages12
JournalCeramics International
Volume49
Issue number19
DOIs
StatePublished - 1 Oct 2023

Keywords

  • Charge storage kinetics
  • CuMnO
  • High performance energy storage
  • TiC Mxene

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