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. 2024 Feb 1;15(2):234.
doi: 10.3390/mi15020234.

Synergistic Charge Storage Enhancement in Supercapacitors via Ti3C2Tx MXene and CoMoO4 Nanoparticles

Christine Young  1 , An-Yi Wu  1 , Ri-Yu Li  1
Affiliations

Synergistic Charge Storage Enhancement in Supercapacitors via Ti3C2Tx MXene and CoMoO4 Nanoparticles

Christine Young et al. Micromachines (Basel). .

Abstract

MXene has emerged as a highly promising two-dimensional (2D) layered material with inherent advantages as an electrode material, such as a high electrical conductivity and spacious layer distances conducive to efficient ion transport. Despite these merits, the practical implementation faces challenges due to MXene's low theoretical capacitance and issues related to restacking. In order to overcome these limitations, we undertook a strategic approach by integrating Ti3C2Tx MXene with cobalt molybdate (CoMoO4) nanoparticles. The CoMoO4 nanoparticles bring to the table rich redox activity, high theoretical capacitance, and exceptional catalytic properties. Employing a facile hydrothermal method, we synthesized CoMoO4/Ti3C2Tx heterostructures, leveraging urea as a size-controlling agent for the CoMoO4 precursors. This innovative heterostructure design utilizes Ti3C2Tx MXene as a spacer, effectively mitigating excessive agglomeration, while CoMoO4 contributes its enhanced redox reaction capabilities. The resulting CoMoO4/Ti3C2Tx MXene hybrid material exhibited 698 F g-1 at a scan rate of 5 mV s-1, surpassing that of the individual pristine Ti3C2Tx MXene (1.7 F g-1) and CoMoO4 materials (501 F g-1). This integration presents a promising avenue for optimizing MXene-based electrode materials, addressing challenges and unlocking their full potential in various applications.

Keywords: CoMoO4; MXene; binary transition metal oxides; supercapacitor.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Schematic illustration of the fabrication process for CMX heterostructure (CoMoO4/Ti3C2Tx MXene) samples.
Figure 2
Figure 2
SEM images of (a) Ti3C2Tx MXene, (b) CMX-1, (c) CMX-2, and (d) CMX-3 samples.
Figure 3
Figure 3
XRD patterns of CM and CMX-2 samples.
Figure 4
Figure 4
(a) TEM and (b,c) HRTEM images of CMX-2 samples. (d–i) EDX mapping of CMX-2 samples.
Figure 5
Figure 5
(a) Full XPS spectrum and high-resolution XPS spectra with raw data and fitted curves for the (b) Co 2p, (c) Mo 3d, and (d) C 1s peaks in CMX-2.
Figure 6
Figure 6
(a) CV curves and (b) GCD curves of CMX-2. (c,d) Capacitances and capacitance retentions for CM, CoX, MoX, CMX-2, CMX-2, and CMX-3 at various scan rates. (e) Nyquist plots for CMX-1, CMX-2, and CMX-3.
Figure 7
Figure 7
(a) The relation curve of redox peaks to scan rates of CMX-1, CMX-2, and CMX-3. (b) Evaluation of the surface capacitive and diffusion-controlled charge storage mechanisms at the scan rate of 0.1 mV s−1. Capacitive and diffusion-controlled contribution at various scan rates for (c) CMX-1, (d) CMX-2, and (e) CMX-3.
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