Ti3C2Tx/carbon nanotubes/porous carbon film for flexible supercapacitors

source：beike new material Views：2891time：2021-10-15 QQ Academic Group: 1092348845

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1. Article overview

Porous carbon PC can effectively alleviate the typical self-stacking phenomenon of two-dimensional mxene-based films, and can easily customize its porous structure. However, due to the irregular shape of the PC, the contact between the 3D PC and the 2D MXene sheet is usually point-to-point, resulting in low electron transfer efficiency, stress concentration in the film and fragility. The article introduces one-dimensional carbon nanotubes CNT to build a highly conductive network structure, anchors PC tightly on the MXene sheet, and ensures fast electron transfer by increasing the contact area between MXenn and PC. In addition, the interwoven CNTs bridge the horizontal MXene sheet to make the internal structure more complete, thereby increasing flexibility. Therefore, the typical MXene/CNT/PC TCP film of Ti3C2Tx can withstand a large scan rate of 1 V s-1, and shows a high area specific capacitance of 364.8 mF cm-2 at 0.5 mA cm-2. It remains above 80% even at a high current density of 50 mA cm-2. In addition, the prepared flexible quasi-solid supercapacitor SC has a large area energy density of 10.5 μ Wh cm-2 at 29.8 μ W cm-2. The article research provides a promising method for MXene/PC film to overcome the problem of poor flexibility without sacrificing conductivity, and pave the way for the development of flexible sc with large charge storage capacity and high rate performance.

Two, graphic guide

Figure 1. Process route for preparing Ti3C2Tx/CNT/PC thin film by vacuum assisted filtration.

Figure 2. Morphology characterization of Ti3C2Tx, TP and TCP films: (a) Structure description of Ti3C2Tx, TP and (b) TCP; (c) Ti3C2Tx, (d) TP and (e) SEM cross-sectional images of TCP; (f) ) HR-TEM image of TCP, (g) magnified lattice fringes, (h) amorphous carbon of PC, (i) SAED pattern.

Figure 3. Physical and chemical characterization of Ti3C2Tx, TC and TCP films: (a) XRD spectrum, (b) Raman spectrum, (c) N2 adsorption and desorption isotherm, (d) pore size distribution based on DFT model, (e) XPS spectrum and (f) Ti 2p spectrum.

Figure 4. Capacitance performance of Ti3C2Tx, TC and TCP films: (a) CV spectra of TCP films at different scan rates; (b) Rate capability based on GCD spectra; (c) Nyquist diagram; (d) Ti3C2Tx and TCP films Description of ion transport in.

3. Full text summary

In summary, a porous, flexible, electrochemically active TCP membrane was successfully prepared by vacuum filtration. As a spacer, PC effectively separates adjacent Ti3C2Tx flakes, increases the ionic accessible surface area of Ti3C2Tx, and provides abundant multidirectional fast ion diffusion channels due to its macroscopic/mesoporous structure. The TCP film has ideal flexibility and high conductivity, thanks to the conductive network composed of carbon nanotubes. The interweaving of CNTs not only fixes the PC tightly on Ti3C2Tx, but also increases the electron transfer efficiency by increasing the contact area between Ti3C2Tx and PC. It also bridges the horizontally adjacent Ti3C2Tx sheets to make the internal structure more complete and enhance flexibility. sex. Therefore, the TCP film can withstand a large scan rate of 1v s-1, and exhibits a large area specific capacitance of 364.8 mF cm-2 at 0.5 mA cm-2. When the current density is increased by 100 times, the area specific capacitance remains at More than 80%. Benefiting from its electrochemical attractive properties, the fabricated flexible SC with gel electrolyte exhibits a large area capacitance of 212 mF cm-2 at 0.1 mA cm-2 and 10.5 μWh cm-2 at 29.8 μW cm-2 The large-area energy density has an excellent magnification capability of more than 75%, and the power density is increased by about 100 times. The article research provides a promising strategy for the Ti3C2Tx film to overcome the self-stacking phenomenon of the film without sacrificing conductivity and flexibility. At the same time, it paves the way for the development of flexible sc with large charge storage capacity and high rate capability. .

Article link: https://doi.org/10.1016/j.cej.2021.132002

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