Recent advances in MXene-based nanocomposites for supercapacitors

Abstract

MXene materials have become a competitive candidate for electrochemical energy storage due to their unique two-dimensional layered structure, high density, metal-like conductivity, fast ion intercalation, tunable surface terminal groups, and good mechanical flexibilities, showing unique application advantages in the field of supercapacitors. With widely research of MXene in energy storage applications, plenty of studies in synthesis strategies of MXene, including etching, intercalation and exfoliation processes, and its charge storage mechanism in supercapacitors have been conducted. However, the restacking of two-dimensional (2D) MXene nanosheets severely affects their electrochemical performance. To prevent the stacking of MXene, MXene-based nanocomposite electrode materials have been developed with remarkable electrochemical performance by incorporating conventional active capacitive materials, including metal oxides/sulfides and conductive polymers, with MXene. This review summarizes the etching strategies of MXenes and selection of intercalants, also discusses the charge storage mechanism of MXenes in aqueous and nonaqueous electrolytes. It mainly expounds the preparation strategies and applications of MXene-based nanocomposites in supercapacitors, including MXene/metal oxide, MXene/metal sulfide, MXene/conducting polymer, and MXene/carbon-based composites. Additionally, the advantages of combining MXene with other active materials in supercapacitor applications, which support its promising prospects, are discussed. Finally, the critical challenges faced by MXene-based nanocomposites in long-term research are mentioned.

Revolutionizing Supercapacitors with Next-Level Performance: Developing an Innovative MXene-Based Cobalt Oxide Composite Electrode for Enhanced Supercapacitive Energy Storage Applications

“…Understanding the nano-electrode electrochemical activity is greatly aided by these currents. 52 The largest current measured during the forward scan as the potential increases is the anodic peak current (Ipa). The oxidation process at the electrode surface, where electroactive species are oxidized and release electrons is linked to this magnitude of the current.…”

Probing Thermal Transport on a Suspended Ti3C2Tx MXene Film via a Photothermally Actuated Resonator

“…Furthermore, the effect of MXene thermal performance is not negligible in pressure/mass resonant sensors, since the resonant frequency is affected by the change in temperature, which causes errors in the highly sensitive MXene sensors. 18,19 Liu et al measured the thermal conductivity value of 55.8 W/m•K for Ti 3 C 2 T x MXene films by the laser flash method and Raman spectroscopy. However, the film measured is fabricated from undelaminated multilayered Ti 3 C 2 T x , which is different from the delaminated Ti 3 C 2 T x MXene film used in most sensors.…”

“…For example, in the studies of electrodes for batteries made of MXene, the charging/discharging rate of the battery is directly affected by the thermal conductivity of MXene. , Meanwhile, the temperature change of the battery can be predicted to avoid the occurrence of a thermal runaway. Furthermore, the effect of MXene thermal performance is not negligible in pressure/mass resonant sensors, since the resonant frequency is affected by the change in temperature, which causes errors in the highly sensitive MXene sensors. , Liu et al measured the thermal conductivity value of 55.8 W/m·K for Ti 3 C 2 T x MXene films by the laser flash method and Raman spectroscopy. However, the film measured is fabricated from undelaminated multilayered Ti 3 C 2 T x , which is different from the delaminated Ti 3 C 2 T x MXene film used in most sensors .…”

An ammonium vanadate/MXene nanocomposite for high-performance ammonium ion storage

“…16,17 MXenes are another class of layered materials synthesized using the wet etching technique from the parent MAX phase. 18–20 Furthermore, there are research reports on improving the electrochemical performance of layered materials with MXenes. 21–25 MXenes possess excellent properties such as high metallic conductivity (6000–8000 S cm −1 ) and appreciable thermal conductivity, solvated ion intercalation property, variable surface functional groups, and larger hydrophilicity.…”