Constructing MXene-PANI@MWCNTs heterojunction with high specific capacitance towards flexible micro-supercapacitor

Abstract

Micro-supercapacitors (MSCs) are considered as the promising energy supply of miniaturized electronic devices. The electrode material, as one integral part, play a crucial role on the energy storage performance of MSCs. In our work, we constructed a heterojunction in MXene-PANI@MWCNTs (MPM) ternary composite, benefitting for the synergistic enhancement effect among MXene, polyaniline (PANI) and multiwall carbon nanotubes (MWCNTs), an outstanding specific capacitance of 414 F/g (at 1A/g) has been achieved. MPM shows high capacitance retention at large current density (86.7%, at 10A/g) and long-term cycling stability of 90.4% for 10,000 cycles. Furthermore, we obtained MPM self-standing films, and constructed a flexible all-solid-state MSC based on the film electrode. A competitive charge storage capability of 30.2 mF/cm2 and long-term stability of 70.2% retention for 10,000 cycles was obtained in the MSC. Meanwhile, the MSC shows excellent flexibility, maintaining most capacitance under bending conditions. Moreover, using an integrated strategy, MSCs can obtain tunable voltages and currents that meet various practical requirements. All these results indicate that the MPM is an excellent charge storage material and will become a potential candidate for flexible energy-storage devices.

Hierarchical Co2P/CoS2@C@MoS2 Composites with Hollow Cavity and Multiple Phases Toward Wideband Electromagnetic Wave Absorption

“…These multiple hetero‐interfaces could induce uneven charges and defects, then improve polarization loss and electromagnetic wave absorption performance. [ 43 ] Moreover, the average size of Co and Co 2 P particles is calculated to be ≈30.2 nm and 18.6 nm by using the Scherrer formula, which are consistent with the results of HRTEM images.…”

“…These multiple hetero-interfaces could induce uneven charges and defects, then improve polarization loss and electromagnetic wave absorption performance. [43] Moreover, the average size of Co and Co 2 P particles is calculated to be ≈30. S4, Supporting Information) and hollow Co 2 P@C (Figure S5, Supporting Information).…”

CNTs-Supercapacitors: A Review of Electrode Nanocomposites Based on CNTs, Graphene, Metals, and Polymers

“…[98]. The micro-supercapacitors with CNT/PANI/MXene electrodes showed the SC of 414 F/g and cycling stability of 90.4% after 10,000 cycles [99]. Electrode material based on the PANI composite is ideal for flexible supercapacitors.…”

Recent advances in MXene-based nanocomposites for supercapacitors

“…Carbon nanomaterials, such as graphene and carbon nanotubes (CNTs), are commonly complexed with MXene as spacers between MXene nanosheets [125]. The fabrication of MXene-carbon-based nanocomposites is extensively investigated using as electrode for supercapacitors, which can effectively suppress the degradation of electrochemical performance caused by self-stacking of MXene nanosheets [126][127][128][129][130][131][132][133]. Introducing carbon nanomaterials into MXene nanocomposites has the advantages of improving the flexibility, conductivity and electrochemical performance of MXene materials.…”