A Novel Sandwiched Porous MXene/Polyaniline Nanofibers Composite Film for High Capacitance Supercapacitor Electrode

Abstract

As a class of promising 2D material, MXenes are widely applied to energy storage systems (ESSs) due to metallic conductivity and high electrochemical activities, but the restacking problem during electrode preparation restricts their electrochemical performances. Herein, polyaniline nanofibers (PANINFs) are used as conductive interlayer spacers to induce the self‐assembly of MXene (Ti3C2Tx)‐based electrode. The favored sandwiched porous structure is formed due to the electrostatic adsorption and hydrogen bond interaction between the positively charged PANINFs and the negatively charged Ti3C2Tx nanosheets, which provide abundant accessible sites and facilitate the diffusion of ions. As a result, the flexible freestanding Ti3C2Tx/PANINFs composite electrode exhibits high conductivity (1373.3 S cm–1) and excellent gravimetric capacitance of 645.7 F g–1. Due to the enhanced structural stability, it achieves impressive cycling stability of 98% capacitance retention after 5000 cycles, which is significantly improved from that of pristine Ti3C2Tx electrode (84.6%). This work provides a feasible strategy for the structure regulation and performance enhancement of MXene‐based supercapacitors, which has great potential in energy storage systems.

Interfacial Self-assembly of Organics/MXene Hybrid Cathodes Toward High-Rate-Performance Sodium Ion Batteries

“…But, most of the reported MXenes-organic composites are designed to enhance the ions-storage capacity or pseudocapacitance of MXenes themselves. , Considering that most of organic materials, such as the widely investigated carbonyl electrode materials, are rich in functional groups and could interact with −F, −O, −OH or others. Hence, it could be envisioned that the interaction of functional groups between Ti 3 C 2 T x MXene and organic materials could induce the polymerization assembly of organic materials on the surface of 2D MXene to form uniform organic–inorganic hybrids. − In this study, as a proof-of-concept, polyanthraquinone sulfide (PAQS) was selected to be in situ assembled on the surface of Ti 3 C 2 T x MXene to form the PAQS@MXene hybrid materials. The assembled Ti 3 C 2 T x in the hybrids is able to serve as the electron and ionic transport pathway for fast charge and ions transfer.…”

Role of MXenes/Polyaniline Nanocomposites in Fabricating Innovative Supercapacitor Technology

“…Accordingly. the flexible binder-free nanocomposite electrode displayed high conductivity (1373.3 S.cm -1 ) much improved electrochemical performance compared to that of the pristine Ti 3 C 2 T X electrode [83].…”

Recent Advances in MXene/Polyaniline-Based Composites for Electrochemical Devices and Electromagnetic Interference Shielding Applications

“…For example, Yin et al developed a multifunctional MXene/PANI composite textile by a combination of 1D PANI nanowires and 2D MXene nanosheets onto a carbon fiber fabric substrate based on the layer-by-layer assembly method (see Figure ). Moreover, self-assembly and in situ assembly methods are also used in the fabrication of MXene/PANI-based composites. ,,, Wang et al took solvent-assisted self-assembly and a redispersion strategy to prepare PANI/MXene inks and then obtained PANI/MXene composite films via an evaporation-induced assembly process . Chen et al used dl -tartaric acid assembled on the surface of MXene to achieve supramolecular self-assembly and then obtained a PANI/MXene composite using the electronegative oxygen groups that can induce the polymerization of PANI…”