Enhancing the supercapacitor performance of flexible MXene /carbon cloth electrodes by oxygen plasma and chemistry modification

Abstract

All-solid-state flexible supercapacitors (FSCs) are promising energy-storage devices in wearable smart electronics. Carbon cloth (CC) has emerged as an ideal candidate as it can fulfill all the required properties for conductive, corrosion-resistant, and lightweight FSC substrates. However, commercial CC is difficult to adhere to without crosslinkers and binders owing to the hydrophobic surface. Herein, oxygen plasma and chemistry methods are selected for hydrophilic modification of commercial CC. Then, Ti 3 C 2 T x flakes are coated on the surface of modified CC as active materials. These modified morphologies were characterized by scanning electron microscope and mechanical properties were investigated by a fabric tensile tester. The electrochemical properties of the MXene-based electrodes by two modification methods were compared. Chemistry modification CC/Ti 3 C 2 T x electrode exhibits an areal capacitance of 513 mF cm −2 , which is 88% higher than that of oxygen plasmamodified CC/MXene electrode, and capacitance retention remains above 92% after 10 000 cycles. This work proposes a feasible strategy, offering a platform for rational designs of flexible electronics based on textiles, as well as employing a large family of MXenes and their heterostructures.

Device-Scaled Controlled Crumpling of MXene-Based Ultrathin Supercapacitors as Stretchable Power Sources

“…Such a phenomenon can also be observed in other flexible supercapacitors with Ti 3 C 2 T x electrodes and a PVA-based polymer gel electrolyte. 63,64 The capacitance retention was retained at 97% after 5000 cycles and 76% after 10000 cycles, which is comparable to that of a Ti 3 C 2 T x -based flexible supercapacitor. 60,65 A sharp decrease between 8000 and 10 000 cycles may be ascribed to the delamination between the gold foil current collector and the Ti 3 C 2 T x electrodes, which was caused by the dehydrationinduced shrinkage of the polymer electrolyte layer during the long-term running.…”

Self-Supporting, Binder-Free, and Flexible Ti3C2Tx MXene-Based Supercapacitor Electrode with Improved Electrochemical Performance

“…It is also noticed that, compared with the pristine MXene, the P-MXene/C polymer -A electrodes exhibit decreases in the peak at ∼3420 cm –1 that is assigned to the −OH stretching vibration, indicating the reduction of −OH group in the P-MXene/C polymer -A. The −OH group on the MXene surface is normally considered to have little contribution to the pseudocapacitance, , and some theoretical studies have reported that the larger −OH group on the MXene surface may pose a barrier to the ion transfer process and be undesirable for ion storage. , The reduction in the −OH of the P-MXene/C polymer -A electrodes could be conducive to the enhancement of their capacitances.…”

Recent progress in energy, environment, and electronic applications of MXene nanomaterials

“…122 Recently, carbon cloth (CC) was modified using MXene without crosslinkers and binders. 123 This CC/ Ti 3 C 2 T x electrode, when used as a flexible SC, under different bending angles, pursued CV curves only with slight changes. These results suggested that the CC/Ti 3 C 2 T x electrode can fulfill the demand for wearable energy storage devices.…”

“…These results suggested that the CC/Ti 3 C 2 T x electrode can fulfill the demand for wearable energy storage devices. 123 For on-chip and wearable electronics, micro-supercapacitors (MSCs) are of great interest. 124 Using Ti 3 C 2 T x and reduced graphene oxide (rGO), Couly et al fabricated an asymmetric flexible MSC.…”