Laser-Induced Fabrication of Electrodes on Graphene Oxide–MXene Composites for Planar Supercapacitors

Abstract

Graphene-based supercapacitors are powerful devices for supporting smart wearable electronics. However, the properties of the as-prepared graphene and its analogues differ from the expected characteristics, which hinder the development of graphene-based energy storage devices. Herein, we demonstrated the fabrication of planar supercapacitors based on laser-induced electrostatic self-assembled graphene oxide−MXene (GO−M) composites. Owing to the synergetic effect of the laser−matter interaction and electrostatic self-assembly, the as-prepared reduced GO−M (R-GO−M) showed good conductivity and a better layered micro-/nanostructure than reduced graphene oxide (RGO). Moreover, in this laser-induced process, MXene was introduced in R-GO−M, which offered more active sites. Therefore, the supercapacitor based on R-GO−M exhibited noticeable capacity enhancement, five times more than the value of the RGO-based supercapacitor. Furthermore, after comprehensive electrochemical performance analysis, the proper electrostatic self-assembly ratio was confirmed to be 10:1. We believe that the laser fabrication technique combined with a simple electrostatic self-assembly mechanism will promote the development of graphenebased energy storage devices using a simple but effective method.

Laser Processing of Emerging Nanomaterials for Optoelectronics and Photocatalysis

“…[220] Mentioning laser patterning of GO, in recent works, MXenes have often been combined with graphene-based materials for SCs. [221,222] Laser scribing of MXenes/graphene has proven to be useful not only for energy-related applications but also for sensors, ranging from simple pressure sensors to more complex wearable platforms. For instance, Zhao et al [175] reported a pressure sensor fabricated by patterning a MXene/GO film on a flexible polydimethylsiloxane (PDMS) substrate using a CO 2 laser.…”

Porous Electrospun Carbon Nanofibers Bearing TiO2 Hollow Nanospheres for Supercapacitor Electrodes

“…Among various TMOs (MnO 2 , 13 NiO, 14 MoO 3 15 ), TiO 2 emerges as an attractive material for this purpose due to its cost-effectiveness, abundance, efficient charge transport pathways, high chemical stability, nontoxic nature, and environmental friendliness. 16 In this paper, we report a facile process for fabricating the porous carbon nanofibers bearing as-prepared TiO 2 hollow nanospheres (hTiO 2 ) electrodes using electrospinning followed by heat treatment for the first time. This process can increase the porosity and surface area of CNFs through the uniform distribution of hTiO 2 , which ultimately improves the specific capacitance of supercapacitor electrodes.…”