Flexible and Stackable Laser-Induced Graphene Supercapacitors

Abstract

In this paper, we demonstrate that by simple laser induction, commercial polyimide films can be readily transformed into porous graphene for the fabrication of flexible, solid-state supercapacitors. Two different solid-state electrolyte supercapacitors are described, namely vertically stacked graphene supercapacitors and in-plane graphene microsupercapacitors, each with enhanced electrochemical performance, cyclability, and flexibility. Devices with a solid-state polymeric electrolyte exhibit areal capacitance of >9 mF/cm2 at a current density of 0.02 mA/cm2, more than twice that of conventional aqueous electrolytes. Moreover, laser induction on both sides of polyimide sheets enables the fabrication of vertically stacked supercapacitors to multiply its electrochemical performance while preserving device flexibility.

Flexible, Stretchable, and Transparent Planar Microsupercapacitors Based on 3D Porous Laser‐Induced Graphene

“…Recently, an inexpensive laser-inducing technique at room temperature has been applied to prepare graphene on polyimide (PI) substrate, and the resulting laser-induced graphene (LIG) has been demonstrated to be a ready electrode material for supercapacitors due to its 3D porous multilayer structure. [30][31][32] This work introduces 3D LIG directly from polyimide to prepare all-solid-state, highly stretchable, and transparent MSCs, using as the active material on silicone rubber substrates. The 3D network of LIG with interdigital microelectrode structure is obtained by using laser-inducing method on PI substrate.…”

On-chip and freestanding elastic carbon films for micro-supercapacitors

“…A large variety of materials such as graphene (3)(4)(5), nanotubes (6, 7), carbide-derived carbons (CDC) (8,9), and pseudocapacitive materials (1,10,11) have been explored in micro-supercapacitors in the past 5 years. Much of the recent work focused on the use of wet processing routes (using colloidal solutions or suspensions of particles for the electrode preparation) for the development of flexible micro-devices for printable electronics (1,4,5,12). However, the wet processing methods are not fully compatible with semiconductor device manufacturing used in the electronics industry, thus hampering supercapacitor manufacturing on silicon chips.…”

Graphene for Biomedical Applications: A Review

“…It was also proven that, laser induction on both sides of polyimide films multiplies electrical performance of vertically stacked supercapacitors while preserving its device flexibility. This study highlights the capability of solidstate polymeric electrolyte-based devices in exhibiting areal capacitance of more than 9 mF/cm 2 at a current density of 0.02 mA/cm 2 , which is over twice that of conventional aqueous electrolytes (Peng et al 2015). Abidin et al (2015) demonstrated that interdigital electrodes achieved maximum current response which is 5.5 A/m compared to planar electrodes which only exhibits 0.025 A/m.…”

“…This eventually prevents graphene sheets from stacking on each other due to Van der Waals force during drying process; and acts as a binder to holds graphene sheets together. In recent studies, Wang Peng et al (2015) demonstrated the use of laser induction technology to produce laser-induced graphene from polyimide films for the fabrication of 3-D supercapacitors, namely vertically stacked graphene supercapacitors and in-plane graphene microsupercapacitors. The stacked configuration of graphene increases the energy densities of the device which leads to superconductivity.…”

“…Lu et al (2009) introduced a novel method to overcome this hurdle (Peng et al 2015). In contrast, graphene based biosensors demonstrates ultrahigh sensitivity compared to 1-D CNTs.…”