Fabrication of Flexible Graphene Paper/MnO₂ Composite Supercapacitor Electrode through Electrodeposition of MnO₂ Nanoparticles on Graphene Paper

Abstract

The flexible electrodes are the crucial components for fabricating wearable supercapacitors. In this study, we present a quick and convenient method to prepare graphene paper (GP) as a flexible current collector on a large scale by an easy one-step method. The composite electrode integrated with GP and MnO 2 as a flexible supercapacitor was obtained by an electrochemical deposition method without using binder or conductive agent. The substrate (GP) of electrode not only provides mechanical strength, but also contributes energy storage capacity. The MnO 2 nanoparticles deposited on the surface of GP further improved the electrochemical performance of composite. The neat GP can give a specific capacitance of 184 F/g at a current density of 1 A/g. At a current density of 1 A/g, the specific capacitance of the GP/MnO 2 composite with a deposition time of 30 s is as high as 410 F/g. The method presented here shows great potential for the development of flexible electrode materials in practical energy storage devices.

Potential of MnO2‐based composite and numerous morphological for enhancing supercapacitors performance

“…Besides using different KMnO 4 molarities, the mass of MnO 2 can also be controlled through the deposition time when using the electrodeposition method. From Figure 7B, it can be seen that the sample obtained the most optimum results with an electro‐deposition time of 30–50 s. More precisely, the highest performance was obtained by the graphene paper/MnO 2 nanoparticle composite sample with an electrodeposition time of 30 s with a specific capacitance of 410 F/g 204 …”

“…The highest energy density reported was obtained from asymmetric Ppy/GO|Ppy/MnO 2 of 52.3 W h/kg and power density of 1392.9 W/kg. 189 The challenge is that at high current densities, the electrolyte ions must diffuse ions from the outside active surface rather than the interior structure F I G U R E 7 Supercapacitor performance through differences (A) molarity of KMnO 4 , 158,201,202 (B) electrodeposition time, 160,[203][204][205] (C) loading mass, [206][207][208] (D) mass percentage during the synthesis of MnO 2 composite. [209][210][211] of the active material.…”

“…From Figure 7B, it can be seen that the sample obtained the most optimum results with an electro-deposition time of 30-50 s. More precisely, the highest performance was obtained by the graphene paper/MnO 2 nanoparticle composite sample with an electrodeposition time of 30 s with a specific capacitance of 410 F/g. 204 The percentage and loading mass of the amount of material used in the electrode synthesis process also impact the performance of composites, in addition to the type of material used. specific capacitance of 1907 F/g.…”

“…Supercapacitor performance through differences (A) molarity of KMnO 4 , 158,201,202 (B) electrodeposition time, 160,203–205 (C) loading mass, 206–208 (D) mass percentage during the synthesis of MnO 2 composite 209–211 …”

A Flexible Reduced Graphene Oxide‐based Paper for Supercapattery Design: Effect of Polyindole Thin Films and Zinc Oxide Nanoparticles

“…[9,10] Due to the advantages of simple adjustment of paper thickness, easy arrangement of chemical composition, high flexibility, durable structure, and integration to wearable applications, it is noteworthy that more research has been conducted on the production of flexible graphene-based paper electrodes (FGPEs) for various electrochemical applications e. g. supercapacitors, [10] batteries, [11] and electrochemical sensors. [12][13][14] These paper-like electrodes can be created using different methods such as mold casting, [10] vacuum-filtration, [14,15] barcoating, [16] inkjet-printing, [17] and pressing. [18] A new energy-storage idea was put forward in 2009 by Klumpner et al, [19] consisting of a high power density of EDLC on one side and a high energy density of battery-type electrodes on the other side.…”