Performance Improvement of Supercapacitor Materials with Crushed 3D Structured Graphene

Abstract

Conventional 2D-graphene sheets (2D-rGO) often demonstrate poor performance as capacitor materials, especially in cyclability due to the lamellar stacking and agglomeration of the electrode materials. Herein, we have proposed that crushed 3D-graphene (c-3D-rGO) can overcome the limitation. A simplistic way to prepare 3D-crushed graphene structures has been presented utilizing metal rGO core-shell (Ni@rGO) followed by acid leaching. The electrochemical performances of the prepared c-3D-rGO were evaluated as capacitor material using a three-electrode system with aqueous 0.5 M Na2SO4 solution through cyclic voltammetry and galvanostatic charge-discharge measurements. 2D-rGO was separately prepared to compare the performance with 3D-crushed graphene structures. It has been observed that the calculated specific capacitance (Csp) value of the prepared c-3D-rGO was 335 Fg-1 at a current density of 0.15 Ag-1, which was about three times higher than that of the 2D-rGO. The c-3D-rGO electrode retained 100% capacitance of its initial value after 10000 cycles, demonstrating the material’s excellent electrochemical stability. Furthermore, to show the performance in hybrid capacitor, manganese oxide (MnOx) with c-3D-rGO. The presence of c-3D-rGO significantly improved the capacitive performance MnOx.

Polyoxometalate Archetype-Boosted Stability and Charge Storage of 2D Graphene Nanosheets

“…91 The transformation of 2D to a crushed 3D structure of graphene has been found to exhibit stable charging-discharging cycles. 34 Here, by considering the observations related to the characterization of the materials studied, the building of the molecular level architecture of rGP material is illustrated in Fig. 7.…”

“…5d) as obtained by transforming 2D graphene to crushed 3D graphene structure. 34 Conclusions POM, e.g., PTA can be impregnated in the rGO nano-sheets prepared from graphite powder by a simple precipitation method. Understanding of the impregnation of PTA derived from tungstic acid into exfoliated rGO nano-sheets was achieved from FTIR, SEM, EDS, XRD, and UV-visible reflectance results.…”

“…Impregnation of MnO 2 in the graphene sheets enhanced C sp to be doubled. 34 Polyoxometalate (POMs) are well-established metal oxides of transition metals being nanoclusters in all dimensions with fascinating exchangeable structures and a wide range of properties. 35,36 Their intriguing properties, such as robustness, acid tolerance, molecular level conductivity, multi-steps reversible electron transfer behavior, favorable chemical processability, and outstanding redox mechanism, etc.…”

Carbon Nanosheets‐Based Supercapacitor Materials: Recent Advances and Prospects

“…In contrast, the GO/MnO 2 composite has demonstrated an ideal capacitive behavior at a faster rate of charge‐discharge capabilities. This composite outperforms pristine CNS by a significant margin [85,86] …”

Electrode wettability and capacitance of electrical double layer capacitor: a classical density functional theory study

“…Therefore, understanding the behavior of C d as a function of various system parameters is of significant practical interest. To study the C d behavior, Experimental, [52,[61][62][63][64] computational, [26,46,[65][66][67][68][69] and theoretical methods [30,44,51,[70][71][72][73][74][75][76][77][78] have been utilized in the field.…”