The implementation of graphene-based aerogel in the field of supercapacitor

Abstract

Graphene and graphene-based hybrid materials have emerged as an outstanding supercapacitor electrode material primarily because of their excellent surface area, high electrical conductivity, and improved thermal, mechanical, electrochemical cycling stabilities. Graphene alone exhibits electric double layer capacitance (EDLC) with low energy density and high power density. The use of aerogels in a supercapacitor is a pragmatic approach due to its extraordinary properties like ultra-lightweight, high porosity and specific surface area. The aerogels encompass a high volume of pores which leads to easy soak by the electrolyte and fast charge-discharge process. Graphene aerogels assembled into three-dimensional (3D) architecture prevent there stacking of graphene sheets and maintain the high surface area and hence excellent cycling stability and rate capacitance. However, the energy density of graphene aerogels is limited due to EDLC type of charge storage mechanism. Consequently, 3D graphene aerogel coupled with pseudocapacitive materials such as transition metal oxides, metal hydroxides, conducting polymers, nitrides, chalcogenides show an efficient energy density and power density performance due to the presence of both types of charge storage mechanisms. This laconic review focuses on the design and development of graphene-based aerogel in the field of the supercapacitor. This review is an erudite article about methods, technology and electrochemical properties of graphene aerogel.

Recent Advancements in Energy Storage Based on Sodium Ion and Zinc Ion Hybrid Supercapacitors

“…The 2D carbon has good physiochemical stability due to the high interconnected area formed by randomly overlapped 2D building blocks. 122 However, 2D layered carbons usually result in ineffective charge storage due to the restacking and agglomeration of nanosheets. One efficient way to resolve this problem is to insert foreign atoms into the carbon structure.…”

“…The added heteroatoms provide more active sites which enhance the charge storage capability. 122 Lu et al reported a new type of carbon material: 2D layered B/N codoped porous carbon (LDC). The LDC was synthesized by a facile intercalator (H 3 BO 3 )-guided pyrolysis technique by using acrylonitrile copolymer as the carbon source.…”

“…These 2D carbons have large interlayer spacing which provides a high surface area, substantial exposed electroactive sites, and increasing capacitive behavior. The 2D carbon has good physiochemical stability due to the high interconnected area formed by randomly overlapped 2D building blocks . However, 2D layered carbons usually result in ineffective charge storage due to the restacking and agglomeration of nanosheets.…”

Microstructure analysis, tribological correlation properties and strengthening mechanism of graphene reinforced aluminum matrix composites

“…However, graphene has some limitations in its applications. Graphene has a large specific surface area of up to 2630 cm 2 /g 8 , which makes graphene easily agglomerate. If graphene is not uniformly distributed in the matrix, it will have an adverse impact on the properties of the material.…”

Fabrication of PDMS/GA Composite Materials by Pickering Emulsion Method and Its Application for Oil-Water Separation

“…GO has abundant oxygen-containing functional groups [15,16], which allows it to be active in many reactions. The material synthesized as a raw material has high porosity [17,18], low density [19,20], and low thermal conductivity [21,22], which has attracted widespread attention.…”