Nanoarchitectured Graphene‐Based Supercapacitors for Next‐Generation Energy‐Storage Applications

Abstract

Tremendous development in the field of portable electronics and hybrid electric vehicles has led to urgent and increasing demand in the field of high-energy storage devices. In recent years, many research efforts have been made for the development of more efficient energy-storage devices such as supercapacitors, batteries, and fuel cells. In particular, supercapacitors have great potential to meet the demands of both high energy density and power density in many advanced technologies. For the last half decade, graphene has attracted intense research interest for electrical double-layer capacitor (EDLC) applications. The unique electronic, thermal, mechanical, and chemical characteristics of graphene, along with the intrinsic benefits of a carbon material, make it a promising candidate for supercapacitor applications. This Review focuses on recent research developments in graphene-based supercapacitors, including doped graphene, activated graphene, graphene/metal oxide composites, graphene/polymer composites, and graphene-based asymmetric supercapacitors. The challenges and prospects of graphene-based supercapacitors are also discussed.

Orange-Peel-Derived Carbon: Designing Sustainable and High-Performance Supercapacitor Electrodes

“…Table 2 displays the capacitive performance of the recently synthesized activated carbon from the biomass precursors. It should be noted that the charge storage capacity of OPAC-1 was higher than commercially available activated carbons (<200 F/g) [55], and even comparable to the more advanced forms of carbons such as graphene-based materials (100-347 F/g) [56], nitrogen-doped graphene (138-326 F/g) [57], and CNT (128-335 F/g) [58]. The high capacitive performance of our material can be attributed to the higher specific surface area along with the prominent mesopore structure, with a 3-4 nm pore size.…”

Graphene-Based Supercapacitors Using Eutectic Ionic Liquid Mixture Electrolyte

“…As a result, intensive research efforts have been made to characterize graphene and graphene-based materials in supercapacitors applications [1,[3][4][5]. Specific capacitance beyond 200 F.g À1 has been achieved in both aqueous and organic electrolytes [4,[6][7][8][9], which is similar or even better to many carbon materials like porous activated carbon [10]. However, the low density of graphene often comes with a low volumetric capacitance (F. cm…”

Ternary Ni–Cu–OH and Ni–Co–OH electrodes for electrochemical energy storage

“…Reduced graphene oxide (rGO) nanosheets have been also utilized for electrochemical supercapacitors with much better cycling stability than that of metal oxide and hydroxide electrodes [3]. One of the best results for reduced graphene oxide supercapacitors was reported by Bai et al [22] using a modified Hummer's method and hydrothermal reduction, and obtaining a full-cell specific capacitance of 230 F/g at 1 A/g and a capacitance retention of *89 % after 10,000 cycles.…”

“…Due to the differences in these energy storage mechanisms, Faradic capacitors fundamentally exhibit higher capacitance but weaker charge-discharge cycling stability than those of ELDC. Porous materials with electrical conductivity have been earlier investigated for both fundamental understanding and practical implementations in EDLC [3,4]. For Faradic capacitors and rechargeable batteries, transition metal oxides/hydroxides and intrinsically conductive polymers have been intensively reported in the literature [5][6][7][8][9].…”