A Review of Graphene‐Based Electrochemical Microsupercapacitors

Abstract

The rapid development of miniaturized electronic devices has led to a growing need for rechargeable micropower sources with high performance. Among different sources, electrochemical microcapacitors or microsupercapacitors provide higher power density than their counterparts and are gaining increased interest from the research and engineering communities. To date, little work has appeared on the integration of microsupercapacitors onto a chip or flexible substrates. This review provides an overview of research on microsupercapacitors, with particular emphasis on state‐of‐the‐art graphene‐based electrodes and solid‐state devices on both flexible and rigid substrates. The advantages, disadvantages, and performance of graphene‐based microsupercapacitors are summarized and new trends in materials, fabrication and packaging are identified.

Synthesis of Porous Ni–Co–Mn Oxide Nanoneedles and the Temperature Dependence of Their Pseudocapacitive Behavior

“…Pt mesh and standard calomel electrode (SCE) were used as the counter electrode and reference electrode, respectively. Electrochemical impedance spectroscopy (EIS) measurements were carried out with an amplitude of 5 mV in the frequency ranging from 1 MHz to 0.1 Hz at 0 V. The specific capacitance of the electrodes is calculated from the charge/discharge curves based on Simon and Gogotsi (2008) and Xiong et al (2014b):…”

“…Among these energy storage systems, supercapacitors have attracted extensive attention because of their higher power density than batteries, higher energy density than conventional electrolytic capacitors, and other advantages, such as long cycle life (Simon and Gogotsi, 2008;Xiong et al, 2014b). Designing new electrode materials with high surface area and electrical conductivity is crucial to enhance the energy and power densities of supercapacitors, and pseudocapacitive materials, such as transitional metal oxides, can significantly improve the energy densities compared to carbon-based electrode materials (Simon and Gogotsi, 2008;Huang et al, 2012;Xiong et al, 2013Xiong et al, , 2014a.…”

A cellulose-based hybrid 2D material aerogel for a flexible all-solid-state supercapacitor with high specific capacitance

“…Graphene-based porous carbon materials have been studied in the past for applications in exible electrochemical energy storage devices because of their many excellent properties such as high specic surface area (2675 m 2 g À1 ), strong mechanical behaviour, and rapid thermal and electrical conductivity; however, their capacity is relatively low. [10][11][12][13][14][15] MoS 2 sheets, a kind of layered 2D materials obtained from transition metal dichalcogenides (TMDs), which have similarities with graphene, have been studied to a lesser extent; however, they have attracted increasing interest in recent years for integration into energy storage devices because they can provide a high specic surface area for charge storage of an electric double layer. 16,17 But their applications alone in supercapacitors are still very limited because of their low specic capacitance, which is probably related to the low conductivity of the MoS 2 molybdenite phase.…”

All-solid-state supercapacitors on silicon using graphene from silicon carbide

“…[13][14][15] Graphene has been intensively investigated for various energy storage devices, [16][17][18] but the use of graphene in the all-solid-state supercapacitors has not been investigated sufficiently, [19][20][21][22][23][24] due to limitations in the availability of a large-scale high-quality graphene on the one hand, and to the difficulties related to the transfer of graphene powders to the substrate/device location, which results in cumbersome fabrication as well as poor reliability on the other hand. These challenges have urged the search for more reliable fabrication methods to obtain graphene on the substrate without further handling, e.g., transfer-free graphene on silicon substrates.…”