High performance asymmetric supercapacitor based on Cobalt Nickle Iron-layered double hydroxide/carbon nanofibres and activated carbon

Abstract

A novel Cobalt Nickle Iron-layered double hydroxide/carbon nanofibres (CoNiFe-LDH/CNFs-0.5) composite was successfully fabricated through an easy in situ growth approach. The morphology and composition of the obtained materials were systematically investigated. When the two derived materials were used for supercapacitor electrodes, the CoNiFe-LDH/CNFs-0.5 composite displayed high specific surface area (114.2 m2 g−1), specific capacitance (1203 F g−1 at 1 A g−1) and rate capability (77.1% from 1 A g−1 to 10 A g−1), which were considerably higher than those of pure CoNiFe-LDH. Moreover, the specific capacitance of CoNiFe-LDH/CNFs-0.5 composite remained at 94.4% after 1000 cycles at 20 A g−1, suggesting excellent long-time cycle life. The asymmetric supercapacitor based on CoNiFe-LDH/CNFs-0.5 as a positive electrode and activated carbon as a negative electrode was manufactured and it exhibited a specific capacitance of 84.9 F g−1 at 1 A g−1 and a high energy density of 30.2 W h kg−1. More importantly, this device showed long-term cycling stability, with 82.7% capacity retention after 2000 cycles at 10 A g−1. Thus, this composite with outstanding electrochemical performance could be a promising electrode material for supercapacitors.

Fabrication of Solid-State Asymmetric Supercapacitors Based on Aniline Oligomers and Graphene Electrodes with Enhanced Electrochemical Performances

“…The symmetrical shape of the charge and discharge curves for each sample indicates that the charge and discharge currents are stabilized. 3,26 ASCs with tetramers showed longer discharge time at every current. The results indicate that the tetramers have better capacitive behavior compared to the trimers and dimers.…”

High performance hybrid supercapacitor device based on cobalt manganese layered double hydroxide and activated carbon derived from cork (Quercus Suber)

“…Several types of EDLC materials have been utilized as SCs material electrodes. These includes carbide-derived carbons, graphene, carbon-nanofibers, zeolite-templated carbon, carbon nanotubes (CNTs) and activated carbon [10][11][12][13][14][15][16][17][18][19][20][21][22]. Amongst these materials, the most commonly used in hybrid devices is activated carbon due to its high specific surface area (SSA), ease of production, light weight, relatively low cost, good porosity and presence of pseudocapacitive charge transfer mechanism which can contribute to increased specific capacitance due to the presence of functional groups [3,8,[23][24][25].…”

Current Research of Graphene-Based Nanocomposites and Their Application for Supercapacitors

“…Nanomaterials 2019, 9, x FOR PEER REVIEW 4 of 50 review, we will focus specifically on these forms of graphene and its analogue-based nanocomposites consisting of oxides/sulfide, and provide a timely update about their performance as electrode materials in SCs. Firstly, we introduce some preliminary background information of SC to the beginners, which we hope will ease our review and briefly cover the results of previous literature published on graphene-based SCs, which mainly covered the working principle of SCs, the flexibility of electrodes, new technologies, nitrogen-doped graphene electrodes, conducting polymers, and inorganic hybrids with graphene materials for SCs [8,12,[13][14][15][16][17][18]. Since the performances of an electrode material predominantly depends on factors like high surface area, electrical conductivity, and wetting of electrodes, whilst metal oxides with graphene and its derivatives have all characteristics above, therefore they possess great competence as electrode (high charging, high power density, discharging rate, high coulombic efficiency, and long cycling life) material for SCs.…”

“…Hence, the design and fabrication of efficient electrode materials are of importance for the development of high-performance futuristic energy storage devices. Graphene-based materials with intriguing properties have shown to be a promising building block as electrode materials [16,17], and a wide range of graphene and its 2D analogues in conjunction with different additives, such as conducting polymers, metal oxides, core-shell structures, etc., could offer countless possibilities as electrodes for the construction of energy storage devices of improved performance [18]. It is because of the unique electronic conductivity of GO and its derivatives, which has been explored in detail elsewhere [19].…”