Supercapacitors based on nanostructured carbon

Li, Xin; Wei, Bingqing

doi:10.1016/j.nanoen.2012.09.008

Cited by 523 publications

(244 citation statements)

References 103 publications

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“…While activated carbon is the material of choice for commercial supercapacitors, other forms of carbon materials such as carbide-derived carbons (CDCs) [10], onion-like carbons (OLCs) [11], carbon nanotubes (CNTs) [12] and graphene [13] are currently being considered as next generation EDLC electrodes. In general, the electrochemical performance of carbon based EDLC device is highly dependent on its SSA, pore size and pore size distribution (PSD) [14]. Therefore, it is necessary to control these parameters during the production of the carbon materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of porous carbon from expanded graphite for high energy density supercapacitor in aqueous electrolyte

Barzegar

Bello

Momodu

et al. 2016

Journal of Power Sources

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In this work, we present the synthesis of low cost carbon nanosheets derived from expanded graphite dispersed in Polyvinylpyrrolidone, subsequently activated in KOH and finally .This electrical double layer capacitor electrode also exhibits excellent stability after floating test for 120 h in 6 M KOH aqueous electrolyte. These results suggest that this activated expanded graphite (AEG) material has great potential for high performance electrode in energy storage applications.

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Section: Introductionmentioning

confidence: 99%

Preparation and characterization of porous carbon from expanded graphite for high energy density supercapacitor in aqueous electrolyte

Barzegar

Bello

Momodu

et al. 2016

Journal of Power Sources

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“…High scan rates cause higher noise levels and less accurate results due to the fact that fast scan rates causes graphene sheets agglomeration which is unwanted as it reduces the obtained surface area. Moreover, the anodic peaks shift positively while the cathodic peaks shift negatively for the electrode's internal resistance (Lia and Weia, 2013). The shape of curves is not affected much at a scan rate less than 20 mV s −1 , indicating the good stability rate of the electrode material.…”

Section: Characterization Of Synthesized Samplesmentioning

confidence: 91%

“…From another prospective supercapacitors exists and have attracted a lot of attention lately, as it serves as power sources that have many appealing properties such as rapid charging/discharging rate, long lifetime and energy density of several orders of magnitude higher than that of conventional dielectric capacitors, yet there was a tradeoff between either high energy density or high power density. This problem was proposed to be overcome by implementing graphene in the supercapacitors electrode material (Lia and Weia, 2013;Wang et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Graphene on Conducting Substrate by Electrochemical Deposition Method

Moghazi¹,

Shareef²,

Wong³

et al. 2017

American Journal of Applied Sciences

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Investigation to optimize the synthesis process of graphene on conducting substrate is essential for many applications. In this investigation suitable approach to extract graphene thin film on a conductive ITO substrate is optimized. This optimization is carried out by electrochemical Reduction of Graphene Oxide (RGO) solution utilizing a repetitive cyclic potential against reference electrode. To do this, Silver chloride reference electrode is employed within a three electrode system at a potential range of (0 to -1.5) V. A number of four consecutive cycles is used to obtain a negative reduction peak. Yet more importantly the material's electrochemical properties were studied by Cyclic Voltammetry (CV) operation. From CV, it is clear that, the surface area with electrodeposition from ITO to RGO/ITO and RGO/RGO/ITO rates in a potential window of (2V) for (-1 to 1) V is improved. Moreover, Electrochemical Impedance Spectroscopy (EIS) showed reduced electrode surface internal resistance of the modified electrode that dramatic decreased in comparison from 96.33kΩ of RGO/ITO to 32Ω of RGO/RGO/ITO. In addition, Charge/Discharge Cycle (CDC) is obtained that showed relatively symmetrical charging property along with its corresponding discharge equivalents viewing rapid charging/discharging process that favors redox process for increased mobility and thus conductivity improvement. Moreover the modified electrode was studied for its physical characteristics using Scanning Electron Microscopy (SEM) that showed uniform reduced graphene sheets deposition with particles diameter ranging from 1.65µm to 635nm. Atomic Force Microscopy (AFM) was used in contact mode for a square area of 5µm showing increased surface roughness from ITO of 2.773nm in comparison to Reduced Graphene Oxide/RGO/ITO 34.93nm. Results also proved that deposition of multiple layers of Graphene could strongly improve energy storage applications if implemented by allowing the material to hold greater charge in smaller area. This will lead to enhance the power densities far beyond existing electrochemical capacitors in a cost effective eco-friendly manner.

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“…[54][55][56][57][58] Nevertheless, repeated swelling/shrinking during charging/discharging process is apt to cause their structural change, leading to unsatisfactory cyclic stability. [59][60][61] Up to now, three effective strategies have been explored to improve their electrochemical performance and cyclic stability: i) nanostructuring, ii) hybridization with carbon nanomaterials, and iii) hybridization with pseudo-capacitive transition metal oxides. Below, we provide a detailed introduction on the latest research advances for these three strategies.…”

Section: Conducting-polymer-based Materials For Supercapacitorsmentioning

confidence: 99%

Conducting‐Polymer‐Based Materials for Electrochemical Energy Conversion and Storage

Wang

Kong

et al. 2017

Advanced Materials

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and poly(3,4-ethylenedioxythiophene) (PEDOT). The highly conjugated polymer chains can be reversibly assigned electrochemical properties by a doping/dedoping process. [9][10][11] By regulating and controlling the level of doping, their conductivities can be tuned in a wide range, from 10 −10 to 10 4 S cm, spanning the entire range from insulators to semiconductors, to conductors. [12,13] Additionally, these conducting polymers retain the advantages of traditional polymers, such as low cost, convenient preparation, good affinity to many other materials, and high flexibility and durability. Recently, great efforts have been made to exploit the applications of conducting polymers as electrocatalysts for fuel cells and as electrode materials for supercapacitors. Considering the rapidly booming efforts undertaken in this cutting-edge research area, it is necessary to highlight the new discoveries and achievements in the past several years. Here, we introduce the latest advances in conducting-polymer-based materials for fuel cells and supercapacitors, and focus on the strategies employed to improve their electrocatalytic and electrochemical performance. Conducting-Polymer-Based Catalysts for Fuel CellsFuel cells are promising green energy-conversion devices that convert chemical energy of various fuels directly into electric energy under electrochemical redox reactions. This technology provides intriguing applications in portable energy sources [14,15] and has attracted increasing attention in recent years. [16][17][18][19] Such energy-conversion systems require highly efficient electrocatalysts to trigger the oxygen reduction reaction (ORR) that occurs at the fuel cell's cathode. Platinum/ carbon (Pt/C) composite is demonstrated to be the most efficient catalyst used for fuel cells. [20][21][22] However, high price, scarcity, poor utilization efficiency, and easy carbon monoxide poisoning greatly limit its commercial applications. [23] Therefore, development of low-cost, stable, and efficient electrocatalysts for ORR is a major challenge in the field of fuel cells. [24][25][26][27][28] Owing to their highly tunable conductivity, good electrocatalytic activity, and satisfactory electrochemical stability, conducting polymers are considered to be promising electrocatalyst materials for the ORR. [29] Initially, conducting-polymer-based electrodes were fabricated through direct casting of neutral To alleviate the current energy crisis and environmental pollution, sustainable and ecofriendly energy conversion and storage systems are urgently needed. Due to their high conductivity, promising catalytic activity, and excellent electrochemical properties, conducting polymers have been attracting intense attention for use in electrochemical energy conversion and storage. Here, the latest advances regarding the utilization of conducting polymers for fuel cells and supercapacitors are introduced. The strategies employed to improve the electrocatalytic and electrochemical performances of conducting-polymerbased materials are prese...

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Supercapacitors based on nanostructured carbon

Cited by 523 publications

References 103 publications

Preparation and characterization of porous carbon from expanded graphite for high energy density supercapacitor in aqueous electrolyte

Preparation and characterization of porous carbon from expanded graphite for high energy density supercapacitor in aqueous electrolyte

Synthesis of Graphene on Conducting Substrate by Electrochemical Deposition Method

Conducting‐Polymer‐Based Materials for Electrochemical Energy Conversion and Storage

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