Facile electrodeposition of reduced graphene oxide hydrogels for high-performance supercapacitors

Phạm, Việt Hùng; Gebre, T.; Dickerson, James H.

doi:10.1039/c4nr07508k

Cited by 45 publications

(29 citation statements)

References 31 publications

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“…20 Briefly, 200 mL of concentrated H 2 SO 4 was charged into a 1000 mL beaker equipped with a mechanical stirrer (Teflon impeller). 20 Briefly, 200 mL of concentrated H 2 SO 4 was charged into a 1000 mL beaker equipped with a mechanical stirrer (Teflon impeller).…”

Section: Experimental Preparation Of Gomentioning

confidence: 99%

Facile synthesis of ultra-small ruthenium oxide nanoparticles anchored on reduced graphene oxide nanosheets for high-performance supercapacitors

2015

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Herein, we report a facile, low cost, and environmentally friendly approach to prepare reduced graphene oxide-ruthenium oxide hybrid (RGO-RuO2) materials for supercapacitor electrode applications by in situ sol-gel deposition of RuO2 nanoparticles on the surface of graphene oxide (GO), followed by a reduction of GO in a strong alkaline medium at a low temperature. The combination of the sol-gel route and the reduction of graphene oxide at low temperature resulted in ultrafine, hydrated amorphous RuO2 particles with the size of only 1.0 -2.0 nm, which uniformly decorated the surfaces of RGO sheets. The obtained RGO-RuO2 supercapacitor exhibited excellent electrochemical capacitive performance in a 1M H2SO4 electrolyte with a specific capacitance more than 500 F/g at a current density of 1.0 A/g and high rate performance with the capacitance retention of 86 % when increasing 20 times the current density, from 1.0 to 20.0 A/g in a twoelectrode test cell configuration. The RGO-RuO2 system also showed good cycling stability with a capacitance retention of 87 % after 2000 cycles. The excellent capacitive properties of RGO-RuO2 could be attributed to the uniform anchoring of ultra-small, hydrated amorphous RuO2 nanoparticles on the surface of RGO sheets, resulting in synergistic effects between them. The developed approach represents an exciting direction for enhancing the device performance of the graphenemetal oxides composites supercapacitors and can be used for designing the next generation of energy storage devices.Please do not adjust margins Please do not adjust margins attempts have been made to combine these two kinds of materials.7-17 However, the capacitive performance of RGO-RuO 2 nanocomposites has varied, ultimately depending on the dispersion morphology and crystallinity of RuO 2 particles on RGO. To obtain high capacitive performance, RuO 2 must be in the form of small sized, hydrated, amorphous nanoparticles, uniformly anchored on the surface of an RGO single sheet. 6

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Section: Experimental Preparation Of Gomentioning

confidence: 99%

Facile synthesis of ultra-small ruthenium oxide nanoparticles anchored on reduced graphene oxide nanosheets for high-performance supercapacitors

2015

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Section: Supercapacitorsmentioning

confidence: 99%

Highly Efficient Materials Assembly Via Electrophoretic Deposition for Electrochemical Energy Conversion and Storage Devices

Wen

Zhang

et al. 2016

Advanced Energy Materials

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and fi lms can be assembled on substrates with this versatile method. Film thickness, particle size and inter structure of EPD fi lms are controllable by adjusting the suspension/process parameters. [ 2,3 ] Energy conversion and storage devices have been developed rapidly in the past few decades, and proposed as the foundation of modern society. Novel carbon materials such as graphene and carbon nanotubes (CNTs) are investigated widely for high-effi ciency rechargeable battery and supercapacitor (SC) applications. [ 4,5 ] Traditional methods such as blade coating and slot die are employed to prepare electrodes to realize such applications. [ 6,7 ] In these methods, active materials are dissolved into a solvent to form a viscous solution, and a fi lm is obtained after coating and solvent evaporation. Nevertheless, neither thickness control nor a high fi lm assembly effi ciency can be realized via these methods. In addition, traditional methods exhibit limitation on the fabrication of nanostructured energy materials due to the aggregation of nanoparticles. On the other hand, methods for micro-batteries such as vapor deposition methods, [ 8 ] radio-frequency sputtering, [ 9 ] and pulsed laser deposition [ 10,11 ] are expensive and diffi cult to scale up. Indeed, a versatile EPD technique with cost-effectiveness, short formation time, and high scalability is promising for efficient fabrication of energy conversion and storage materials and devices. A typical EPD process is performed in two steps, including the dispersion of powder particles in a solvent to form a stable suspension and the deposition of particles on a substrate in the presence of an electric fi eld. [ 12,13 ] Preparation of a stable suspension is essential to the deposition process. The stability of suspension, adjustable with surfactants, is correlated with electrostatic repulsive and van der Waals attractive interactions. The stability of suspension/colloid is characterized by zeta potential, the value of which represents the magnitude of repulsive interaction while the sign represents the migration direction of particles. Zeta potential is mainly determined by temperature, pH, and type of surfactant. On the other hand, the migration velocity of particles in deposition depends on the applied voltage/current, particle size, zeta potential, suspension concentration, and solvent viscosity. [ 14 ] The utilization of EPD in the energy storage/conversion devices fi eld enables the direct deposition of active particles on the current collector.Featuring pronounced controllability, versatility, and scalability, electrophoretic deposition (EPD) has been proposed as an effi cient method for fi lm assembly and electrode/solid electrolyte fabrication in various energy storage/conversion devices including rechargeable batteries, supercapacitors, and fuel cells. High-quality electrodes and solid electrolytes have been prepared through EPD and exhibit advantageous performances in comparison with those realized with traditional methods. Recent advances in the appli...

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“…Conventional carbon material‐based electrode materials which are known as one of energy storage mechanisms of EDLC for supercapacitors have been widely used in the commercial field due to its lower maintenance costs, excellent conductivity and the ideal chemical and mechanical stability . However, the low energy density and specific capacitances whose measured value is about 200 F g −1 hinder its further application in energy storage . Another kinds of electrode materials, such as transition metal oxides, hydroxides and sulfides, which confirm the energy storage mechanisms of pesudocapacitive characteristics, have attracted great attention in recent years owing to their multiple oxidation states at electrochemical reaction, resulting in a higher specific capacitances and energy density .…”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14] However, the low energy density and specific capacitances whose measured value is about 200 F g À1 hinder its further application in energy storage. [15] Another kinds of electrode materials, such as transition metal oxides, hydroxides and sulfides, which confirm the energy storage mechanisms of pesudocapacitive characteristics, have attracted great attention in recent years owing to their multiple oxidation states at electrochemical reaction, resulting in a higher specific capacitances and energy density. [16] Especially metal sulfides, as a new class of electrode materials, have attracted a wide research interests.…”

Section: Introductionmentioning

confidence: 99%

Formation of a Flower‐Like Co−Mo−S on Reduced Graphene Oxide Composite on Nickel Foam with Enhanced Electrochemical Capacitive Properties

et al. 2018

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Transition metal sulfides have attracted considerable attention due to their excellent electrochemical performance for supercapacitors. Herein, we prepared a Co3S4/CoMo2S4 (Co−Mo−S) composite on reduced graphene oxide/Ni foam (RGO/NF) with unique flower‐like morphology through a carefully time‐controlled sulfurization process. It was found that the vulcanization time has a great influence on the morphology and electrochemical properties of the composites. After 3 hours of vulcanization, the as‐prepared Co3S4/CoMo2S4@RGO/NF electrode exhibited a superior specific capacitance of 2530.4 F g−1 at a current density of 1 A g−1, as well as excellent cycling stability with 78.8 % retention of the initial capacitance even after 6,000 cycles at a current density of 10 A g−1. An asymmetric device was assembled employing the Co3S4/CoMo2S4@RGO/NF composite as a positive electrode and activated carbon (AC) as a negative electrode. The device delivered a maximum energy density of 59.0 Wh kg−1 at a power density of 640 W kg−1 and a high cycling performance (90.7 % capacitance retention after 6,000 cycles). These results demonstrate the promising potential of Co−Mo−S@RGO/NF as binder‐free, high‐performance electrode in renewable energy storage systems.

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Facile electrodeposition of reduced graphene oxide hydrogels for high-performance supercapacitors

Cited by 45 publications

References 31 publications

Facile synthesis of ultra-small ruthenium oxide nanoparticles anchored on reduced graphene oxide nanosheets for high-performance supercapacitors

Facile synthesis of ultra-small ruthenium oxide nanoparticles anchored on reduced graphene oxide nanosheets for high-performance supercapacitors

Highly Efficient Materials Assembly Via Electrophoretic Deposition for Electrochemical Energy Conversion and Storage Devices

Formation of a Flower‐Like Co−Mo−S on Reduced Graphene Oxide Composite on Nickel Foam with Enhanced Electrochemical Capacitive Properties

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