An Electrochemical Capacitor Based on a Ni(OH)[sub 2]/Activated Carbon Composite Electrode

Park, Jae Hyung; Park, O. Ok; Shin, Kyung Shik; Jin, Chang Soo; Kim, Jong Huy

doi:10.1149/1.1432245

Cited by 211 publications

(97 citation statements)

References 7 publications

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“…Therefore, hydrophobic pores are both inaccessible for ions and electrochemical inactive. 25 The introduction of hydrophilic TiO 2 produces faradaic pseudo-capacitance. Vulcan XC-72 has a high specific area and excellent conductivity.…”

Section: Resultsmentioning

confidence: 99%

Carbon Felt Coated with Titanium Dioxide/Carbon Black Composite as Negative Electrode for Vanadium Redox Flow Battery

Tseng

Huang

et al. 2014

J. Electrochem. Soc.

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This investigation focuses on the effect of titanium dioxide (TiO 2 ) coatings of a carbon black (XC-72) negative electrode on the performance of a vanadium redox flow battery (VRFB). TiO 2 , a hydrophilic material, was added to the carbon electrode to improve the wettability and reduce the electrical resistance of the electrode surface. The electrochemical performances of homemade TiO 2 , commercial TiO 2 , and carbon felt are investigated by using cyclic voltammetry and single-cell charge-discharge measurements. An electrode with 20 wt% of fabricated TiO 2 loading at a scan rate of 0.006 V s −1 shows a specific capacitance (C s,t ) of 186.2 F g −1 , which is 55.5% and 12.2% higher than that of pure carbon electrode (119.7 F g −1 ) and commercial TiO 2 (166.0 F g −1 ), respectively. At current density of 200 mA cm −2 , the energy storage efficiency (η E = 65.4%) of the single cell with 20 wt% homemade TiO 2 /C-containing carbon felt negative electrode is 16.0% and 6.1% higher than that of the negative electrode with raw carbon felt (η E = 56.4%) and of the negative electrode containing commercial TiO 2 /C (η E = 61.6%), respectively. These results demonstrate the potential application of TiO 2 /C electrodes for high-efficiency VRFBs at high current densities. Vanadium redox flow battery (VRFB) has been proposed as a promising candidate for large scale energy storage applications, such as load-leveling applications. VRFB can store and stabilize intermittent electricity generated from wind turbine or photovoltaic. VRBF has several advantages over other types of batteries, such as excellent electrochemical reversibility, high roundtrip efficiency, flexible, and negligible cross-contamination between positive and negative electrolytes.1-5 VRFB employs V(IV)/V(V) and V(II)/V(III) redox couples as positive and negative half-cells, respectively, with the standard open circuit cell potential approximate 1.26 V at 100% state of charge. 6Carbon felt is a typical electrode material and it has wide operating electrode potential range, chemically stable, high surface area, and reasonable price. However, carbon felt electrode shows poor electrochemical activity. Therefore, much attention has been focus to electrode modification to enhance its electrochemical properties. [7][8][9][10][11][12][13][14] Several alternative electrode materials have been proposed to improve electrode performance, such as metal electrodeposition on carbon fibers. Various metal compounds have also been deposited on graphite fibers to improve the catalytic activity for vanadium redox couples and to enhance electrode stability in acidic vanadium solution. In the literature, metal compounds deposited on carbon felts include IrO 2, 9 Ru(O 2 ), 10 and Ir, 11 whereas others include partial modification of the functional groups on the graphite surface.12,13 The coating of metal nanoparticles on the fiber of carbon felt is a promising approach. Recently, transition metal oxides, e.g. TiO 2 , ZnO, have been studied extensively as a water adsorbent for improv...

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Section: Resultsmentioning

confidence: 99%

Carbon Felt Coated with Titanium Dioxide/Carbon Black Composite as Negative Electrode for Vanadium Redox Flow Battery

Tseng

Huang

et al. 2014

J. Electrochem. Soc.

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“…Pseudocapacitance has been studied for various metal oxides, such as RuO 2 [1,2], CoO x [3,4], NiO [5 10], and MnO 2 [11 13], due to their higher specific capacitance (SC) compared to carbon-based materials [1 13] and better stability than conducting polymers [14]. In particular, NiO enjoys a special place due to its easy availability, environmentally benign nature, cost effectiveness, and good pseudocapacitive behavior.…”

Section: Nano Researchmentioning

confidence: 99%

Template-free synthesis of ordered mesoporous NiO/poly(sodium-4-styrene sulfonate) functionalized carbon nanotubes composite for electrochemical capacitors

et al. 2009

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We report the first example of a practical and efficient template-free strategy for synthesizing ordered mesoporous NiO/poly(sodium-4-styrene sulfonate) (PSS) functionalized carbon nanotubes (FCNTs) composites by calcining a Ni(OH) 2 /FCNTs precursor prepared by refl uxing an alkaline solution of Ni(NH 3 ) x 2+and FCNTs at 97 o C for 1 h. The morphology and structure were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Thermal decomposition of the precursor results in the formation of ordered mesoporous NiO/FCNTs composite (ca. 48 wt% NiO) with large specifi c surface area. Due to its enhanced electronic conductivity and hierarchical (meso-and macro-) porosity, composite simultaneously meets the three requirements for energy storage in electrochemical capacitors at high rate, namely, good electron conductivity, highly accessibleelectrochemical surface areas owing to the existence of mesopores, and efficient mass transport from the macropores. Electrochemical data demonstrated that the ordered mesoporous NiO/FCNTs composite is capable of delivering a specifi c capacitance (SC) of 526 F/g at 1 A/g and a SC of 439 F/g even at 6 A/g, and show a degradation of only ca. 6% in SC after 2000 continuous charge/discharge cycles. KEYWORDSTemplate-free, ordered mesopores, NiO/carbon nanotubes composite, hierarchical porosity, electrochemical supercapacitors Nano ResearchPseudocapacitance has been studied for various metal oxides, such as RuO 2 [1,2], CoO x [3,4], NiO [5 10], and MnO 2 [11 13], due to their higher specific capacitance (SC) compared to carbon-based materials [1 13] and better stability than conducting polymers [14]. In particular, NiO enjoys a special place due to its easy availability, environmentally benign nature, cost effectiveness, and good pseudocapacitive behavior. Unfortunately, there are still some obstacles to its practical application due to its low observed SC [5 10], considering its theoretical value (2573 F/g within 0.5 V) [5,6]. The key strategy is to maximize the electrochemical utilization of the NiO phase. Pseudocapacitance is an interfacial phenomenon related to the specifi c surface area (SSA) of electroactive materials and involving 723 Nano Res (2009) 2: 722 732 charge transfer through surface Faradaic reactions [15]. Moreover, to obtain high-energy density at larger current densities, it is necessary to fabricate materials with a hierarchical (meso-and macro-) porous structure. The mesoporous structure affords high SSA and electrochemical energy storage of the electroactive material [3], whilst the macropores can absorb and strongly retain electrolyte ions, which ensures suffi cient Faradaic reactions take place at high current densities [16]. Therefore, the development of effective ways to enhance the electronic conductivity and the SSA of NiO phases with hierarchical porosities are of great significance for the nextgeneration electrochemical capacitors (ECs).Recently, carbon nanotubes (CNTs)-based NiO composites have bee...

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“…Activated carbon (AC) [13][14][15], carbon nanotubes (CNTs) [16][17][18][19], grapheme (GR) [20][21][22][23][24][25], expanded graphite (EG) [26] and Vulcan XC-72 [27] have been widely investigated. Besides, tremendous works have been done to fabricate aqueous electrolyte-based ASC, with nickel hydroxide-carbon composites as the positive electrode and commercial activated carbon (AC) as the negative electrode material (denoted as AC//Ni(OH)2/C).…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of high-performance Ni(OH)2/expanded graphite electrodes for asymmetric supercapacitors

Yuan

Tang

Zhu

et al. 2017

J Mater Sci: Mater Electron

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Cost-effectively commercial expanded graphite (EG) was used as a raw material, and a facile insitu electrodeposited method has been adopted to synthesize a layered Ni(OH)2/EG composite electrode in a N,N-dimethylformamide-water system. The structure composed of expanded graphite sheets, Ni(OH)2 nanoparticles and carbon nanotubes can be observed by Scanning electron microscopy, which not only effectively restraint the restacking of EG sheets but also prevents the aggregation of nickel hydroxide particles. The obtained electrode shows better capacitive performances with satisfactory initial specific capacitance (1719.5 F/g at 1 A/g), remarkable rate capability (1181.3 F/g at 10 A/g) based on a total mass loading of 5.0 mg/cm 2 . Furthermore, an asymmetric supercapacitor (ASC) device, with a negative electrode of commercial activated carbon (AC) and a positive electrode of as-prepared composite, delivers a prominent energy density of 32.3 Wh/kg at power density 504.7 W/kg, long cycling life with 79% original capacitance after 1000 cycles. Consequently, the facile synthesized highperformance Ni(OH)2/expanded graphite electrodes are expected to be applied for energy 2 storage/conversion.

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An Electrochemical Capacitor Based on a Ni(OH)[sub 2]/Activated Carbon Composite Electrode

Cited by 211 publications

References 7 publications

Carbon Felt Coated with Titanium Dioxide/Carbon Black Composite as Negative Electrode for Vanadium Redox Flow Battery

Carbon Felt Coated with Titanium Dioxide/Carbon Black Composite as Negative Electrode for Vanadium Redox Flow Battery

Template-free synthesis of ordered mesoporous NiO/poly(sodium-4-styrene sulfonate) functionalized carbon nanotubes composite for electrochemical capacitors

Facile synthesis of high-performance Ni(OH)2/expanded graphite electrodes for asymmetric supercapacitors

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