Flexible Asymmetric Supercapacitors Based upon Co9S8 Nanorod//Co3O4@RuO2 Nanosheet Arrays on Carbon Cloth

Xu, Jing; Wang, Qiufan; Wang, Xiaowei; Xiang, Qingyi; Liang, Bo; Chen, Di; Shen, Guozhen

doi:10.1021/nn401450s

Cited by 621 publications

(390 citation statements)

References 36 publications

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“…The device exhibited a high volumetric power density (maximum output value) of 17.5 W cm −3 while retaining its high energy density of 1.95 mWh cm −3 at a current of 1 mA. This value remained almost constant with increasing current, which is comparable or better than most of the reported symmetric or asymmetric devices (SDs or ADs)47 based on the volumetric density, such as ZnO@C@MnO 2 ‐SDs,48 TiO 2 @C‐SDs,49 WO 3− x /MoO 3− x //PANI/carbon fabric‐Ads,50 H‐TiO 2 @MnO 2 //H‐TiO 2 @C‐ADs,51 laser‐scribed graphene SDs,52 MnO 2 //Fe 2 O 3 ADs,53 Co 9 S 8 //Co 3 O 4 @RuO 2 ‐ADs,54 and ZnO@MnO 2 //RGO‐ADs 55. The energy density and power density based on the total mass of the hybrid battery are shown in Figure S19 (Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

S, N‐Co‐Doped Graphene‐Nickel Cobalt Sulfide Aerogel: Improved Energy Storage and Electrocatalytic Performance

et al. 2016

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Metal sulfides are commonly used in energy storage and electrocatalysts due to their redox centers and active sites. Most literature reports show that their performance decreases significantly caused by oxidation in alkaline electrolyte during electrochemical testing. Herein, S and N co‐doped graphene‐based nickel cobalt sulfide aerogels are synthesized for use as rechargeable alkaline battery electrodes and oxygen reduction reaction (ORR) catalysts. Notably, this system shows improved cyclability due to the stabilization effect of the S and N co‐doped graphene aerogel (SNGA). This reduces the rate of oxidation and the decay of electronic conductivity of the metal sulfides materials in alkaline electrolyte, i.e., the capacity decrease of CoNi2S4/SNGA is 4.2% for 10 000 cycles in a three‐electrode test; the current retention of 88.6% for Co—S/SNGA after 12 000 s current–time chronoamperometric response in the ORR test is higher than corresponding Co—S nanoparticles and Co—S/non‐doped graphene aerogels. Importantly, the results here confirm that the Ni—Co—S ternary materials behave as an electrode for rechargeable alkaline batteries rather than supercapacitors electrodes in three‐electrode test as commonly described and accepted in the literature. Furthermore, formulas to evaluate the performance of hybrid battery devices are specified.

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Section: Resultsmentioning

confidence: 99%

S, N‐Co‐Doped Graphene‐Nickel Cobalt Sulfide Aerogel: Improved Energy Storage and Electrocatalytic Performance

et al. 2016

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“…Therefore, the challenge for current supercapacitor technology is to improve the energy density without sacrifi cing the power density and the cycle life. [5][6][7][8][9][10][11][12] Carbon, conductive polymers, and metal oxides are currently being extensively studied as electrode materials for supercapacitors. Due to the limitations of reversible ion absorption at the electrode/electrolyte interface, the specifi c capacitance of carbon-based materials is generally low.…”

Section: Introductionmentioning

confidence: 99%

NiCo₂S₄ Nanosheets Grown on Nitrogen‐Doped Carbon Foams as an Advanced Electrode for Supercapacitors

Shen¹,

Wang²,

Xu³

et al. 2014

Advanced Energy Materials

775

381

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mers usually suffer from poor cyclic stability in long term charge-discharge processes. [ 15 ] The low electron conductivity of transition metal oxides leads to inferior rate capability. [ 16 ] In the search for high performance electrode materials, transition-metal sulfi des have been extensively studied as new class of pseudocapacitive materials for supercapacitors. [17][18][19][20] In particular, NiCo 2 S 4 possess higher electrochemical activity and higher capacity than mono-metal sulphides based on richer redox reactions. [ 21,22 ] More signifi cantly, NiCo 2 S 4 exhibited an excellent electrical conductivity, at least two orders of magnitude higher than that of NiCo 2 O 4 . [ 23 ] The development of novel nanostructured materials will effectively improve the utilization of active materials because of their high surface area, and short electron-and ion-transport pathways. Several different types of NiCo 2 S 4 nanostructures, including nanoplates, [ 24 ] nanoprisms, [ 25 ] nanotubes, [ 26,27 ] microspheres, [ 28 ] have been recently synthesized and their electrochemical performance was investigated. For example, Lou et al. [ 25 ] reported the fabrication of Ni x Co 3-x S 4 hollow nanoprisms through a simple sacrifi cial template method and a high reversible capacity (895 F g −1 under 1 A g −1 ) can be achieved. However, it should be noted that the introduction of a conductive agent and a polymer binder during the thin fi lm electrode preparation not only increase extra contact resistance but also inevitably compromises the overall energy storage capacity that still seriously limit their performance. [ 29,30 ] Three dimensional (3D) electrode architectures have emerged as a new direction because it can provide 3D interconnected network of both electron and ion pathways, allowing for effi cient charge and mass exchange during faradic redox reactions. Greatly enhanced performance has kindled the interest of researchers in the fi eld of 3D electrode architectures designs, such as copper pillar array, [ 31 ] nickel network, [ 32,33 ] stainless steel mesh, [ 34 ] carbonaceous interpenetrating structures. [ 35 ] The rigid electrode with metals as current collectors lead to the devices less fl exible, and they also have a low energy density. Carbon nanotubes sponge and graphene foams have been recently fabricated using chemical vapor deposition and used as electrode architectures for supercapacitors. [36][37][38] However, it is diffi cult to produce carbonaceous foams in large-scale because of their relatively high-cost and complex preparation processes. Additionally, due to the potential incompatibility issue between To push the energy density limit of supercapacitors, a new class of electrode materials with favorable architectures is strongly needed. Binary metal sulfi des hold great promise as an electrode material for high-performance energy storage devices because they offer higher electrochemical activity and higher capacity than mono-metal sulfi des. Here, the rational design and fabrication of NiCo 2 S 4 nan...

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“…Using both Faradaic and nonFaradaic processes to store charge, hybrid capacitors can achieve energy and power densities greater than EDLCs without sacrificing the cycling stability and affordability that have so far limited the success of pseudocapacitors (4). Several combinations of materials, such as RuO 2 (5), Co 3 O 4 (6), NiO (7), V 2 O 5 (8), Ni(OH) 2 (9), and MnO 2 (10), have been studied for preparing hybrid supercapacitors. Among these, MnO 2 -based systems are particularly attractive as MnO 2 is an earth-abundant and environmentally friendly material with a high theoretical specific capacitance of 1,380 F/g (11).…”

mentioning

confidence: 99%

Engineering three-dimensional hybrid supercapacitors and microsupercapacitors for high-performance integrated energy storage

El‐Kady

Ihns

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

524

321

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Supercapacitors now play an important role in the progress of hybrid and electric vehicles, consumer electronics, and military and space applications. There is a growing demand in developing hybrid supercapacitor systems to overcome the energy density limitations of the current generation of carbon-based supercapacitors. Here, we demonstrate 3D high-performance hybrid supercapacitors and microsupercapacitors based on graphene and MnO 2 by rationally designing the electrode microstructure and combining active materials with electrolytes that operate at high voltages. This results in hybrid electrodes with ultrahigh volumetric capacitance of over 1,100 F/cm 3 . This corresponds to a specific capacitance of the constituent MnO 2 of 1,145 F/g, which is close to the theoretical value of 1,380 F/g. The energy density of the full device varies between 22 and 42 Wh/l depending on the device configuration, which is superior to those of commercially available double-layer supercapacitors, pseudocapacitors, lithium-ion capacitors, and hybrid supercapacitors tested under the same conditions and is comparable to that of lead acid batteries. These hybrid supercapacitors use aqueous electrolytes and are assembled in air without the need for expensive "dry rooms" required for building today's supercapacitors. Furthermore, we demonstrate a simple technique for the fabrication of supercapacitor arrays for high-voltage applications. These arrays can be integrated with solar cells for efficient energy harvesting and storage systems.A s a result of the rapidly growing energy needs of modern life, the development of high-performance energy storage devices has gained significant attention. Supercapacitors are promising energy storage devices with properties intermediate between those of batteries and traditional capacitors, but they are being improved more rapidly than either (1). Over the past couple of decades, supercapacitors have become key components of everyday products by replacing batteries and capacitors in an increasing number of applications. Their high power density and excellent low-temperature performance have made them the technology of choice for backup power, cold starting, flash cameras, regenerative braking, and hybrid electric vehicles (2, 3). The future growth of this technology depends on further improvements in energy density, power density, calendar and cycle life, and production cost.According to their charge storage mechanism, supercapacitors are classified as either electric double-layer capacitors (EDLCs) or pseudocapacitors (2). In EDLCs, charge is stored through rapid adsorption-desorption of electrolyte ions on high-surfacearea carbon materials, whereas pseudocapacitors store charge via fast and reversible Faradaic reactions near the surface of metal oxides or conducting polymers. The majority of supercapacitors currently available in the market are symmetric EDLCs featuring activated carbon electrodes and organic electrolytes that provide cell voltages as high as 2.7 V. Although these EDLCs exhibit high...

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Flexible Asymmetric Supercapacitors Based upon Co₉S₈ Nanorod//Co₃O₄@RuO₂ Nanosheet Arrays on Carbon Cloth

Cited by 621 publications

References 36 publications

S, N‐Co‐Doped Graphene‐Nickel Cobalt Sulfide Aerogel: Improved Energy Storage and Electrocatalytic Performance

S, N‐Co‐Doped Graphene‐Nickel Cobalt Sulfide Aerogel: Improved Energy Storage and Electrocatalytic Performance

NiCo₂S₄ Nanosheets Grown on Nitrogen‐Doped Carbon Foams as an Advanced Electrode for Supercapacitors

Engineering three-dimensional hybrid supercapacitors and microsupercapacitors for high-performance integrated energy storage

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Flexible Asymmetric Supercapacitors Based upon Co9S8 Nanorod//Co3O4@RuO2 Nanosheet Arrays on Carbon Cloth

Cited by 621 publications

References 36 publications

S, N‐Co‐Doped Graphene‐Nickel Cobalt Sulfide Aerogel: Improved Energy Storage and Electrocatalytic Performance

S, N‐Co‐Doped Graphene‐Nickel Cobalt Sulfide Aerogel: Improved Energy Storage and Electrocatalytic Performance

NiCo2S4 Nanosheets Grown on Nitrogen‐Doped Carbon Foams as an Advanced Electrode for Supercapacitors

Engineering three-dimensional hybrid supercapacitors and microsupercapacitors for high-performance integrated energy storage

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Flexible Asymmetric Supercapacitors Based upon Co₉S₈ Nanorod//Co₃O₄@RuO₂ Nanosheet Arrays on Carbon Cloth

NiCo₂S₄ Nanosheets Grown on Nitrogen‐Doped Carbon Foams as an Advanced Electrode for Supercapacitors