Construction of High-Capacitance 3D CoO@Polypyrrole Nanowire Array Electrode for Aqueous Asymmetric Supercapacitor

Zhou, Cheng; Zhang, Yangwei; Li, Yuanyuan; Liu, Jinping

doi:10.1021/nl400378j

Cited by 1,288 publications

(738 citation statements)

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“…The areal capacitance of the ANF electrode reached 2.04 F cm À2 at the current density of 8 mA cm À2 (Figure 3d), which is more than 10 times that of the value obtained for the NF electrode (0.20 F cm À2 ). This present areal capacitance obtained at such a high discharge current density is also considerably higher than that of recently reported NF-based electrodes, such as Ni(OH) 2 @NF (1.6 F cm À2 at 2 mA cm À2 ), 35 NiCo 2 O 4 @NF (1.5 F cm À2 at 5 mAcm À2 ), 36 CoMoO 4 @NF (1.26 F cm À2 at 4 mA cm À2 ), 37 CoO@NF (1.23 F cm À2 at 1 mA cm À2 ) 23 and MnO 2 @NF (0.25 F cm À2 at 1.03 mA cm À2 ). 38 Moreover, the ANF electrode exhibits an excellent rate capability with more than 55% retention of the initial capacitance as the current density increases from 8 to 20 mA cm À2 .…”

Section: Resultsmentioning

confidence: 59%

“…16 Moreover, the ANF//RGO-ASC device also exhibited a superior power density of 0.42 W cm À3 , which is considerably higher than that of SSCs and ASCs. 1, [23][24][25][26][27][28][29] After charging at a current density of 20 mA cm À2 for 10 s, a tandem device with three ANF//RGO-ASC devices in series could power a light-emitting diode array display (4-5 V) for B1 min (inset in Figure 5). Moreover, because of the unique porous structure and strong mechanical properties, the volumetric performance of the ANF//RGO-ASC device can be further improved by compression of the device.…”

Section: Figure 1 (A) Schematic Diagram Illustrating the Activation Pmentioning

confidence: 99%

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Scalable self-growth of Ni@NiO core-shell electrode with ultrahigh capacitance and super-long cyclic stability for supercapacitors

et al. 2014

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Three-dimensional (3D) electrodes have been demonstrated to be promising candidates for high-performance supercapacitors because of their unique architectures and outstanding electrochemical properties. However, the fabrication process for current 3D electrodes is not scalable. Herein, a novel and cost-effective activation process has been developed to macroscopically produce 3D porous Ni@NiO core-shell electrodes with enhanced electrochemical properties. The porous Ni@NiO core-shell electrode obtained by activated commercial Ni foam (NF) in a 3 M HCl solution yields an ultrahigh areal capacitance of 2.0 F cm À2 at a high current density of 8 mA cm À2 , which is substantially higher than that of most reported 3D NF-based electrodes. Moreover, the activated NF (ANF) electrode exhibited super-long cycling stability. Owing to the increased accessible surface area and continual formation of electrochemically active NiO during cycling, the areal capacitance of the ANF electrode did not exhibit any decay and instead increased from 0.47 to 1.27 F cm À2 after 100 000 cycles at 100 mV s À1 . This is the best cycling stability achieved by a 3D NF-based electrode. Additionally, a high-performance asymmetrical supercapacitor (ASC) device based on the as-prepared ANF cathode and a reduced graphene oxide (RGO) anode was also prepared. The ANF//RGO-ASC device was able to deliver a maximum energy density of 1.06 mWh cm À3 and a maximum power density of 0.42 W cm À3 .

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Section: Resultsmentioning

confidence: 59%

Section: Figure 1 (A) Schematic Diagram Illustrating the Activation Pmentioning

confidence: 99%

Scalable self-growth of Ni@NiO core-shell electrode with ultrahigh capacitance and super-long cyclic stability for supercapacitors

et al. 2014

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“…Polypyrrole with highly electrical conductivity is anchored to the surface of CoO, facilitating the electron transport and the electrical connection with the current collector 355. Further application for the hybrid as an aqueous asymmetric supercapacitor device is also investigated with high energy density of 43.5 Wh kg –1 at a maximum voltage of 1.8 V.…”

Section: Electrode Materialsmentioning

confidence: 99%

Materials Design and System Construction for Conventional and New‐Concept Supercapacitors

et al. 2017

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With the development of renewable energy and electrified transportation, electrochemical energy storage will be more urgent in the future. Supercapacitors have received extensive attention due to their high power density, fast charge and discharge rates, and long‐term cycling stability. During past five years, supercapacitors have been boomed benefited from the development of nanostructured materials synthesis and the promoted innovation of devices construction. In this review, we have summarized the current state‐of‐the‐art development on the fabrication of high‐performance supercapacitors. From the electrode material perspective, a variety of materials have been explored for advanced electrode materials with smart material‐design strategies such as carbonaceous materials, metal compounds and conducting polymers. Proper nanostructures are engineered to provide sufficient electroactive sites and enhance the kinetics of ion and electron transport. Besides, new‐concept supercapacitors have been developed for practical application. Microsupercapacitors and fiber supercapacitors have been explored for portable and compact electronic devices. Subsequently, we have introduced Li‐/Na‐ion supercapacitors composed of battery‐type electrodes and capacitor‐type electrode. Integrated energy devices are also explored by incorporating supercapacitors with energy conversion systems for sustainable energy storage. In brief, this review provides a comprehensive summary of recent progress on electrode materials design and burgeoning devices constructions for high‐performance supercapacitors.

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“…25 The mass of both active material and AC was controlled based on the principle of charge balance at the scanning rate of 25 mV s − 1 and the comparative CV curves of NiCo 2 O 4 and AC electrodes performed in a three-electrode system are shown in Figure 6a. According to previous report, 25 the AC exhibits a typical characteristic of electric double-layer capacitance in an electrolyte of KOH aqueous solution within the range of − 1.2-0 V. Therefore, the working voltage of asymmetric supercapacitor device can be expected to reach to 1.8 V. Figure 6b exhibits the C-V curves of the full cell and the cell voltage is as large as 1.8 V, which is almost twice that of conventional AC-based symmetric capacitors in aqueous electrolytes (0.8-1.0 V). Obviously, all the curves behave similar in shape and are much more rectangular as compared with those of NiCo 2 O 4 electrode in three-electrode testing.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Integrating large specific surface area and high conductivity in hydrogenated NiCo2O4 double-shell hollow spheres to improve supercapacitors

et al. 2015

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Increasing specific surface area and electrical conductivity are two crucial ways to improve the capacitive performance of electrode materials. Nanostructure usually enlarges the former but reduces the later; thus, it is still a great challenge to overcome such contradiction. Here, we report hydrogenated NiCo 2 O 4 double-shell hollow spheres, combining large specific surface area and high conductivity to improve the capacitive performance of supercapacitors. The specific surface area of NiCo 2 O 4 hollow spheres, fabricated via programmed coating of carbon spheres, was enlarged 50% (from 76.6 to 115.2 m 2 g − 1 ) when their structure was transformed from single-shell to double-shell. Furthermore, activated carbon impedance measurements demonstrated that the low-temperature hydrogenation greatly decreased both the internal resistance and the Warburg impedance. Consequently, a specific capacitance increase of 462%, from 445 to 718 F g − 1 , was achieved at a current density of 1 A g − 1 .Underlying such great improvement, the evolution of chemical valence and defect states with co-increase of these two factors was explored through X-ray photoelectron spectroscopy. Moreover, a full cell combined with NiCo 2 O 4 and AC was assembled, and an energy density of 34.8 Wh kg − 1 was obtained at a power density of 464 W kg − 1 . NPG Asia Materials (2015) 7, e165; doi:10.1038/am.2015.11; published online 13 March 2015 INTRODUCTION Supercapacitors, also known as electrochemical capacitors, have attracted great attention because of their outstanding power density, long cycling life and fast charge/discharge ability. 1-3 These virtues make them remarkable candidates for the electrical sources of hybrid electric vehicles, for which strong explosiveness is highly desired. Principally, supercapacitors run according to ion adsorption (electrochemical double-layer capacitors) or fast Faradaic reactions (pseudocapacitors) mechanisms. Comparatively speaking, the former has low specific capacitance and hence hard to satisfy the growing demand of peak-power assistance in electric vehicles. 4 Thus, more and more attentions were focused on pseudocapacitive electrode materials because their energy density associated with Faradaic reactions is much larger than that of electrochemical double-layer capacitors. [5][6][7][8] To improve performances of pseudocapacitors, two crucial factors are usually considered for the electrode materials, they are large specific surface area and high conductivity for electrolyte ions and electrons. On the one hand, large specific surface area will provide more electroactive sites for the Faradaic reactions, and load more doublelayer charges. Along such idea, many kinds of nanomaterials, 9-11 especially hollow spheres, 12 have been developed to improve

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Construction of High-Capacitance 3D CoO@Polypyrrole Nanowire Array Electrode for Aqueous Asymmetric Supercapacitor

Cited by 1,288 publications

References 64 publications

Scalable self-growth of Ni@NiO core-shell electrode with ultrahigh capacitance and super-long cyclic stability for supercapacitors

Scalable self-growth of Ni@NiO core-shell electrode with ultrahigh capacitance and super-long cyclic stability for supercapacitors

Materials Design and System Construction for Conventional and New‐Concept Supercapacitors

Integrating large specific surface area and high conductivity in hydrogenated NiCo2O4 double-shell hollow spheres to improve supercapacitors

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