Preparation of Sandwich-like NiCo2O4/rGO/NiO Heterostructure on Nickel Foam for High-Performance Supercapacitor Electrodes

Li, Delong; Gong, Youning; Wang, Miaosheng; Pan, Chunxu

doi:10.1007/s40820-016-0117-1

Cited by 65 publications

(41 citation statements)

References 38 publications

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“…It was noted that the specific capacitance dropped more dramatically at the current density of 0.25 A g −1 in the first 1000 cycles, from 67.82 to 57.34 F g −1 , and the corresponding capacitance retention declined to 86.11% at the same time. This is probably because the electrolyte ions diffuse adequately to the electroactive material surfaces at a low current density, where the redox was carried out more effectively than that at higher current densities, leading to more structural defects and much faster capacitance degradation [ 58 , 59 ]. After increasing the charging and discharging currents, the capacitance was retained much better, with the capacitance loss less than 5% after the 5000th time.…”

Section: Resultsmentioning

confidence: 99%

Toward Flexible and Wearable Embroidered Supercapacitors from Cobalt Phosphides-Decorated Conductive Fibers

Wen

Zhou

2019

Nano-Micro Lett.

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HIGHLIGHTS• The conductive silver-plated nylon yarns fully fit the demand for wearable supercapacitor skeleton, owing to the advantages of high conductivity and flexibility.• The computerized programming embroidering technique was firstly applied for realizing standardized batch processing of the flexible supercapacitor skeleton in various patterns.• Cobalt phosphides were properly electrodeposited on the conductive embroidery as the pseudocapacitive materials, providing remarkable electrochemical performance. ABSTRACT Wearable supercapacitors (SCs)are gaining prominence as portable energy storage devices. To develop high-performance wearable SCs, the significant relationship among material, structure, and performance inspired us with a delicate design of the highly wearable embroidered supercapacitors made from the conductive fibers composited. By rendering the conductive interdigitally patterned embroidery as both the current collector and skeleton for the SCs, the novel pseudocapacitive material cobalt phosphides were then successfully electrodeposited, forming the first flexible and wearable in-plane embroidery SCs. The electrochemical measurements manifested that the highest specific capacitance was nearly 156.6 mF cm −2 (65.72 F g −1 ) at the current density of 0.6 mA cm −2 (0.25 A g −1 ), with a high energy density of 0.013 mWh cm −2 (5.55 Wh kg −1 ) at a power density of 0.24 mW cm −2 (100 W kg −1 ). As a demonstration, a monogrammed pattern was ingeniously designed and embroidered on the laboratory gown as the wearable in-plane SCs, which showed both decent electrochemical performance and excellent flexibility.

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Section: Resultsmentioning

confidence: 99%

Toward Flexible and Wearable Embroidered Supercapacitors from Cobalt Phosphides-Decorated Conductive Fibers

Wen

Zhou

2019

Nano-Micro Lett.

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“…Graphene and graphene-based materials have very attractive physical and optical properties [ 1 – 3 ] which can be employed into a lot of applications such as nanoelectronics [ 4 ], chemical and biosensors [ 5 , 6 ], solar-cells [ 7 ], effective catalysts [ 8 ], and supercapacitors [ 9 , 10 ]. A necessity of inexpensive mass production of these materials directed the interest of a great army of researchers into the study of graphene oxide (GO) reduction [ 11 ] which allows obtaining a graphene material with needed properties using chemical [ 12 ] or radiation [ 13 ] methods.…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Reduction of Graphene Oxide: Electrical Conductance and Scanning Kelvin Probe Force Microscopy

et al. 2018

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Graphene oxide (GO) films were formed by drop-casting method and were studied by FTIR spectroscopy, micro-Raman spectroscopy (mRS), X-ray photoelectron spectroscopy (XPS), four-points probe method, atomic force microscopy (AFM), and scanning Kelvin probe force (SKPFM) microscopy after low-temperature annealing at ambient conditions. It was shown that in temperature range from 50 to 250 °C the electrical resistivity of the GO films decreases by seven orders of magnitude and is governed by two processes with activation energies of 6.22 and 1.65 eV, respectively. It was shown that the first process is mainly associated with water and OH groups desorption reducing the thickness of the film by 35% and causing the resistivity decrease by five orders of magnitude. The corresponding activation energy is the effective value determined by desorption and electrical connection of GO flakes from different layers. The second process is mainly associated with desorption of oxygen epoxy and alkoxy groups connected with carbon located in the basal plane of GO. AFM and SKPFM methods showed that during the second process, first, the surface of GO plane is destroyed forming nanostructured surface with low work function and then at higher temperature a flat carbon plane is formed that results in an increase of the work function of reduced GO.Electronic supplementary materialThe online version of this article (10.1186/s11671-018-2536-z) contains supplementary material, which is available to authorized users.

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“…To solve above problems, much efforts focused on adding flexible polymers into the pure carbon based fibers, such as polyvinylalcohol (PVA), thermoplastic polyurethane (TPU), cellulose, and chitosan, to further enhance their flexibility, while sacrificing their conductivity. The electrically active materials with Faradic pseudocapacitance (for examples, metal oxide or conductive polymers) were in corporation with nanocarbon/polymer composite fibers for further improving the charge‐storage of supercapacitors. Among these electrically active materials, polyaniline (PANI) is a good candidate for its easy preparation, chemical stability, and large pseudocapacitance.…”

Section: Introductionmentioning

confidence: 99%

Microfluidic‐Spinning‐Directed Conductive Fibers toward Flexible Micro‐Supercapacitors

Tong

et al. 2018

Macro Materials & Eng

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The large‐scale fabrication of the flexible fiber‐shaped micro‐supercapacitors has received major attention from both industrial and academic researchers. Herein, conductive and robust polyaniline‐wrapped multiwall carbon tubes reduced graphene oxide/thermoplastic polyurethane (PANI/MCNTs‐rGO/TPU) composite fibers are successfully fabricated on a large scale via the combination of facile microfluidic‐spinning process and in situ polymerization of aniline. Initially, MCNTs‐rGO/TPU fibers are formed in a T‐shape microfluidic chip, relying on the fast material diffusion and exchange in the microfluidic channel. Then, PANI/MCNTs‐rGO/TPU hybrid fibers are synthesized through an in situ chemical oxidative polymerization of aniline. With the assistance of polyaniline, these PANI/MCNTs‐rGO/TPU hybrid fibers exhibit enhanced electrochemical properties in comparison with pure MCNTs‐rGO/TPU fibers, especially in high specific capacitance, which is dramatically increased from 42.1 to 155.5 mF cm−2. Moreover, the PANI/MCNTs‐rGO/TPU hybrid fibers can endure various blending stresses, contributing to its outperforming flexibility and weavability. The best of the excellent electrochemical and mechanical properties of these conductive fibers is made to construct the flexible supercapacitors and various complicated functional fabrics.

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Preparation of Sandwich-like NiCo2O4/rGO/NiO Heterostructure on Nickel Foam for High-Performance Supercapacitor Electrodes

Cited by 65 publications

References 38 publications

Toward Flexible and Wearable Embroidered Supercapacitors from Cobalt Phosphides-Decorated Conductive Fibers

Toward Flexible and Wearable Embroidered Supercapacitors from Cobalt Phosphides-Decorated Conductive Fibers

Low-Temperature Reduction of Graphene Oxide: Electrical Conductance and Scanning Kelvin Probe Force Microscopy

Microfluidic‐Spinning‐Directed Conductive Fibers toward Flexible Micro‐Supercapacitors

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