Meters‐Long Flexible CoNiO<sub>2</sub>‐Nanowires@Carbon‐Fibers Based Wire‐Supercapacitors for Wearable Electronics

Ai, Yuanfei; Lou, Zheng; Li, La; Chen, Shuai; Park, Ho Seok; Wang, Zhiming M.; Shen, Guozhen

doi:10.1002/admt.201600142

Cited by 74 publications

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“…[8][9][10] Many flexible and sometimes stretchable supercapacitors with impressive mechanical and electrochemical properties have been developed by using various material selections and designing strategies. [11][12][13][14][15][16] For www.advmattechnol.de that reversibly change its colors between green and blue during redox reactions. [38][39][40][41] Here, we report on a wearable second skin-like multifunctional supercapacitor with self-assembled vertical gold nanowires (v-AuNWs) and electrochromic PANI.…”

Section: Introductionmentioning

confidence: 99%

A Wearable Second Skin‐Like Multifunctional Supercapacitor with Vertical Gold Nanowires and Electrochromic Polyaniline

Ling

Gong

et al. 2018

Adv Materials Technologies

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example, carbon nanomaterials such as carbon nanotube (CNT) and graphene have been successfully used to construct supercapacitors based on various configurations with high capacitance, which could be sewn into textile to build senior stretchable power networks or attached on garments to power LED lights/commercial electronic watch. [17][18][19][20][21][22] Some supercapacitors have also been successfully combined with other energy harvesters to actualize wearable integration systems. [23,24] In addition, metal-based (such as gold and silver) nanomaterials including nanowires or nanoparticles with engineered layout on stretchable substrates or embedded in soft polymer matrix that establish flexible/ stretchable conductive films also begin to show their potential for utilizations in wearable energy devices. [25][26][27][28][29] Despite the encouraging progresses made in flexibility, stretchability, as well as impressive electrochemical performances based on multiple material and design combinations, very limited supercapacitors have actually enabled wearable on-skin applications. To date, it still remains as a great challenge to achieve a second skin-like supercapacitor that can integrate lightweightness, skin-thinness, high conformability, patternable features, and high capacitance into durable energy storage system working under all kinds of skin deformations. The recently reported epidermal supercapacitor based on ultrathin CNT film sheds light on the potential. [30] The as-fabricated supercapacitor could be seamlessly attached on human skin and function under various static skin deformations. Overall, the development of ultrathin skin-conformable supercapacitors with reasonably high capacitance that can operate under both static and dynamic skin deformations is still on the initial stage, which requires further efforts.Multifunctionality is another requirement for the next-generation wearable and implantable energy devices. [31] The application of electrochromic materials offers the superiority of combining energy storage and smart color transitions in one system. [32][33][34][35] As for supercapacitors, the colors of electrodes verify when applying different voltages so that the energy level of supercapacitors can be monitored easily by naked eyes. [36,37] PANI (polyaniline) as a popular polymer material has been widely used in supercapacitor area due to its relatively high conductivity, high pseudocapacitance, flexibility, and color-changing characteristics An ideal wearable/implantable bio-diagnostics can be powered by second skin-like energy devices in that they offer advantages such as conformal attachment/integration, lightweightness, and moduli-matching properties. Past several years have witnessed encouraging progresses in soft stretchable supercapacitors by various material combinations and design strategies; however, it remains nontrivial to achieve highly flexible high-performance supercapacitors in a skin-thin layout yet with multifunctionality. Here, such a second skin-like electrochromic supercapa...

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Section: Introductionmentioning

confidence: 99%

A Wearable Second Skin‐Like Multifunctional Supercapacitor with Vertical Gold Nanowires and Electrochromic Polyaniline

Ling

Gong

et al. 2018

Adv Materials Technologies

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“…Cycling stability (Figure 2e) was also measured as one of the critical parameters of the device, which remains ≈80% value of its initial capacitance after 10 000 galvanostatic charge/discharge cycles, demonstrating a good cycling performance of the device. [27] Further, Table 1 showed a summary of the structure, flexibility, and capacitance of the recently reported works, which demonstrate the outstanding electrochemical performances of our coaxial devices. The dependence of the phase angle on the frequency for the coaxial SCs is presented in Figure S2b (Supporting Information).…”

Section: Resultsmentioning

confidence: 78%

Hollow Polypyrrole Sleeve Based Coaxial Fiber Supercapacitors for Wearable Integrated Photosensing System

Lou

Chen

et al. 2018

Adv Materials Technologies

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electronics. [1][2][3][4][5][6] In order to safely and uninterruptedly drive these flexible electronics, a suitable energy storage with both fiber shape in the appearance to fit 1D geometries of integrated system and high power densities, long cycling life, and strong security in terms of electrochemical performances is extremely desired. [7][8][9] Fiber supercapacitors (SCs) that possess the features of good flexibility and weavability are considered to be one of the promising candidates due to their faster charge/discharge response and better security in comparison to Li-ions battery, Na/Mg ion battery, and photovoltaic cell and have seen a rapid development in the past few years. [10][11][12][13][14][15] To date, 1D fiber SCs are divided into two main types, including twisted and coaxial structure. [16,17] Among them, coaxial SCs have attracted more attention compared to the twisted one because of the closer distance between positive and negative electrode, more effective utilization of materials, and higher specific capacitances. [18][19][20] The core fabrication difficulty of coaxial SCs is how to form the sheath/shell-like electrode. Peng's group proposed to scroll carbon nanotube (CNT) sheet on another fiber electrode and they have demonstrated that coaxial SCs show larger specific capacitance of 59 F g −1 than that of twisted SCs (4.5 F g −1 ). [21] Although they achieved the goal of produce coaxial SCs, they failed to gain superior electrochemical performance as a result of increased contact resistance introduced by inconsecutive and rough CNT sheets. Similarly, Lee and co-workers [22] obtained coaxial structure via wrapping core fiber electrode by separator and carbon nanofiber (CNF) film. Unfortunately, the applications of separator and wrapping process bring a lot of difficulties for the ionic diffusion, maximizing material utilization and encapsulation of whole devices. [23] Therefore, it is still a big challenge to develop a simple yet efficient approach to directly fabricate coaxial SCs devices.In this work, we proposed a simple electrodeposition and etch approach to fabricate a micrometer hollow polypyrrole (PPy) sleeve based flexible coaxial fiber SCs device. The assembled coaxial fiber SCs exhibited a large volume capacitance of 2.44 F cm −3 (19.6 mF cm −2 ) and provided a power density of 0.96 W cm −3 at an area energy density of 0.07 mWh cm −3 . Moreover, the simulated results using ANSYS Maxwell software also showed a capacitance ratio of 5.14:1 between coaxial and twisted structure and demonstrated the better electrochemical performances Fiber supercapacitors (SCs) are robust power supply for wearable electronics due to their feasibility of weaving into textiles that breathe freely or integration into different functional materials that fit the curved surface of the human body. However, traditional twisted fiber SCs suffer from the low-energy density while coaxial fiber SCs undergo the complicated fabrication process of shelllike electrode. Here, a facile electrodeposition and etch approach ...

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“…This kind of 1D nanomaterial offers particular advantages due to its intrinsic high aspect ratio, peculiar microstructural characteristics, together with outstanding mechanical, electrical, magnetic, and optical properties, which enable their integration in novel energy conversion devices and data storage media, future stretchable electronic systems, sensors, and micro-nanodevices [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Ni-Co Alloy and Multisegmented Ni/Co Nanowire Arrays Modulated in Composition: Structural Characterization and Magnetic Properties

et al. 2017

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Design of novel multisegmented magnetic nanowires can pave the way for the next generation of data storage media and logical devices, magnonic crystals, or in magneto-plasmonics, among other energy conversion, recovery, and storage technological applications. In this work, we present a detailed study on the synthesis, morphology, structural, and magnetic properties of Ni, Co, and Ni-Co alloy and multisegmented Ni/Co nanowires modulated in composition, which were grown by template-assisted electrodeposition employing nanoporous anodic aluminum oxide as patterned templates. X-ray diffraction, and scanning and high-resolution transmission electron microscopies allowed for the structural, morphological, and compositional investigations of a few micrometers long and approximately 40 nm in diameter of pure Ni and Co single elements, together with multisegmented Ni/Co and alloyed Ni-Co nanowires. The vibrating sample magnetometry technique enabled us to extract the main characteristic magnetic parameters for these samples, thereby evaluating their different anisotropic magnetic behaviors and discuss them based on their morphological and structural features. These novel functional magnetic nanomaterials can serve as potential candidates for multibit magnetic systems in ultra-high-density magnetic data storage applications.

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Meters‐Long Flexible CoNiO₂‐Nanowires@Carbon‐Fibers Based Wire‐Supercapacitors for Wearable Electronics

Cited by 74 publications

References 50 publications

A Wearable Second Skin‐Like Multifunctional Supercapacitor with Vertical Gold Nanowires and Electrochromic Polyaniline

A Wearable Second Skin‐Like Multifunctional Supercapacitor with Vertical Gold Nanowires and Electrochromic Polyaniline

Hollow Polypyrrole Sleeve Based Coaxial Fiber Supercapacitors for Wearable Integrated Photosensing System

Ni-Co Alloy and Multisegmented Ni/Co Nanowire Arrays Modulated in Composition: Structural Characterization and Magnetic Properties

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Meters‐Long Flexible CoNiO2‐Nanowires@Carbon‐Fibers Based Wire‐Supercapacitors for Wearable Electronics

Cited by 74 publications

References 50 publications

A Wearable Second Skin‐Like Multifunctional Supercapacitor with Vertical Gold Nanowires and Electrochromic Polyaniline

A Wearable Second Skin‐Like Multifunctional Supercapacitor with Vertical Gold Nanowires and Electrochromic Polyaniline

Hollow Polypyrrole Sleeve Based Coaxial Fiber Supercapacitors for Wearable Integrated Photosensing System

Ni-Co Alloy and Multisegmented Ni/Co Nanowire Arrays Modulated in Composition: Structural Characterization and Magnetic Properties

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Meters‐Long Flexible CoNiO₂‐Nanowires@Carbon‐Fibers Based Wire‐Supercapacitors for Wearable Electronics