Waterproof, Ultrahigh Areal‐Capacitance, Wearable Supercapacitor Fabrics

Yang, Yu; Huang, Qiyao; Niu, Liyong; Wang, Dongrui; Yan, Casey; She, Yuanbin; Zheng, Zijian

doi:10.1002/adma.201606679

Cited by 309 publications

(215 citation statements)

References 60 publications

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“…Can the artificial axons function as wearable and washable conductors for active textiles? Many stretchable conductors have been developed to enable wearable active textiles [14][15][16][17][18][19][20] , but making them washable is challenging [21][22][23] . Among recent advances, the technology of silver nanowire/PDMS composite stands out.…”

Section: Introductionmentioning

confidence: 99%

Wearable and Washable Conductors for Active Textiles

Floch

Yao

Liu

et al. 2017

ACS Appl. Mater. Interfaces

123

112

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ABSTRACT:The emergence of stretchable electronics and its potential integration with textiles have highlighted a challenge: textiles are wearable and washable, but electronic devices are not. Many stretchable conductors have been developed to enable wearable active textiles, but little has been done to make them washable. Here we demonstrate a new class of stretchable conductors that can endure wearing and washing conditions commonly associated with textiles.Such a conductor consists of a hydrogel, a dissolved hygroscopic salt, and a butyl rubber coating.The hygroscopic salt enables ionic conduction, and matches the relative humidity of the hydrogel 2 to the average ambient relative humidity. The butyl rubber coating prevents the loss and gain of water due to the daily fluctuation of ambient relative humidity. We develop the chemistry of dip coating the butyl rubber onto the hydrogel, using silanes to achieve both the crosslink of the butyl rubber and the adhesion between the butyl rubber and the hydrogel. We test the endurance of the conductor by soaking it in detergent while stretching it cyclically, and by machinewashing it. The loss of water and salt is minimal. It is hoped that these conductors open applications in healthcare, entertainment, and fashion.3

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Section: Introductionmentioning

confidence: 99%

Wearable and Washable Conductors for Active Textiles

Floch

Yao

Liu

et al. 2017

ACS Appl. Mater. Interfaces

123

112

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“…[32,33] However, the mechanical strength of these micron-sized fibers is not sufficient for weaving or knitted using a textile machine due to the large pore volume. [9] However, these previous works were characterized by the following disadvantages: (1) risk of the active materials detaching from the CC in the MnO 2 @TiN@CC electrode mentioned above, (2) poor properties such as low capacitance and low energy density due to the small surface area (<90 m 2 g −1 ) (3) difficult to integrate to smart/wearable electronics. For example, an allsolid-state symmetric supercapacitor, which exhibited low capacitance and energy density, was assembled using activated carbon cloth by Li and co-workers.…”

Section: Introductionmentioning

confidence: 99%

Flexible and Wearable All‐Solid‐State Supercapacitors with Ultrahigh Energy Density Based on a Carbon Fiber Fabric Electrode

Qin

Peng

Hao

et al. 2017

Advanced Energy Materials

174

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Wearable textile energy storage systems are rapidly growing, but obtaining carbon fiber fabric electrodes with both high capacitances to provide a high energy density and mechanical strength to allow the material to be weaved or knitted into desired devices remains challenging. In this work, N/O‐enriched carbon cloth with a large surface area and the desired pore volume is fabricated. An electrochemical oxidation method is used to modify the surface chemistry through incorporation of electrochemical active functional groups to the carbon surface and to further increase the specific surface area and the pore volume of the carbon cloth. The resulting carbon cloth electrode presents excellent electrochemical properties, including ultrahigh areal capacitance with good rate ability and cycling stability. Furthermore, the fabricated symmetric supercapacitors with a 2 V stable voltage window deliver ultrahigh energy densities (6.8 mW h cm−3 for fiber‐shaped samples and 9.4 mW h cm−3 for fabric samples) and exhibit excellent flexibility. The fabric supercapacitors are further tested in a belt‐shaped device as a watchband to power an electronic watch for ≈9 h, in a heart‐shaped logo to supply power for ≈1 h and in a safety light that functions for ≈1 h, indicating various promising applications of these supercapacitors.

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“…[33,41,42] The galvanostatic charge/discharge curves in Figure 3C indicate high areal capacitance of 1150 mF cm −2 at a current density of 5 mA cm −2 ( Figure 3C,ii). [44,45] In order to assemble a complete AMSC, preparation of the anode through electrodeposition of a mixture of PPy and rGO was carried out (Figure 4). Indeed, the pronounced capacitance retention at high current density, which translates to high charge/discharge rate, is on par or greater than previously reported thin electrodes.…”

Section: Fabrication Of Electrodes For An Asymmetric Microsupercapacimentioning

confidence: 99%

Flexible Asymmetric Microsupercapacitors from Freestanding Hollow Nickel Microfiber Electrodes

Morag

Jelinek

2018

Adv Elect Materials

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The increasing demand for flexible and wearable microelectronics is a major driving force for the development of high‐performance small‐volume energy sources. Microsupercapacitors exhibit significant potential in energy storage as they provide high power and good cycle stability. Yet, most microsupercapacitors display low energy densities limiting their practical use in microelectronics. Here, synthesis of high surface area freestanding electrodes comprising hollow nickel microfibers is demonstrated. The microfiber nickel electrodes constitute a platform for flexible asymmetric microsupercapacitors exhibiting excellent mechanical resilience as well as high energy density (0.11 mWh cm−2) and power density (37.5 mW cm−2). The freestanding nature and extensive surface area of the electrodes contribute to pronounced areal and volumetric capacitance, energy storage values, and stability after numerous (hundreds) physical bending cycles. The simple preparation scheme and use of an inexpensive building block (e.g., nickel) underscore potential uses as light and flexible energy storage devices.

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Waterproof, Ultrahigh Areal‐Capacitance, Wearable Supercapacitor Fabrics

Cited by 309 publications

References 60 publications

Wearable and Washable Conductors for Active Textiles

Wearable and Washable Conductors for Active Textiles

Flexible and Wearable All‐Solid‐State Supercapacitors with Ultrahigh Energy Density Based on a Carbon Fiber Fabric Electrode

Flexible Asymmetric Microsupercapacitors from Freestanding Hollow Nickel Microfiber Electrodes

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