Large-area (64 cm2), semi-transparent, flexible all-solid-state supercapacitor using D-bar coating process

Ovhal, Manoj Mayaji; Kumar, Neetesh; Lim, Sooman; Kang, Jae‐Wook

doi:10.1016/j.apsusc.2020.147072

Cited by 15 publications

(13 citation statements)

References 32 publications

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“…The measured energy and power densities of the supercapacitor are 0.453 μWh/cm 2 and 26.5 mW/cm 2 . These values are better or comparable with the previously published PEDOT:PSS-based wearable supercapacitors, for example, RuO 2 /PEDOT:PSS spray-coated thin electrode (0.053 μWh/cm 2 , 0.147 mW/cm 2 ), PEDOT:PSS coated on cloth (0.074 μWh/cm 2 , 0.031 mW/cm 2 ), PEDOT:PSS fibers (4.13 μWh/cm 2 , 0.25 mW/cm 2 ), and other related devices are given for comparison in a Ragone plot − (Figure ). The Ragone plot reveals that when the thickness is controlled, our technique brings the advantages of high power density with an area control on the device with the up-scalability property.…”

Section: Resultssupporting

confidence: 89%

Scalable Paper Supercapacitors for Printed Wearable Electronics

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Brett

Edberg

et al. 2022

ACS Appl. Mater. Interfaces

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Printed paper-based electronics offers solutions to rising energy concerns by supplying flexible, environmentally friendly, low-cost infrastructure for portable and wearable electronics. Herein, we demonstrate a scalable spray-coating approach to fabricate tailored paper poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS)/cellulose nanofibril (CNF) electrodes for all-printed supercapacitors. Layer-by-layer spray deposition was used to achieve high-quality electrodes with optimized electrode thickness. The morphology of these electrodes was analyzed using advanced X-ray scattering methods, revealing that spray-coated electrodes have smaller agglomerations, resulting in a homogeneous film, ultimately suggesting a better electrode manufacturing method than drop-casting. The printed paper-based supercapacitors exhibit an areal capacitance of 9.1 mF/cm 2 , which provides enough energy to power electrochromic indicators. The measured equivalent series resistance (ESR) is as low as 0.3 Ω, due to improved contact and homogeneous electrodes. In addition, a demonstrator in the form of a self-powered wearable wristband is shown, where a largearea (90 cm 2 ) supercapacitor is integrated with a flexible solar cell and charged by ambient indoor light. This demonstration shows the tremendous potential for sequential coating/printing methods in the scaling up of printed wearables and self-sustaining systems.

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Section: Resultssupporting

confidence: 89%

Scalable Paper Supercapacitors for Printed Wearable Electronics

Say

Brett

Edberg

et al. 2022

ACS Appl. Mater. Interfaces

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“…This result suggests that the SF-SC device based on ME-TCE possessed a higher rate capability. [35,36] The noticeably higher C a in the ME-TCE-based device relative to the PEDOT:PSS-based device arises primarily from the IR-drop, which is caused by the linear resistance. [37] For instance, the IRdrops in devices based on PEDOT:PSS and ME-TCE were 0.35 and 0.07 V, respectively; this confirms that the latter device has a lower internal resistance.…”

Section: Resultsmentioning

confidence: 99%

Scalable, All‐Printed Photocapacitor Fibers and Modules based on Metal‐Embedded Flexible Transparent Conductive Electrodes for Self‐Charging Wearable Applications

Jin

Ovhal

Lee

et al. 2020

Advanced Energy Materials

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of a lightweight, flexible, self-charging device with stable and sustainable power output. To tackle this issue, researchers are committed to assembling a flexible, uninterruptible, self-charging system by integrating various flexible energy-harvesting and energy-storage devices, giving rise to novel photocapacitor-integrated devices. Individually, the device application of flexible, fabric/stripe-type photovoltaic (PV) cells and supercapacitors in futuristic textile circuits has been extensively explored. These fiber/stripe-based devices can be easily integrated and woven together into garments with orderly patterns, such as stripes or mosaics, without compromising the wearing comfort and aesthetic design of the garment itself. [5-7] For flexible energy-harvesting devices, researchers have developed highly efficient and flexible PV cells, such as dyesensitized, [5] organic, [8] and perovskite [9] solar cells, which are environmentally benign. Compared to dye-sensitized and perovskite solar cells, organic solar cells (OSCs) exhibit superior device flexibility and higher power conversion efficiency (PCE) retention under extreme mechanical deformation/ distortion. They have these benefits because they are based on organic polymers, which are non-brittle in nature. Additionally, OSCs are low-cost, printable, reproducible, and lightweight, rendering them compatible with futuristic wearable textile applications. [1,3,5,10-13] However, conventional film-based OSCs exhibit flexibility only in a direction perpendicular to the film and are not compatible with the weaving process for wearable electronic applications. By virtue of their diverse fabrication techniques and structural designs, the dimensions of flexible OSC devices can be tuned from 2D (film) to 1D (fibers/stripes) by further scaling down the y-axis of the conventional film-based device. 1D fiber/ stripe-shaped devices that are fully compatible with the weaving process can then be obtained. Stripe-shaped OSCs have inherent advantages over planar OSCs, such as incredibly high mechanical flexibility, which means they can conform to arbitrary shapes like the human body. [14] Furthermore, after the weaving process, the relative shadowed active area is less for stripe-shaped device structures as compared with fiber-shaped geometries. On another note, flexible supercapacitors (F-SCs) have been used as energy storage systems in futuristic smart electronics The popularity of wearable smart electronic gadgets, such as smartphones, smartwatches, and medical sensors, is inhibited by their limited operation lifetime due to the lack of a sustainable self-charging power supply. This constraint can be overcome by developing a flexible, self-charging photocapacitor that can synchronously harvest and store energy. Here, ultrathin, all-printed, and metal-embedded transparent conducting electrodes (ME-TCEs) are designed for the fabrication of large-area, flexible organic solar cells (F-OSCs) and flexible supercapacitors (F-SCs). Stripe-shaped F-OSCs (SF-OSCs) and F-SCs (SF-SCs) ...

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“…Among these, solution processing is intricately related to the crystallization and orientation of the film, which are important factors in functional device applications; hence, this process is appropriate for fabricating high-performance LC devices; − this approach is also cost-effective, is easily controlled, and has low-temperature processing properties compared with other methods. Solution processing includes the spin-coating, bar-coating, blade-coating, dip-coating, and brush-coating − methods. Specifically, the brush-coating method can help control the directionality of the liquid material used in the process by shearing the solution and orienting the particles successfully; thus, it assists in the formation of oriented micro/nanostructures on the coated surfaces.…”

Section: Introductionmentioning

confidence: 99%

Oriented Yttrium Strontium Tin Oxide Micro/Nanostructures Induced by Brush Coating for Low-Voltage Liquid Crystal Systems

Lee

Kim

Heo

et al. 2022

ACS Appl. Nano Mater.

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We present a convenient liquid crystal (LC) alignment method using brush hairs. An yttrium strontium tin oxide (YSrSnO) solution was prepared using a sol–gel process, and the one-step brush-coating process integrated film deposition and alignment. X-ray photoelectron spectroscopy confirmed a well-formed YSrSnO film via thermal oxidation. Atomic force microscopy showed oriented micro/nanostructures of the brush-coated film, attributed to shearing stress from brush-hair movements on the coating surface; the directionality was identical to that of the brushed coating, which caused physical surface anisotropy and uniform LC alignment on the YSrSnO layer. Uniform and homogeneous LC alignment was confirmed by polarized optical microscopy and pretilt angle measurements. Thermal stability tests of the LCs showed a suitable thermal budget, and the YSrSnO film showed fine optical transparency. Excellent electro-optical properties were observed in twisted-nematic LC system with remarkable low operating voltage. Thus, we expect brush coating to be a viable next-generation technology for LC systems.

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Large-area (64 cm2), semi-transparent, flexible all-solid-state supercapacitor using D-bar coating process

Cited by 15 publications

References 32 publications

Scalable Paper Supercapacitors for Printed Wearable Electronics

Scalable Paper Supercapacitors for Printed Wearable Electronics

Scalable, All‐Printed Photocapacitor Fibers and Modules based on Metal‐Embedded Flexible Transparent Conductive Electrodes for Self‐Charging Wearable Applications

Oriented Yttrium Strontium Tin Oxide Micro/Nanostructures Induced by Brush Coating for Low-Voltage Liquid Crystal Systems

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