Biomolecule based fiber supercapacitor for implantable device

Sim, Hyeon Jun,Choi, Changsoon,Lee, Dong Yeop,Kim, Hyunsoo,Yun, Ji-Hyun,Kim, Jung Min,Kang, Tong Mook,Ovalle, Raquel,Baughman, Ray H.,Kee, Chang Won,Kim, Seon Jeong Elsevier 2018 Nano energy Vol.47 No.-

<P><B>Abstract</B></P> <P>With the growing demand for electronic medical devices for healthcare applications, we studied an implantable supercapacitor that can operate in an implantable electronic device. Here, we report a flexible implantable fiber supercapacitor for an in vivo energy storage device. The fiber supercapacitor has a high flexibility and a high potential to be applied in an implant device because the fiber can be implanted in the blood vessel and the wound can be stitched with the fiber-like suture. The fiber electrodes were fabricated in a biscrolling process that trapped poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/ferritin nanoclusters within multiwalled carbon nanotube (MWNT) sheets that provide mechanical strength and electrical conductivity. In addition, the supercapacitor is biocompatible because the MWNT sheets are coated with biocompatible materials such as PEDOT:PSS and ferritin. The areal capacitance of the PEDOT:PSS/ferritin/MWNT fiber supercapacitor was 32.9 mF/cm<SUP>2</SUP> in a phosphate buffered saline solution, and the areal energy density was 0.82 μWh/cm<SUP>2</SUP>; these values are 52 times higher than that of the guest-free MWNT yarn. The supercapacitor operated well in a mouse and exhibited excellent biocompatibility; the capacitance was maintained above 90% in the mouse after eight days.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Abdominal muscle of the mouse was stitched with the micro-diameter fiber supercapacitor like suture. </LI> <LI> The flexible fiber supercapacitor performance was maintained above 90% in the mouse after eight days. </LI> <LI> The PEDOT:PSS/ferritin nanocluster was enhancing the areal capacitance by the synergistic effect. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>The fiber supercapacitor has a high flexibility and a high potential to be applied in an implant device because the fiber can be implanted in the blood vessel and the wound can be stitched with the fiber-like suture. The supercapacitor operated well in a mouse and exhibited excellent biocompatibility.</P> <P>[DISPLAY OMISSION]</P>

Flexible, Swiss roll, fiber-shaped, asymmetric supercapacitor using MnO₂ and Fe₂O₃ on carbon fibers

Cho, Sungdong,Patil, Bebi,Yu, Seongil,Ahn, Suhyun,Hwang, Jeonguk,Park, Changyong,Do, Kwanghyun,Ahn, Heejoon Elsevier 2018 ELECTROCHIMICA ACTA Vol.269 No.-

<P><B>Abstract</B></P> <P>We report a successful demonstration of a Swiss roll, fiber-shaped, asymmetric supercapacitor (FSASC) fabricated with MnO<SUB>2</SUB> as a positive electrode and Fe<SUB>2</SUB>O<SUB>3</SUB> as a negative electrode, both on carbon fibers as the current collector, with a high operating voltage of 2.0 V. The suggested Swiss roll FSASC device exhibited a high gravimetric energy density of 33.1 Wh kg<SUP>−1</SUP> and a volumetric energy density of 0.16 mWh cm<SUP>−3</SUP>, with excellent rate capability, cycling stability, and coulombic efficiency. Additionally, the Swiss roll FSASC showed great durability and flexibility under mechanical stress. The promising performance of the Swiss roll FSASC suggests its potential for applications in wearable and flexible energy storage devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A Swiss roll, fiber-shaped, asymmetric supercapacitor (FSASC) was fabricated via a facile method. </LI> <LI> MnO<SUB>2</SUB>/CFs and Fe<SUB>2</SUB>O<SUB>3</SUB>/CFs were used as the positive and negative electrodes, respectively, in the designed supercapacitor. </LI> <LI> The Swiss roll FSASC showed a high gravimetric energy density of 33.1 Wh kg<SUP>−1</SUP>. </LI> <LI> The Swiss roll FSASC exhibited good rate capability, long cycle life, and excellent flexibility. </LI> <LI> The Swiss roll FSASC maintained electrochemical stability under repeated mechanical stresses. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>A Swiss roll, fiber-shaped, asymmetric supercapacitor (FSASC) was successfully fabricated by simply rolling an Fe<SUB>2</SUB>O<SUB>3</SUB>/CF negative electrode and a MnO<SUB>2</SUB>/CF positive electrode with PVA-LiClO<SUB>4</SUB> gel electrolyte. This Swiss roll FSASC can be operated in large potential windows up to 2.0 V and shows excellent rate capability, cycling stability, and device flexibility.</P> <P>[DISPLAY OMISSION]</P>

High performance asymmetric supercapacitor twisted from carbon fiber/MnO₂ and carbon fiber/MoO₃

Noh, Jungchul,Yoon, Chang-Min,Kim, Yun Ki,Jang, Jyongsik Elsevier 2017 Carbon Vol.116 No.-

<P>Fiber-shaped supercapacitors are promising energy storage devices for future flexible and portable electronics. In this study, we report a fiber-shaped asymmetric supercapacitor (ASC) device made with the metal oxides having a large work function difference, directly grown on a flexible and conductive carbon fiber (CF) substrate. Specifically, carbon fiber/MnO2 (CF/MnO2) and carbon fiber/MoO3 (CF/MoO3) were fabricated using a simple electrodeposition method. The all-solid-state fiber-shaped ASC device was then assembled with CF/MnO2 as the positive electrode and CF/MoO3 as the negative electrode. The large work function difference between the metal oxides and the high conductivity of the CF substrate provided the ASC device with remarkable performance. In particular, it exhibited capacitance of 4.86 mF cm(-2) and a wide operating voltage window of 2.0 V, which resulted in an excellent energy density of 2.70 mu Wh cm(-2) and a power density of 0.53 mW cm(-2). Also, it readily tolerated 3000 cycles of electrochemical testing and extreme mechanical deformation. Consequently, the outstanding performance and stability of the fiber-shaped ASC device shows great potential for future energy storage systems. (C) 2017 Elsevier Ltd. All rights reserved.</P>

Flexible, fiber-shaped supercapacitors with roll-type assembly

Yu, Seongil,Patil, Bebi,Ahn, Heejoon THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2019 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.71 No.-

<P><B>Abstract</B></P> <P>A fiber-shaped supercapacitor (FSC) with a unique roll-type configuration is developed by simply rolling polyaniline-coated carbon fiber bundle electrodes with an H<SUB>2</SUB>SO<SUB>4</SUB>/polyvinyl alcohol gel electrolyte. The roll-type polyaniline-coated carbon fibers FSC exhibits four times higher capacitance retention than the twist-type fiber-shaped supercapacitor and shows an energy density of 2.97Whkg<SUP>−1</SUP> at a power density of 4kWkg<SUP>−1</SUP>, which is almost three orders of magnitude higher than that of the twist-type FSC (0.004Whkg<SUP>−1</SUP>). The enhanced performance of the roll-type FSC is attributable to its unique roll-type configuration, which creates a short and consistent distance between the electrodes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new roll-type configuration was designed for fiber-shaped supercapacitors (FSCs). </LI> <LI> The roll-type configuration maintains a short distance between the electrodes. </LI> <LI> The roll-type FSC was simply fabricated by roll-up assembly. </LI> <LI> The PANI/CF roll-type FSC exhibited high capacitance retention. </LI> <LI> The roll-type FSC showed excellent mechanical stability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>A fiber-shaped supercapacitor (FSC) with a unique roll-type configuration was developed by simply rolling up PANI-coated carbon fiber bundle electrodes and using a PVA–H<SUB>2</SUB>SO<SUB>4</SUB> gel electrolyte. The PANI/CF roll-type FSC exhibited better electrochemical performance than the PANI/CF twist-type FSC.</P> <P>[DISPLAY OMISSION]</P>

Electrochemical performance of a coaxial fiber-shaped asymmetric supercapacitor based on nanostructured MnO₂/CNT-web paper and Fe₂O₃/carbon fiber electrodes

Patil, Bebi,Ahn, Suhyun,Yu, Seongil,Song, Hyeonjun,Jeong, Youngjin,Kim, Ju Hwan,Ahn, Heejoon Elsevier 2018 Carbon Vol.134 No.-

<P><B>Abstract</B></P> <P>The fiber-shaped supercapacitor is a promising energy storage device in wearable and portable electronics because of its high flexibility, small size, and light weight. However, most of the reported fiber-shaped supercapacitors have exhibited low capacitance and energy density due to the limited surface area between the two fiber electrodes and operating voltage range. Herein, we successfully developed a coaxial fiber-shaped asymmetric supercapacitor (CFASC) made from MnO<SUB>2</SUB>/CNT-web paper as a cathode coupled with Fe<SUB>2</SUB>O<SUB>3</SUB>/carbon fiber as an anode with a high operating voltage of 2.2 V. The prepared CFASC device showed a high volumetric energy density of 0.43 mWh cm<SUP>−3</SUP> at a power density of 0.02 W cm<SUP>−3</SUP>, which is comparable to those of previously reported fiber-shaped supercapacitors. Additionally, CFASC exhibited good rate capability, long cycle life, and high volumetric capacitance (0.67 F cm<SUP>−3</SUP>) with excellent flexibility. The promising performance of CFASC illustrated its potential for portable and wearable energy storage devices.</P> <P><B>Graphical abstract</B></P> <P>The coaxial fiber-shaped asymmetric supercapacitor (CFASC) was successfully developed by simply wrapping the Fe<SUB>2</SUB>O<SUB>3</SUB>/CFs negative electrode with the PVA-LiClO<SUB>4</SUB> gel electrolyte-coated MnO<SUB>2</SUB>/CNT-web paper positive electrode. This CFASC can be operated at large potential windows up to 2.2 V, resulting in high specific energy, and showed excellent cycling stability and device flexibility.</P> <P>[DISPLAY OMISSION]</P>

Influence on activation temperature of pitch-based microporous carbon fibers by steam for anode electrode in supercapacitors

조은아,박수진 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0

In this work, we studied the electrochemical behaviors of the pitch-based microporous carbon fibers prepared by steam activation at different temperatures. The elemental composition of the surface of the activated carbon fibers was investigated by X-ray photoelectron spectroscopy (XPS). The specific surface area and micropore volumes of the activated carbon fibers were performed using the Brunauer-Emmett-Teller (BET) and Dubinin-Radushkevich (D-R) equation respectively under nitrogen and argon. Electrochemical measurements were estimated in a threeelectrode system using the cyclic voltammetry (CV). The experimental results indicated that the physical activation increased the specific surface area of activated carbon fibers. And the electrochemical performance was considerably enhanced by increase of specific surface area and micropore volumes.

PANI//MoO3 Fiber-shaped Asymmetric Supercapacitors with Rolltype Configuration

Seongil Yu,Bebi Patil,안희준 한국섬유공학회 2020 Fibers and polymers Vol.21 No.3

An asymmetric fiber-shaped supercapacitor (FSC) with roll-type configuration, displaying high power and energydensity characteristics, has been fabricated for energy storage in wearable devices. The positive and negative electrodes of theasymmetric FSC consist of polyaniline (PANI) and MoO3, respectively, and are deposited on a carbon fiber (CF) substrateusing a chemical bath deposition method. A polyvinyl alcohol/H2SO4 gel is used as electrolyte, which also maintains the CFelectrodes in fiber form. The asymmetric PANI//MoO3 roll-type FSC exhibits a wider potential range than its symmetricPANI//PANI counterpart, resulting in higher energy and power densities. The asymmetric PANI//MoO3 roll-type FSC showsan energy density of 67.51 μWh/cm3 with a power density of 59.71 mW/cm3 at a current of 10 mA, which is more than twicethe energy density of symmetric PANI//PANI roll-type FSC (30.42 μWh/cm3 and 25.12 mW/cm3).

Electrochemical performance of pitch-based activated carbon fibers for anode electrode in supercapacitors

조은아,박수진 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1

In this work, we studied the electrochemical performance of the pitchbased activated carbon fibers prepared by steam activation at different temperatures. The elemental composition of the surface of the activated carbon fibers was characterized by X-ray photoelectron spectroscopy (XPS). The specific surface area and micropore volumes of the activated carbon fibers were investigated using the Brunauer-Emmett-Teller (BET) and Dubinin-Radushkevich (D-R) equation respectively under nitrogen and argon. Electrochemical measurements were performed in a threeelectrode system using the cyclic voltammetry (CV). The experimental results indicated that the physical activation increased the specific surface area of activated carbon fibers. And the electrochemical performance was considerably enhanced by increase of specific surface area and micropore volumes.

웨어러블 응용을 위한 섬유형 슈퍼커패시터

이재명 ( Jae Myeong Lee ),손원경 ( Wonkyeong Son ),김주완 ( Juwan Kim ),노준호 ( Jun Ho Noh ),오명은 ( Myoungeun Oh ),최진형 ( Jin Hyeong Choi ),최창순 ( Changsoon Choi ) 한국전기전자재료학회 2023 전기전자재료학회논문지 Vol.36 No.4

Flexible fiber- or yarn-based one-dimensional (1-D) energy storage devices are essential for developing wearable electronics and have thus attracted considerable attention in various fields including ubiquitous healthcare (U-healthcare) systems and textile platforms. 1-D supercapacitors (SCs), in particular, are recognized as one of the most promising candidates to power wearable electronics due to their unique energy storage and high adaptability for the human body. They can be woven into textiles or effectively designed into diverse architectures for practical use in day-to-day life. This review summarizes recent important development and advances in fiber-based supercapacitors, concerning the active materials, fiber configuration, and applications. Active materials intended to enhance energy storage capability including carbon nanomaterials, metal oxides, and conductive polymers, are first discussed. With their loading methods for fiber electrodes, a summary of the four main types of fiber SCs (e.g., coil, supercoil, buckle, and hybrid structures) is then provided, followed by demonstrations of some practical applications including wearability and power supplies. Finally, the current challenges and perspectives in this field are made for future works.

Porous Graphene-Carbon Nanotube Scaffolds for Fiber Supercapacitors

Park, Hun,Ambade, Rohan B.,Noh, Sung Hyun,Eom, Wonsik,Koh, Ki Hwan,Ambade, Swapnil B.,Lee, Won Jun,Kim, Seong Hun,Han, Tae Hee American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.9

<P>Fiber nanomaterials can become fundamental devices that can be woven into smart textiles, for example, miniaturized fiber-based supercapacitors (FSCs). They can be utilized for portable, wearable electronics and energy storage devices, which are highly prospective areas of research in the future. Herein, we developed porous carbon nanotube-graphene hybrid fibers (CNT-GFs) for all-solid-state symmetric FSCs, which were assembled through wet-spinning followed by a hydrothermal activation process using environmentally benign chemicals (i.e., H<SUB>2</SUB>O<SUB>2</SUB> and NH<SUB>4</SUB>OH in deionized water). The barriers that limited effective ion accessibility in GFs were overcome by the intercalation of CNTs in the GFs which enhanced their electrical conductivity and mechanical properties as well. The all-solid-state symmetric FSCs of a precisely controlled activated hybrid fiber (a-CNT-GF) electrode exhibited an enhanced volumetric capacitance of 60.75 F cm<SUP>-3</SUP> compared with those of a pristine CNT-GF electrode (19.80 F cm<SUP>-3</SUP>). They also showed a volumetric energy density (4.83 mWh cm<SUP>-3</SUP>) roughly 3 times higher than that of untreated CNT-GFs (1.50 mWh cm<SUP>-3</SUP>). The excellent mechanical flexibility and structural stability of a miniaturized a-CNT-GF are highlighted by the demonstration of negligible differences in capacitance upon bending and twisting. The mechanism of developing porous, large-scale, low-cost electrodes using an environmentally benign activation method presented in this work provides a promising route for designing a new generation of wearable, portable miniaturized energy storage devices.</P> [FIG OMISSION]</BR>