• Title/Summary/Keyword: Hybrid supercapacitor

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Preparation of Three-Dimensional Graphene/Metal Oxide Nanocomposites for Application of Supercapacitors (슈퍼커패시터 응용을 위한 3차원 그래핀/금속 산화물 나노복합체 제조)

  • Kim, Jung Won;Choi, Bong Gill
    • Applied Chemistry for Engineering
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    • v.26 no.5
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    • pp.521-525
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    • 2015
  • Graphene-based electrode materials have been widely explored for supercapacitor applications due to their unique two-dimensional structure and properties. In particular, Three-dimensional (3D) graphene materials are of great importance for preparing electrode materials because they can provide large surface area, efficient and rapid electron and ion transfer, and mechanical stability. Recently, a number of 3D hybrid architecture of graphene/metal oxides have been developed to increase simultaneously energy and power densities of supercapacitors. This review presents the recent progress of 3D nanocomposites based on graphene and metal oxides. Preparation methods and structures of these 3D nanocomposites and their great potential in supercapacitor applications have been summarized.

Effect of Hydrogen in Rapid Thermal Annealing on the Graphene-Zinc Oxide Electrode for Supercapacitor (슈퍼커패시터용 그래핀-산화아연 전극의 급속열처리에서 수소의 영향)

  • Jeong, Woo-Jun;Oh, Ye-Chan;Kim, Sang-Ho
    • Journal of the Korean institute of surface engineering
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    • v.52 no.3
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    • pp.123-129
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    • 2019
  • With recent demand for the renewable energy resources, we conducted a research on the energy conversion and storage device of supercapacitor. The hybrid graphene-zinc oxide(GZO) electrodes for the supercapacitors (SCs) were fabricated and investigated. To increase the electrical conductivity of the GZO electrode, the rapid thermal annealing(RTA) in $Ar/H_2$(10%) atmosphere was applied and the effect was examined by comparing it with RTA at Ar atmosphere. In Raman spectroscopy, the electrodes annealed at 400? in $Ar/H_2$ atmosphere showed a lower ratio of D/G peak than that of annealed at Ar atmosphere, and had a larger specific capacitance(Sc) in the cyclic voltammetry(CV), and a lower the equivalent series resistance(ESR) in the electrochemical impedance spectroscopy(EIS). The reason seems to come from the better mixing of the graphene and zinc oxide by the RTA in $Ar/H_2$(10%).

Graphene Oxide as a Novel Nanoplatform for Direct Hybridization of Graphene-SnO2

  • Park, Hun;Han, Tae Hee
    • Bulletin of the Korean Chemical Society
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    • v.34 no.11
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    • pp.3269-3273
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    • 2013
  • Graphene oxide (GO) has been of particular interest because it provides unique properties due to its high surface area, chemical functionality and ease of mass production. GO is produced by chemical exfoliation of graphite and is decorated with oxygen-containing groups such as phenol hydroxyl, epoxide groups and ionizable carboxylic acid groups. Due to the presence of those functional groups, GO can be utilized as a novel platform for hybrid nanocomposites in chemical synthetic approaches. In this work, GO-$SnO_2$ nanocomposites have been prepared through the spontaneous formation of molecular hybrids. When $SnO_2$ precursor solution and GO suspension were simply mixed, $Sn^{2+}$ was spontaneously formed into $SnO_2$ nanoparticles upon the deoxygenation of GO. Through further chemical reduction by adding hydrazine, reduced GO-$SnO_2$ hybrid was finally created. Our investigation for the electrocapacitive properties of hybrid electrode showed the enhanced performance (389 F/g), compared with rGO-only electrode (241 F/g). Our approach offers a scalable, robust synthetic route to prepare graphene-based nanocomposites for supercapacitor electrode via spontaneous hybridization.

Effect of Edge-Chemistry on Graphene-Based Hybrid Electrode Materials for Energy Storage Device

  • Hyo-Young Kim;Ji-Woo Park;Seo Jeong Yoon;In-Yup Jeon;Young-Wan Ju
    • Journal of Electrochemical Science and Technology
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    • v.14 no.1
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    • pp.31-37
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    • 2023
  • Owing to the rapid climate change, a high-performance energy storage system (ESS) for efficient energy consumption has been receiving considerable attention. ESS, such as capacitors, usually has issues with the ion diffusion of electrode materials, resulting in a decrease in their capacitance. Notably, appropriate pore diameter and large specific surface area (SSA) may result in an effective ion diffusion. Therefore, graphene and multi-walled carbon nanotube (graphene@MWCNT) hybrid nanomaterials, with covalent bonds between the graphene and MWCNT, were prepared via an edge-chemistry reaction. The properties of these materials, such as high porosity, large SSA, and high electroconductivity, make them suitable to be used as electrode materials for capacitors. The optimal ratio of graphene to MWCNT can affect the electrochemical performance of the electrode material based on its physical and electrochemical properties. The supercapacitor using optimal graphene-based hybrid electrode material exhibited highest specific capacitance value as 158 F/g and excellent cycle stability.

Elucidating Electrochemical Energy Storage Performance of Unary, Binary, and Ternary Transition Metal Phosphates and their Composites with Carbonaceous Materials for Supercapacitor Applications

  • Muhammad Ramzan Abdul Karim;Waseem Shehzad;Khurram Imran Khan;Ehsan Ul Haq;Yousaf Haroon
    • Journal of Electrochemical Science and Technology
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    • v.15 no.3
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    • pp.321-344
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    • 2024
  • Transition metal compounds (TMCs) are being researched as promising electrode materials for electrochemical energy storage devices (supercapacitors). Among TMCs, transition metal phosphates (TMPs) have good, layered structures owing to open framework and protonic exchange capability among different layers, good surface area due to engrossed porosity, rich active redox reaction sites owing to octahedral structure and variable valance metallic ions. Hence TMPs become more ideal for supercapacitor electrode materials compared to other TMCs. However, TMPs have got some issues like low conductivity, rate performance, stability, energy, and power densities. But these problems can be addressed by making their composites with carbonaceous materials, e.g., carbon nanotubes (CNTs), graphene oxide (GO), graphitic carbon (GC), etc. A few factors like high surface area, excellent electrical conductivity of carbon materials and variable valence metal ions in TMPs caused great enhancement in their electrochemical performance. This article tries to discuss and compare the published data, majorly in last decade, regarding the electrochemical energy storage potential of pristine unary, binary, and ternary TMPs and their hybrid composites with carbonaceous materials (CNTs, GOs/rGOs, GC, etc.). The electrochemical performance of the hybrids has been reported to be higher than the pristine counterparts. It is hoped that the current review will open a new gateway to study and explore the high performance TMPs based supercapacitor materials.

Modeling and Operation of Hybrid Energy System with Supercapacitor Bank and PV System (PV와 슈퍼캐패시터 하이브리드에너지시스템 모델 및 제어.운영기술)

  • Cho, Jea-Hoon;Hong, Won-Pyo
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2009.10a
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    • pp.291-295
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    • 2009
  • Economic and environmental concerns over fossil fuels encourage the development of photovoltaic(PV) energy systems. Due to the intermittent nature of solar energy. energy storage is needed in a stand-alone PV system for the purpose of ensuring continuous power flow. Grid-connected PV system that supply power in a critical load demand require to curb power fluctuation. In this case. SCB is a effectiveness in controlling power variation due to intrinsic PV system. We propose the Matlab/Simulink dynamic model and power flow characteristics of a hybrid energy system with PV and SCB.

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Improve the performance of 360V-class super-capacitors module through cell monitoring and active cell balancing (360V급 회생제동용 슈퍼캐패시터 모듈의 셀모니터링과 액티브 밸렌싱을 통한 성능개선)

  • Lee, Hee-Bum;Kim, Young-Kil
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2011.05a
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    • pp.83-86
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    • 2011
  • 최근 에너지/환경의 문제로 HEV(Hybrid Electric Vehicle)이 대두되고 있는데, HEV를 위한 대표적인 기술로서 제동시 에너지로 발전하여 전기를 회수하는 회생제동이 있다. 회생제동기술은 HEV 뿐만 아니라 건설기기, 하이브리드 버스, 전철, 엘리베이터 등에 폭넓게 활용이 가능하다. 회생제동용 에너지 저장원으로서는 고출력 및 환경특성이 우수한 슈퍼캐패시터가 적합하며, 단일 셀이 아닌 수십 ~ 수백 개의 셀이 모듈로 사용되는 만큼, 모듈화 설계 기술이 필요 하다. 수백 개의 셀을 모듈화하기 위해서 개별 셀의 전압을 모니터링 하는 기술과 충방전 시 밸렌싱 하는 기술, 사용환경에 따라 열 관리 기술이 필요하며, 이들 기능을 수행할 수 있는 통합 시스템을 구비하여 안정성과 성능 향상을 하고자 한다.

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Electrochemical Behavior Depending on Designed-Anode and Cathodes of Hybrid Supercapacitors (하이브리드 슈퍼커패시터의 음극 및 양극 설계에 따른 전기화학적 거동)

  • Shin, Seung-Il;Lee, Byung-Gwan;Ha, Min-Woo;An, Geon-Hyoung
    • Korean Journal of Materials Research
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    • v.29 no.12
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    • pp.774-780
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    • 2019
  • The performance of Li-ion hybrid supercapacitors (asymmetric-type) depends on many factors such as the capacity ratio, material properties, cell designs and operating conditions. Among these, in consideration of balanced electrochemical reactions, the capacity ratio of the negative (anode) to positive (cathode) electrode is one of the most important factors to design the Li-ion hybrid supercapacitors for high energy storing performance. We assemble Li-ion hybrid supercapacitors using activated carbon (AC) as anode material, lithium manganese oxide as cathode material, and organic electrolyte (1 mol L-1 LiPF6 in acetonitrile). At this point, the thickness of the anode electrode is controlled at 160, 200, and 240 ㎛. Also, thickness of cathode electrode is fixed at 60 ㎛. Then, the effect of negative and positive electrode ratio on the electrochemical performance of AC/LiMn2O4 Li-ion hybrid supercapacitors is investigated, especially in the terms of capacity and cyclability at high current density. In this study, we demonstrate the relationship of capacity ratio between anode and cathode electrode, and the excellent electrochemical performance of AC/LiMn2O4 Li-ion hybrid supercapacitors. The remarkable capability of these materials proves that manipulation of the capacity ratio is a promising technology for high-performance Li-ion hybrid supercapacitors.

Electrochemical Characteristics of Supercapacitor Electrode Using MnO2 Electrodeposited Carbon Nanofiber Mats from Lignin-g-PAN Copolymer (이산화망간 전기증착 리그닌 기반 탄소나노섬유 매트를 이용한 슈퍼캐퍼시터용 전극소재의 전기·화학적 특성)

  • Kim, Seok Ju;Youe, Won-Jae;Kim, Yong Sik
    • Journal of the Korean Wood Science and Technology
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    • v.44 no.5
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    • pp.750-759
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    • 2016
  • The $MnO_2$ electrodeposited on the surface of the carbon nanofiber mats ($MnO_2$-LCNFM) were prepared from electrospun lignin-g-PAN copolymer via heat treatments and subsequent $MnO_2$ electrodeposition method. The resulting $MnO_2$-LCNFM was evaluateed for its potential use in a supercapicitor electrode. The increase of $MnO_2$ electric deposition time was revealed to increase diameter of carbon nanofibers as well as $MnO_2$ content on the surface of carbon nanofiber mats as confirmed by scanning electon microscope (SEM) analysis. The electrochemical properties of $MnO_2$-LCNFM electrodes are evaluated through cyclic voltammetry test. It was shown that $MnO_2$-LCNFM electrode exhibited good electrochemical performance with specific capacitance of $168.0mF{\cdot}cm^{-2}$. The $MnO_2$-LCNFM supercapacitor successfully fabricated using the gel electrolyte ($H_3PO_4$/Polyvinyl alcohol) showed to have the capacitance efficiency of ~90%, and stable behavior during 1,000 charging/discharging cycles.