• 제목/요약/키워드: hybrid electrolyte

검색결과 105건 처리시간 0.025초

ORGANIC - INORGANIC COMPOSITE MEMBRANE FOR POLYMER ELECTROLYTE MEMBRANE FUEL CELL

  • Shul, Yong-Gun;Kim, Hyun-Jong;Ahn, Ji-Eun;Han, Hak-Soo
    • 한국막학회:학술대회논문집
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    • 한국막학회 2003년도 The 4th Korea-Italy Workshop
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    • pp.37-40
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    • 2003
  • Mesoporous zeolite - heteropolyacid-polymer hybrid membrane was prepared by sol-gel processes to make a proton conducting membrane. The crystallinity of mesoporous zeolite in composite membrane was increased with contents of heteropolyacid. Proton conductivity obtained from impedance measurements increases with contents of heteropolyacid, about 10$^{-3}$ S/cm in ca. 1.5 Wt% heteropolyacid.

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High sensitivity biosensor for mycotoxin detection based on conducting polymer supported electrochemically polymerized biopolymers

  • Dhayal, Marshal;Park, Gye-Choon;Park, Kyung-Hee;Gu, Hal-Bon
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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    • pp.243.1-243.1
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    • 2010
  • Devices based on nanomaterials platforms are emerging as a powerful tool for ultrasensitive sensors for the direct detection of biological and chemical species. In this talk, we will report the preparation and the full characterization of electrochemical polymerization of biopolymers platforms and nano-structure formation for electrochemical detection of enzymatic activity and toxic compound in electrolyte for biosensor applications. Formation of an electroactive polymer film of two different compounds has been quantified by observing new redox peak at higher potentials in cyclic voltammogram measurements. RCT value of at various biopolymer concentration based hybrid films has been obtained from electrochemical impedance spectroscopy analysis and possible mechanism for formation of complexes during electrochemical polymerization on conducting substrates has been investigated. Biosensors developed based on these hybrid biopolymers have very high sensitivity.

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하이브리드커패시터용 활성탄전극의 리튬도핑에 따른 전기화학적 거동

  • 조민영;노광철;이재원;박선민;이동렬;한상진
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2009년도 추계학술대회 논문집
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    • pp.266-266
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    • 2009
  • For the development of hybrid supercapacitor, increasing energy density is one of the most crucial matters. Since the energy density is the function of capacitance and voltage, it is necessary to enhance energy density for increasing capacitance or voltage. For the high working voltage, it was to enforce Li ion free-doping to activated carbon. As a result, initial capacitance has increased by 11% than raw cell. But capacitance has decreased by Li ion re-solution to electrolyte for increase the number of cycle.

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Li-ion batteries, its applications and research trends

  • Lim, Jinsub
    • 한국진공학회:학술대회논문집
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    • 한국진공학회 2015년도 제49회 하계 정기학술대회 초록집
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    • pp.84.2-84.2
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    • 2015
  • Growing market of electric vehicles such as hybrid, plug-in hybrid, and bare electric vehicles in the world is accelerating the significance of Li-ion batteries as a renewable green energy. According to such market flow, the developing components such as cathode, anode, electrolyte, and separator, composing the Li-ion batteries, is significantly important tasks for the commercialization. In particular, development of the cathode material having high capacity and stable thermal stability is essential for long-distance electric vehicle in the near future. Herein we introduce various applications of Li-ion batteries such as portable electronics, electric vehicles, and energy storage system, and also its research trend, in particular on the cathode materials.

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통합 열관리 시스템의 제어를 위한 수소-전기 하이브리드 기반 고정밀 소형 선박 시뮬레이터 모델 개발 (Development of a High-precision Small Ship Simulator Model Based on Hydrogen-electric Hybrid to Control an Integrated Thermal Management System)

  • 안민우;현대일;한재영
    • 한국수소및신에너지학회논문집
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    • 제35권2호
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    • pp.230-239
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    • 2024
  • Efforts are being made to replace ship diesel engines with electric propulsion motors in response to emission regulations. In particular, in the case of short-range small ships, research is being conducted to replace polymer electrolyte membrane fuel cells (PEMFC) with power sources. However, PEMFC has problems such as slow dynamic response characteristics and reduced durability at high temperatures. To solve this problem, a high-precision ship model was developed with power distribution and thermal management strategies applied, and through this, the required power, heat, and power characteristics of the propulsion system according to the ship's speed profile were analyzed.

선박용 연료전지 성능 예측 방법에 관한 고찰 (A Review on Performance Prediction of Marine Fuel Cells )

  • 박은주;이진광
    • 한국수소및신에너지학회논문집
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    • 제35권4호
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    • pp.437-450
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    • 2024
  • Sustainable shipping depends on eco-friendly energy solutions. This paper reviews methods for predicting marine fuel cell performance, including empirical approaches, physical modeling, data-driven techniques, and hybrid methods. Accurate prediction models tailored to the marine environment's unique conditions are crucial for operational efficiency. By evaluating the strengths and weaknesses of each method, this study provides a comprehensive analysis of effective strategies for forecasting polymer electrolyte membrane fuel cell and solid oxide fuel cell performance in marine applications. These insights contribute to the advancement of eco-friendly shipping technologies and enhance fuel cell performance in challenging marine environments.

Highly Efficient Dye-Sensitized Solar Cells with Nonplatinized Graphene Oxide/Metal

  • 전용석;이동욱;김정우;임정민;서승혁;한민수;한치환;신현석;전용석
    • 한국재료학회:학술대회논문집
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    • 한국재료학회 2011년도 추계학술발표대회
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    • pp.11.2-11.2
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    • 2011
  • A key technological issue related to the implementation of dye-sensitized solar cells (DSSCs) is the replacement of Pt at the counter electrodes with an inexpensive and electro-chemically stable alternative. Carbon based nanomaterials could be promising candidates, but in practice they exhibit inadequate device performance. Here, we report very thin graphene oxide (GO)/metal hybrid films as transparent counter electrodes for high-efficiency DSSCs. Transparent GO/Pt and GO/Au hybrid films showed cell efficiencies of 9.2 and 9.0%, respectively (improvements of 9.5 and 7.1% over conventional Pt counter electrodes). More interestingly, highly stable DSSCs with GO hybrid films from relatively inexpensive metals such as Cu and Ni have been demonstrated with efficiency values comparable to Pt counter electrodes. The results reported in this study should enable low-cost fabrication of DSSCs because it allows the use of relatively inexpensive metals such as Au, Cu, Ni, and Ag that could not be previously employed in DSSCs with iodide/tri-iodide electrolyte due to corrosion.

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수직배양된 고집적 CdTe-Si 나노구조체의 제조방법 (Facile Synthesis of Vertically Aligned CdTe-Si Nanostructures with High Density)

  • 임진호;황성환;정현성
    • 한국전기전자재료학회논문지
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    • 제30권3호
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    • pp.185-191
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    • 2017
  • Cadmium compounds with one dimension (1D) nanostructures have attracted attention for their excellent electrical and optical properties. In this study, vertically aligned CdTe-Si nanostructures with high density were synthesized by several simple chemical reactions. First, l D Te nanostructures were synthesized by silver assisted chemical Si wafer etching followed by a galvanic displacement reaction of the etched Si nanowires. Nanowire length was controlled from 1 to $25{\mu}m$ by adjusting etching time. The Si nanowire galvanic displacement reaction in $HTeO_2{^+}$ electrolyte created hybrid 1D Te-branched Si nanostructures. The sequential topochemical reaction resulted in $Ag_2Te-Si$ nanostructures, and the cation exchange reaction with the hybrid 1D Te-branched Si nanostructures resulted in CdTe-Si nanostructures. Wet chemical processes including metal assisted etching, galvanic displacement, topochemical and cation exchange reactions are proposed as simple routes to fabricate large scale, vertically aligned CdTe-Si hybrid nanostructures with high density.

코발트망간 산화물 양전극과 활성탄 음전극으로 구성된 초고용량 커패시터 특성 (Supercapacitive Properties of a Hybrid Capacitor Consisting of Co-Mn Oxide Cathode and Activated Carbon Anode)

  • 김용일;윤재국;권재성;고장면
    • Korean Chemical Engineering Research
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    • 제48권4호
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    • pp.440-443
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    • 2010
  • 양극인 Co-Mn oxide과 음극인 활성탄, 전해질인 6 M KOH 수용액으로 구성된 혼성 커패시터를 제조하여 cyclic voltammetry를 이용하여 전기화학적 특성을 조사하였다. 제조한 초고용량 커패시터는 0~1.4 V 전위영역에서 안정한 전위창을 나타내며, 주사속도 5 mV/s일 때 비용량 67.3 F/g, 에너지 밀도 18.3 Wh/kg, 출력 밀도는 237.7 kW/kg을 나타내었다.

친환경 전기 하이브리드 자동차용 마그네슘 다이캐스팅 인버터 하우징의 열방출 특성 (Study on the Heat Dissipation Behavior of Diecast Mg Inverter Housing for Eco-friendly Hybrid Vehicles)

  • 조인성;한요섭;이승재;이병준
    • 한국주조공학회지
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    • 제38권3호
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    • pp.60-65
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    • 2018
  • In the present study, the characteristics of Mg inverter cases for hybrid cars are investigated. Concerns over the use of lightweight materials to reduce energy use and to mitigate emission problems are inevitable in the twenty-first century. Magnesium is a promising material for the manufacturing of lightweight parts. Several cases for thermal cooling channels have been designed and simulated, and the effects of materials and coatings on the thermal cooling efficiency have been discussed. The effects of the coating thickness on heat extraction in an Mg inverter housing case using the PEO (plasma electrolyte oxidation) coating method were also discussed. In order to produce an inverter case by the diecasting process, the filling sequence and cooling behavior during the diecasting process were simulated. The optimized process conditions from the simulation result were then used in a trial diecasting experiment.