• Title/Summary/Keyword: 수전해

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Hydrogen Production Systems through Water Electrolysis (물 전기분해에 의한 수소제조 기술)

  • Hwang, Gab-Jin;Choi, Ho-Sang
    • Membrane Journal
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    • v.27 no.6
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    • pp.477-486
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    • 2017
  • Hydrogen is one of energy storage systems, which could be transfer from electric energy to chemical energy or from chemical energy to electric energy, and is as an energy carrier. Water electrolysis is being investigating as one of the hydrogen production methods. Recently, water electrolysis receive attention for the element technology in PTG (power to gas) and PTL (power to liquid) system. In this paper, it was explained the principle and type for the water electrolysis, and recent research review for the alkaline water electrolysis.

Research and Development Trend of Electrolyte Membrane Applicable to Water Electrolysis System (수전해 시스템에 적용 가능한 전해질막 연구 개발 동향)

  • Im, Kwang Seop;Son, Tae Yang;Kim, Kihyun;Kim, Jeong F.;Nam, Sang Yong
    • Applied Chemistry for Engineering
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    • v.30 no.4
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    • pp.389-398
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    • 2019
  • Hydrogen energy is not only a solution to climate change problems caused by the use of fossil fuels, but also as an alternative source for the industrial power generation and automotive fuel. Among hydrogen production methods, electrolysis of water is considered to be one of the most efficient and practical methods. Compared to that of the fossil fuel production method, the method of producing hydrogen directly from water has no emission of methane and carbon dioxide, which are regarded as global environmental pollutants. In this paper, the alkaline water electrolysis (AWE) and polymer electrolyte membrane water electrolysis (PEMWE), which are one of the hydrogen production methods, were discussed. Recent research trends of hydrocarbon electrolyte membranes and the crossover phenomenon of electrolyte membranes were also described.

Dynamic Model of Water Electrolysis for Prediction of Dynamic Characteristics of Cooling System (냉각계통 동적 예측을 위한 수전해 시스템 동적 모사 모델)

  • YUN, SANGHYUN;YUN, JINYON;HWANG, GUNYONG
    • Transactions of the Korean hydrogen and new energy society
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    • v.32 no.1
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    • pp.1-10
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    • 2021
  • Water electrolysis technology, which generates hydrogen using renewable energy resources, has recently attracted great attention. Especially, the polymer electrolyte membrane water electrolysis system has several advantages over other water electrolysis technologies, such as high efficiency, low operating temperature, and optimal operating point. Since research that analyzes performance characteristics using test bench have high cost and long test time, however, model based approach is very important. Therefore, in this study, a system model for water electrolysis dynamics of a polymer electrolyte membrane was developed based on MATLAB/Simulink®. The water electrolysis system developed in this study can take into account the heat and mass transfer characteristics in the cell with the load variation. In particular, the performance of the system according to the stack temperature control can be analyzed and evaluated. As a result, the developed water electrolysis system can analyze water pump dynamics and hydrogen generation according to temperature dynamics by reflecting the dynamics of temperature.

High Temperature Water Electrolysis of Covalently Cross-linked CL-SPEEK/Cs-TSiA/Ceria Composite Membrane (공유가교 CL-SPEEK/Cs-TSiA/Ceria 복합막의 고온 수전해 성능)

  • JUNG, HYEYOUNG;YOON, DAEJIN;CHUNG, JANGHOON;MOON, SANGBONG
    • Transactions of the Korean hydrogen and new energy society
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    • v.28 no.5
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    • pp.433-439
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    • 2017
  • The high temperature performance of PEM type electrolyser at $120^{\circ}C$ based on covalently cross-linked sulfonated poly ether ether ketone (SPEEK) composie membrane was investigated. Ion conductivity and other properties of SPEEK membrane were improved by adding heteropoly acid and Ceria. The membrane electrode assemblies were prepared using commercial PtC and nano-sized $IrRuO_2$ catalyst by electro-spraying and decal process. Voltage efficiency of MEA equipped with SPEEK membrane was slightly better than that of $Nafion^{(R)}$ membrane, due to its higher proton conductivity at high temperature. The cell performance of MEA with CL-SPEEK/Cs-TSiA/Ceria is 1.71 V at $1A/cm^2$ and $120^{\circ}C$.

Microstructure Analysis with Preparation Condition of Electrolyte Membrane for High Temperature Electrolysis (고온 수전해 전해질 막의 제막조건에 따른 미세구조 분석)

  • Choi, Ho-Sang;Son, Hyo-Seok;Hwang, Gab-Jin;Bae, Ki-Kwang
    • Transactions of the Korean hydrogen and new energy society
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    • v.17 no.2
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    • pp.141-148
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    • 2006
  • This study was carried out to analyze the microstructure characteristics of electrolyte membrane through XRD, SEM and AC impedance measurement for using in high temperature steam electrolysis(HTE). It was investigated that thermal stability and electric characteristics by sintering condition using dry and wet process, and confirmed growth of particle and density change by sintering temperature. The sintering temperature and behavior had an effect on the relative density of the ceramic and the average grain size. The more amount of dispersant in organic compound increase, the more the density increased. But the binder was shown opposite phenomenon. It was analyzed that electrolyte resistance and electrical characteristics using AC impedance. The electrical properties of YSZ grain boundary changed with the sintering temperature.

A Proposed High Voltage Distribution System of the Customer Inside for Reducing Power Loss (수용가내부 고압배전시스템의 전력손실감소효과)

  • Park, Hyung-Joon;Yun, Man-Soo;Chung, Chan-Soo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.19 no.5
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    • pp.39-44
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    • 2005
  • This paper is about the new distribution system of the electric customer inside. The power loss in the distribution system of the customer is disregarded and rarely managed so for. But, economically, this loss is not small quantity to ignore. So, in this paper, we suggest that the new distribution system of the electric customer inside by simply changing the locations of power transformer and other power facilities which is located inside of the customer. And we also show that the power loss is decreased with this systematic changing by approximated calculation.

Hydrogen Production Technology using High Temperature Electrolysis (고온 수전해에 의한 수소 제조 기술)

  • Hong, Hyun Seon;Choo, Soo-Tae;Yun, Yongseung
    • Transactions of the Korean hydrogen and new energy society
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    • v.14 no.4
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    • pp.335-347
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    • 2003
  • High temperature electrolysis (HTE) can become a key target technology for fulfilling the hydrogen requirement for the future hydrogen economy. This technology is based upon the partial replacement of electricity with heat energy for the electrolysis. Although the current research status of high temperature electrolysis in many countries remains at the small laboratory scale, the technology has great potential for producing hydrogen at a higher efficiency than low-temperature electrolysis (LTE). The efficiency of LTE is not expected to rise above 40%, whereas the efficiency of HTE has been reported to be above 50%. The higher efficiency of HTE would reduce costs by more than 30% compared to LTE. In this study, the technical data regarding the HTE of water and the resulting hydrogen production are reviewed, with an emphasis on the application of high temperature solid electrolyte and oxide electrodes for the HTE process.

Evaluation of the Performance of Water Electrolysis Cells and Stacks for High-Altitude Long Endurance Unmanned Aerial Vehicle (고고도 무인기용 수전해 셀 및 스택의 제작 및 성능 평가)

  • JUNG, HYE YOUNG;LEE, JUNYOUNG;YOON, DAEJIN;HAN, CHANGHYUN;SONG, MINAH;LIM, SUHYUN;MOON, SANGBONG
    • Transactions of the Korean hydrogen and new energy society
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    • v.27 no.4
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    • pp.341-348
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    • 2016
  • The experiments related on structure and water electrolysis performance of HALE UAV stack were conducted in this study. Anode catalyst $IrRuO_2$ was prepared by Adam's fusion methods as 2~3 nm nano sized particles, and the cathode catalyst was used as commercial product of Premetek. The MEA (membrane electrode assembly) was manufactured by decal methods, anode and anode catalytic layers were prepared by electro-spray. HALE stack was composed of 5 multi-cells as $0.2Nm^3/hr$ hydrogen production rate with hydrogen pressure as 10 bar. The water electrolysis performance was investigated at atmospheric pressure and temperature of $55^{\circ}C$. Best performance of HALE UAV stack was recorded as cell voltage efficiency as 86%.

Economic Feasibility Analysis for P2G Using PEM Water Electrolysis (PEM 수전해를 이용한 P2G에 대한 경제적 타당성 분석)

  • JEONG, SEONJU;CHOI, NAK HEON;MOON, CHANGHWAN;MOON, SANGBONG;LIM, HANKWON
    • Transactions of the Korean hydrogen and new energy society
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    • v.28 no.3
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    • pp.231-237
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    • 2017
  • With worldwide efforts to increase the portion of renewable energy for $CO_2$ reductions, a lot of attention has been paid to P2G (power-to-gas) in Europe and Japan to efficiently utilize the surplus electricity. In this paper, economic feasibility analysis has been carried out for P2G using PEM water electrolysis by reflecting current economic status in Korea. In addition, efficiency and electricity price required to be competent in Korean market were provided. Based on cash flow diagrams, unit production costs for $H_2$ and $CH_4$ were estimated and profitability of P2G using PEM water electrolysis was analyzed.