• 제목/요약/키워드: Metal Hydride

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수소저장용 금속수소화물$(Mm(La_{0.6-0.8})Ni_{4.0}Co_{0.6}Mn_{0.2}Al_{0.2})$의 전열촉진 (Heat transfer enhancement of metal hydride $(Mm(La_{0.6-0.8})Ni_{4.0}Co_{0.6}Mn_{0.2}Al_{0.2})$ for hydrogen storage)

  • 배상철
    • 신재생에너지
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    • 제2권2호
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    • pp.75-80
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    • 2006

  • The effective thermal conductivities of $Mm(La_{0.6-0.8})Ni_{4.0}Co_{0.6}Mn_{0.2}Al_{0.2}$ [TL-492] with hydrogen and helium have been examined. Experiment results show that pressure has great influence on effective thermal conductivity in low pressure range [below 0.5 MPa]. And that influence decreases rapidly with increase of gas pressure. The reason is at low pressure, the mean free path of gas becomes greater than effective thickness of gas film which is important to the heat transfer mechanism in this research. And, carbon fibers have been used to try to enhance the poor thermal conductivity of TL-492. Three types of carbon fibers and three mass fractions have been examined and compared. Naturally, the highest effective thermal conductivity has been reached with carbon fiber which has highest thermal conductivity, and highest mass fraction. This method has acquired 4.33 times higher thermal conductivity than pure metal hydrides with quite low quantity of additives, only 0.99 wt% of carbon fiber. This is a good result comparing to other method which can reach higher effective thermal conductivity but needs much higher mass fraction of additives too.

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자전연소합성법으로 제조한 80wt% AB2-15wt% Mg-5wt% Mm 금속수소화물의 cycling특성 (Cycling Properties of 80wt% AB2-15wt% Mg-5wt% Mm Metal Hydride made by Hydriding Combustion Synthesis)

  • 허태홍;한정섭
    • 한국수소및신에너지학회논문집
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    • 제22권5호
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    • pp.634-640
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    • 2011

  • The effect of cycling on the absorption and desorption characteristics of the 80 wt% $AB_2$-15 wt% Mg-5 wt% Mm system was investigated. The material was made by Hydrogen Combustion Synthesis. The cycling experiment was performed at 298 K, 30 atm for 15 min. During the reaction time, the amount of absorption was fully desorbed. After the full activation, the hydrogen storage capacity was 1.57 wt% and the capacity was maintained until 50 cycles. And the reaction rate does not change with an increase in the number of cycles. This material has good durability and reversible feature.

  • https://doi.org/10.7316/khnes.2011.22.5.634 인용 PDF KSCI

MgHx-Sc2O3 복합재료의 수소화 특성 (Hydrogenation Properties on MgHx-Sc2O3 Composites by Mechanical Alloying)

  • 김경일;김용성;홍태환
    • 한국수소및신에너지학회논문집
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    • 제21권2호
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    • pp.81-88
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    • 2010

  • Hydrogen energy applications have recognized clean materials and high energy carrier. Accordingly, Hydrogen energy applies for fuel cell by Mg and Mg-based materials. Mg and Mg-based materials are lightweight and low cost materials with high hydrogen storage capacity. However, commercial applications of the Mg hydride are currently hinder by its high absorption/desorption temperature, and very slow reaction kinetics. Therefore one of the most methods to improve kinetics focused on addition transition metal oxide. Addition to transition metal oxide in $MgH_x$ powder produce $MgH_x$-metal oxide composition by mechanical alloy and it analyze XRD, EDS, TG/DSC, SEM, and PCT. This report considers kinetics by transition metal oxide rate and Hydrogen pressure. In this research, we can see behavior of hydriding/dehydriding profiles by addition catalyst (transition metal oxide). Results of PCI make a excellent showing $MgH_x$-5wt.% Sc2O3 at 623K, $MgH_x$-10wt.% $Sc_2O_3$ at 573K.

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수소저장합금을 이용한 수소저장탱크의 구조에 따른 수소저장 특성 연구 (Study on the Characteristics of Hydrogen Storage according to the Structure of Storage Tank using Metal Hydride)

  • 심규성;명광식;김정덕;김종원
    • 한국수소및신에너지학회논문집
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    • 제13권1호
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    • pp.90-99
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    • 2002

  • In order to utilize hydrogen energy in a large-scale in the future, development of effective hydrogen storage method is essentially required as well as that of efficient hydrogen production method. The hydrogen storage method using metal hydrides has been holding the spotlight as a safer and higher-density hydrogen storage method than conventional hydrogen storage methods such as liquid hydrogen or compressed hydrogen storage method. However when metals react with hydrogen to store hydrogen as metal hydrides, they undergo exothermic reactions, while metal hydrides evolve hydrogen by endothermic reaction. Therefore, hydrogen storage tank should have such structure that it can absorb or release reaction heat rapidly and efficiently. In this study, a review on the improvement of the heat release and absorption structure in the hydrogen storage tank was conducted, and as a result, a new type of hydrogen storage tank with the structure of vertical-type wall was designed and manufactured. Experimental results showed that this new type of tank could be used as an efficient hydrogen storage tank because its structure is simpler and manufacture is easier than cup-type hydrogen storage tank with the structure of packed horizontal cup.

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Palladium-based Electrical and Optical Hydrogen Gas Sensors

  • Jinwoo, Lee;Minah, Seo
    • 센서학회지
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    • 제31권6호
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    • pp.397-402
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    • 2022

  • In this short review, we explore the recent progress in metal-based gas-sensing techniques. The strong interaction between the metal films and hydrogen gas can be considered to play a considerably important role in the gas-sensing technique. The physical and chemical reactions in Pd-Pd hydride systems were studied in terms of the phase transition and lattice expansion of the metals. Two types of represented detection, electrical and optical, were introduced and discussed along with their advantages.

  • https://doi.org/10.46670/JSST.2022.31.6.397 인용 PDF KSCI