반응성 기계적 분쇄에 의해 제조한 Mg-10wt.% MnO의수소 저장 성질

송명엽,배종수,권익현,권성남,박찬기 한국수소및신에너지학회 2005 한국수소 및 신에너지학회논문집 Vol.16 No.1

수소 분위기에서 10wt.%MnO와 기계적인 분쇄(반응성 기계적 분쇄)에 의해 Mg의 수소 저장 성질을 향상시켰다. 회전 속도는 250 rpm, 밀링시간은 2 h, 그리고 시료 대 볼 중량비는 1/45이었다. 준비한 Mg-10wt.%MnO 시료는 활성화를 위한 수소화물 형성 분해 싸이클링이 필요없었으며, 첫 번째 싸이클 593K 12 bar H2에서, 10분 동안에 3.12wt.%, 60분 동안에 3.95wt.%의 수소를 흡수하였다. 또한 Mg-10wt.%MnO는 593K 0.8 bar H2에서 60분 동안에 2.12wt.%의 수소를 방출하였다. MnO와 Mg의 방응성 분쇄는, 핵생성을 용이케 하고 (Mg 입자의 표면에 결함 형성과 첨가물에 의해), Mg 입자의 표면에 crack을 만들어 Mg의 입자 크기를 줄여 그 결과 수소 원자의 확산 거리를 작게 함으로써 수소 흡수 방출 속도를 증가시킨다. 수소화물 형성 분해 싸이클링은 Mg 입자의 표면에 crack을 만들고 Mg의 입자 크기를 줄여 수소 흡수 방출 속도를 증가시킨다.

수소 기술-경제체제로의 이행을 위한 장단기 시나리오 분석

최현도,박상욱,이민규 한국수소및신에너지학회 2005 한국수소 및 신에너지학회논문집 Vol.16 No.3

최근 수소에너지가 환경문제를 해결해 줄 수 있는 대체에너지로 각광받으면서 수소에너지의 사용이 가지고 올 새로운 에너지 체제에 대한 시나리오 연구가 다양하게 수행되고 있다. 수소 기술-경제체제의 가능한 시나리오를 제시하는 것은 미래 사회에서 수소가 에너지 운반체로서 담당하게 될 역할을 명확히 할 수 있음과 동시에 에너지라는 거대한 기술-경제체제의 변화를 위해 현재 수행해야 할 에너지 정책과 전략에 대해 큰 시사점을 줄 수 있기에 의미가 있다.본 연구는 수소의 생산, 저장 및 운반, 그리고 응용분야에서의 다양한 기술의 SWOT 분석을 통해 가능한 시나리오를 단기와 장기로 나누어 제시했다. 그 결과 앞으로의 수소 기술-경제체제의 구조는 기술적 완성도 뿐 아니라 사회적 수용성, 사회적 적응성 등 외부의 환경변화에도 많은 영향을 받음을 알았다. 그렇기 때문에 수소에너지에 관한 전략과 정책은 이러한 변동을 충분히 고려하면서 결정돼야 한다.

수소연료전지 자동차의 긴급대응 가이드 분석

이광주,이종태,용기중 한국수소및신에너지학회 2012 한국수소 및 신에너지학회논문집 Vol.23 No.2

In case of commercializing of the hydrogen fuel cell vehicle, the suitable emergency response guide is necessary to prepare an accident. In order to suggest the suitable guide for the domestic affairs, the existing external guide about GM, Ford, Honda, and Hyundai was reviewed. The emergency response guides in CAFCP and main FC vehicle makers were included in the analysis. As the results, it was found that the design and make of vehicle for the domestic user are demanded in the emergency response and the guide is made with the shut-down manual picked out for the rescuer and repair man as well as user.

알칼리 수전해용 전극에 관한 연구

최호상,임두순,유철휘,김재철,황갑진 한국수소및신에너지학회 2012 한국수소 및 신에너지학회논문집 Vol.23 No.2

Alkaline electrolysis needs the electrode having a low overvoltage and good corrosion resistance in alkaline solution such as KOH and NaOH, for the oxygen and hydrogen production. The commercial materials such as SUS(stainless steel)-316, Ni and NiFe were evaluated for the electrode in alkaline electrolysis. The test solution for the alkaline electrolysis used 1~9M NaOH and 1~9M KOH. The voltage increased with an increase of current density in each solution. As for the 15wt.% (about 5M) NaOH, the voltage of the tested electrode under the current density of 1.8A/cm2 showed the almost same value. The voltage over the current density of 1.8A/cm2 deceased in the order: Ni≒NiFe<SUS-316. As for the 30wt.% (about 7M) KOH, the voltage of the tested electrode under the current density of 1.8A/cm2 showed the almost same value. The voltage over the current density of 1.8A/cm2 deceased in the order: NiFe<Ni≒SUS-316. From the results, it was estimated that NiFe and Ni was suitable as the electrode for the alkaline water electrolysis using NaOH and KOH electrolyte.

전바나듐계 레독스플로우전지용 집전체에 대한 연구

최호상,황갑진,김재철,유철휘 한국수소및신에너지학회 2011 한국수소 및 신에너지학회논문집 Vol.22 No.2

All-vanadium redox flow battery (VRFB) has been studied actively as one of the most promising electrochemical energy storage systems for a wide range of applications such as electric vehicles, photovoltaic arrays, and excess power generated by electric power plants at night time. Among consisting elements of the VRFB, the ion exchange membrane and the electrode play important roles. In this study, carbon PVC coposite sheets for the VRFB have been developed and electrochemical characteristics investigated. Current collector for VRFB, carbon PVC composite sheets (CPCS), were prepared with G-1028 as a conducting particle, PVC as a polymer, Dibutyl phthalate (DBP) as a plasticizer and fumed Silica (FS) as a dispersion agent. CPCS has been shown to have the characteristics as an excellent current collector for VRFB and electrochemical properties of specific resistivity 0.31 Ωcm, which were composed of G-1028 80 wt%, PVC 10 wt%, DBP 5 wt% and FS 5 wt%.

Development of a Thermal Model for Discharge Behavior of MH Hydrogen Storage Vessels

오상근,조성욱,이경우 한국수소및신에너지학회 2011 한국수소 및 신에너지학회논문집 Vol.22 No.2

Metal hydride alloys are a promising type of material in hydrogen storage applications, allowing for low-pressure, high-density storage. However, while many studies are being performed on enhancing the hydrogen storage properties of such alloys, there has been little research on large-scale storage vessels which make use of the alloys. In particular, large-scale, high-density storage devices must make allowances for the inevitable generation or absorption of heat during use, which may negatively impact functioning properties of the alloys. In this study, we develop a numerical model of the discharge properties of a high-density MH hydrogen storage device. Discharge behavior for a pilot system is observed in terms of temperature and hydrogen flow rates. These results are then used to build a numerical model and verify its calculated predictions. The proposed model may be applied to scaled-up applications of the device, as well as for analyses to enhance future device designs.

The Research about Free Piston Linear Engine Fueled with Hydrogen using Numerical Analysis

왼바흥,오용일,임옥택 한국수소및신에너지학회 2012 한국수소 및 신에너지학회논문집 Vol.23 No.2

This paper presents a research about free piston linear engine (FPLE) fueled with hydrogen, in which,the numerical models are built to simulate the operation during the full stroke of the engine. Dynamic model,linear alternator model and thermodynamic model are used as the numerical models to predict piston velocity,in-cylinder pressure and electric power of FPLE. The spark timing and air gap length are changed to provide information for the prediction. Beside, the heat transfer problem is also investigated in the paper. The results of research are divided by two parts, including motoring mode and firing mode. The result of motoring mode showed that there is validation between simulation and experiment for volume and pressure in cylinder. For firing mode,by increasing spark timing, the velocity of piston, peak pressure and electric power also increase respectively. Beside, when increasing air gap length, the electric power increases accordingly while the motion of piston is not symmetric. The effect of heat transfer also observed clearly by reducing of the peak pressure, velocity of piston and electric power.

탄화수소 환원제 변화가 Fe/ZSM5 촉매를 사용하는 탈질 HC-SCR 반응에 미치는 영향

김성수,김대영,오세용,유승준,박정환,김진걸 한국수소및신에너지학회 2011 한국수소 및 신에너지학회논문집 Vol.22 No.2

HC-SCR was conducted using Fe/ZSM5 catalyst coated over 200 cpi cordierite in the conditions of atomspheric pressure and 200℃-500℃. Among the tested hydrocarbon reductants, isobutane (i-C_4H_10) showed the highest de-NO_x yield of 69% at 320℃ with the mole ratio of reductant/NO_x =1.0. De-NO_x yield resulted by the change of alkane reductant was increased as the carbon number of alkane reductant was increased. The order of increase of de-NO_x yield was proportional to the order of decrease of bonding energy between C and H of reductant, where the H abstraction step from alkane molecule could be the rate controlling step of HC-SCR.

국내외 수소저장기술 특허 분석을 통한 기술개발 동향

김정운,김태욱,류재웅,장기석 한국수소및신에너지학회 2012 한국수소 및 신에너지학회논문집 Vol.23 No.2

The hydrogen storage is one of the key technologies to achieve the successful hydrogen economy and a chain to connect hydrogen production to its utilization. In this paper, characteristics and strong candidates of hydrogen storage technologies were analyzed from the objective information of patents. Also, the hydrogen storage technology trends and gaps were assessed using statistical or qualitative analysis. In this study the patents applied in Korea, Japan, US and EU from 10 or 20 years ago to 2011 were analyzed. The result of patent analysis could be used for developing or searching for promising technology of the hydrogen storage.

황-요오드 열화학 수소 생산 공정에서 니켈-백금 이원금속 촉매를 이용한 요오드화수소 분해 특성

김수영,고윤기,박주식,배기광,김영호 한국수소및신에너지학회 2012 한국수소 및 신에너지학회논문집 Vol.23 No.1

This study was performed to develop a low Pt content catalyst as a catalyst for HI decomposition in S-I process. Bimetallic catalysts added various amounts of Pt on a silica supported Ni catalyst were prepared by impregnation method. HI decomposition was carried out using a fixed bed reactor. As a result, Ni-Pt bimetallic catalyst showed enhanced catalytic activity compared with each monometallic catalyst. Deactivation of Ni-Pt catalyst was not observed while deactivation of Ni monometallic catalyst was rapidly occurred in HI decomposition. The HI conversion of Ni-Pt bimetallic catalyst was increased similar to Pt catalyst with increase of the reaction temperature over a temperature range 573K to 773K. From the TG analysis, it was shown that NiI2 remained on the Ni(5.0)-Pt(0.5)/SiO2 catalyst after the HI decomposition reaction was decomposed below 700K. It seems that small amount of Pt in bimetallic catalyst increase the decomposition of NiI2 generated after the decomposition of HI. Consequently, it was considered that the activity of Ni-Pt bimetallic catalyst was kept during the HI decomposition reaction.