The renewable energy has, currently, been used because of its eco-friendly energy such as no emission gas and less environmental pollution. Fuel cell electric vehicle (FCEV) using polymer electrolyte membrane fuel cell (PEMFC) uses the hydrogen as fuel to obtain the power by electrochemical reaction. The objective of this study is to investigate the flow characteristics of the hydrogen according to entrainment ratio for ejector of FCEV through comparison analysis with the air. As the results, the flow of hydrogen in ejector corresponds to turbulence with Reynold number 18,093. The pressure difference of the hydrogen between primary flow and secondary flow in ejector was about 16 times compared with that of the air. The mean velocity of the hydrogen in ejector outlet was faster about 15 times than the air.

Performance of the hydrogen fuel cell system in a compact special vehicle is mainly influenced by the thermal characteristics of heat release through air flow with electrochemical mechanisms. In this study, numerical analysis has been carried out to investigate air flow and heat transfer characteristics near the fuel cell system for various operating conditions. The cooling characteristics around the radiator system depend on air flow generated by vehicle movement, and the effects of vehicle-induced air flow on the velocity and temperature distributions within the heat release system were examined. These results showed that there are quite complicated air flow around the radiator and fan near the fuel cell system in the vehicle cargo area, and its efficient flow field resulted in cooling performance improvement with driving speed. Hence overall heat release characteristics of the hydrogen fuel cell system are strongly associated with various air flow behavior formed around the compact special vehicle including cargo area.

This paper is to study SOFC(Solid Oxide Fuel Cell) technology which is becoming increasingly more important in recent power development market. I will propose the most suitable fuel cell type through efficiency analysis by type of fuel cell in operation. In this paper, I analyzed the characteristics of SOFC development, theoretical study of the system technology and the level of progress in SOFC technology for each generation. In conclusion, through analysis of the operation data of the installed and operating fuel cell power generation system, it was found that SOFC is 45% more efficient than PAFC and 25% more efficient than MCFC.

공유 유기 골격체(covalent organic frameworks, COF)는 기능성을 정밀하게 설계하고 제어할 수 있는 결정성 다 공성 소재로서, 차세대 연료전지 멤브레인으로 주목받고 있다. 표준 양성자 교환막인 나피온(Nafion)은 높은 비용과 좁은 가 용 범위 등의 한계에 직면해 있다. 본 논문은 COF를 다양한 고분자 매트릭스에 도입하여 이러한 단점을 극복하기 위한 최신 연구 전략을 심도 있게 다룬다. 특히 양성자 교환막 연료전지(proton exchange membrane fuel cells, PEMFC), 음이온 교환막 연료전지(anion exchange membrane fuel cells, AEMFC), 그리고 고온(high-temperature) PEMFC (HT-PEMFC)용 COF 기반 복합막의 설계와 성능 특성에 집중한다. 다양한 COF 기능화 및 복합화 전략을 통해 이온 전도도, 기계적 강도 및 운전 안정 성을 향상시킨 주요 연구들을 비평적으로 논하며, 연료전지의 전반적인 효율 향상에 대한 COF의 잠재력을 조명한다.

Proton Exchange Membrane Fuel Cells (PEMFCs) are emerging as reliable energy conversion devices for stationary power generation due to their high efficiency and environmental benefits. However, achieving long-term durability remains a critical challenge for commercialization. This study investigates the performance and degradation behavior of a PEMFC stack under 360 hours of constant current operation at approximately 0.22-0.23 A/cm², delivering a stack output of 1.5 kW. Electrochemical Impedance Spectroscopy (EIS) was employed to diagnose cell degradation, revealing increases in ohmic and charge transfer resistances over time. The results highlight the importance of uniform cell performance within the stack to prevent output limitations. Furthermore, we propose a framework for Remaining Useful Life (RUL) prediction to enhance system reliability. Future work will focus on applying these diagnostic techniques under varied operating conditions and integrating machine learning for advanced predictive models, aiming to support the development of stable, long-life PEMFC systems for stationary energy applications.

In this study, static and dynamic analysis verification was performed to apply the fuel cell system to the E-PTO of the Wire aerial vehicle. First, structural analysis was performed to improve the weak points that occurred. Next, vibration analysis was performed on the fuel cell system for which structural safety review was completed according to the wide-band irregular vibration test standard. The analysis results showed that resonance occurred in a specific frequency band and local stress was high, so stiffness reinforcement was performed. After reinforcing the stiffness, stress was reduced through a decrease in transient response characteristics and resonance phenomenon.

Researchers have made significant strides in developing high-performance anode-supported tubular solid oxide fuel cells (SOFCs). These cells feature a thin, dense electrolyte made of Ba(Zr0.1Ce0.7Y0.2)O3-δ (BZCY). The fabrication process involved several key steps. First, fine BZCY powder was prepared using a co-precipitation method. Next, Ni-BZCY anode tubes were created via an extrusion process, boasting a 34 % porosity and an average pore size of 0.381 μm. To optimize cell performance, a Ni-BZCY/BZCY nanocomposite slurry was applied as an anode functional layer (AFL) using a dip-coating method. The BZCY electrolyte itself was then coated with a vacuum slurry coating, and finally, an LSCF-BZCY cathode was added, prepared with dip-coating methods. Impedance analysis, conducted under open-circuit conditions at 700 °C, revealed impressive electrical characteristics. The BZCY electrolyte showed an ohmic resistance of approximately 0.79 Ωcm-2 and a very low polarization resistance of about 0.036 Ωcm-2. When tested in a humidified hydrogen atmosphere (3 % H2O) at temperatures ranging from 600 °C to 700 °C, these tubular BZCY cells delivered outstanding power output. Specifically, they achieved a remarkable maximum power density of roughly 0.51 Wcm-2 at 700 °C. This research highlights the potential of these advanced tubular solid oxide fuel cells based on the BZCY as a proton conductor for efficient energy conversion.

국제해사기구(IMO)의 선박 환경규제 강화에 따라 선박 배출 온실가스 저감을 위한 대체연료 및 새로운 추진시스템의 도입이 활발히 진행되고 있다. 특히 연료전지와 배터리를 결합한 하이브리드 전기추진시스템은 배출가스 제로 및 높은 에너지 효율을 통해 차세 대 친환경 선박의 주요 대안으로 주목받고 있다. 본 연구에서는 이러한 전기추진시스템에 적용되는 암모니아 개질기의 선박 탑재를 위한 시험기준과 절차를 개발하고 그 타당성을 검증하였다. 암모니아는 저장 용이성, 운송 효율성 및 무탄소 배출 특성으로 인해 차세대 수소 공급원으로 주목받지만, 고온 개질기 필요, 독성 및 부식성, 잔류 암모니아 슬립 등 복합적 기술 문제와 안정성 확보 방안이 필수적이다. 이를 해결하기 위한 방안으로 본 논문은 실선 운항 조건을 반영한 4가지 핵심 시험항목(수소 생산량, 수소 순도, 잔류 암모니아 슬립, 경 사안정성)을 도출하고, 각 항목별로 시험환경, 절차, 측정기준, 수용기준을 포함한 정량적 시험방법론을 제시하였다. 해당 시험기준은 ISO 14687, IMO IGF Code 등 국제 기준을 기반으로 연계되며, 실선박에서의 신뢰성, 반복성, 실현가능성을 확보하기 위한 기반 자료로 활용 가 능하다.