https://scholar.dgist.ac.kr/handle/20.500.11750/15721 2026-04-22T15:36:07Z https://scholar.dgist.ac.kr/handle/20.500.11750/47417 Title: 소형 로봇용 연료 전지 스택 설계 사양 최적화 Author(s): 황순욱; 최경호; 박용헌; Ench, R. Michael; Bates, Alex M.; 이상철; 권오성; 이동하 Abstract: Proton Exchange Membrane Fuel Cells (PEMFC) are the most appropriate for energy source of small robot applications. PEMFC has superior in power density and thermodynamic efficiency as compared with the Direct Methaol Fuel Cell (DMFC). Furthermore, PEMFC has lighter weight and smaller size than DMFC which are very important factors as small robot power system. The most significant factor of mobile robots is weight which relates closely with energy consumption and robot operation. This research tried to find optimum specifications in terms of type, number of cell, active area, cooling method, weight, and size. In order to find optimum 500W PEMFC, six options are designed in this paper and studied to reduce total stack weight by applying new materials and design innovations. However, still remaining problems are thermal management， robot space for energy sources, and so on. For a thermal management, design options need to analysis of Computational Fluid Dynamics (CFD) for determining which option has the improved performance and durability. 2012-03-28T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/5516 Title: Developing a new course on energy storage systems: Introducing energy challenges for next-generation engineers Author(s): Choi, Gyeung Ho; Park, Sam Abstract: A new elective undergraduate/graduate course, Energy Storage Systems, has been taught since May 2012 at the University of Louisville. The aim of the course is to help undergraduate and graduate students to learn the fundamental principles of energy storage systems, design, and analyze energy storage systems for practical applications. Active learning tools developed by this course will be shared with DGIST/UofL. © 2013 IEEE. 2012-12-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/3860 Title: Development of a high performance MEA using Current-sensing Atomic Force Microscopy (CS-AFM) and (Nano-scale impedance spectroscopy (NIS) Author(s): Kwon, O Sung; Lee, Sang Cheol; Lee, Dong Ha; Han, Byungchan; Hwang, Sun-Wook; Choi, Gyeungho; Mukherjee, Santanu; Bates, Alex Bates; Park, Sam Abstract: Current-sensing Atomic Force Microscopy (CS-AFM) and Nano-scale Impedance Spectroscopy (NIS) are key characterization tools in the research and development of diverse materials systems. These have been used in fuel cell research to distinguish between various sources of cell losses; for example, ohmic losses in the electrodes and electrolytes, activation over-potentials due to reaction kinetics, and mass transport effects. Proton transport and water diffusion phenomena are locally observed to determine the ionic channel structure and mechanism. © The Electrochemical Society. 2011-12-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/3875 Title: A novel lightweight polymer electrolyte fuel cell stack for robot systems Author(s): HHwang, Sun-Wook; Choi, Gyeungho; Bates, Alex; Ench, Robert Michael; Lee, Sang Cheol; Kwon, O Sung; Lee, Dong Ha; Mukherjee, Santanu; Park, Sam Abstract: Proton exchange membrane fuel cells (PEMFCs) are the most appropriate for energy sources of small robot applications. PEMFCs have superior power density and thermodynamic efficiency compared with direct methanol fuel cells (DMFCs). Furthermore, PEMFCs are lighter and smaller than DMFCs, which are very important factors in small robot power systems. Operating conditions and fabricating methods are of key importance to fuel cell performance and efficiency. In this study, analysis of pressure drop, concentration variation, deformation of GDL and electrolytes, and stack clamping pressure were completed by 500-watt polymer electrolyte membrane fuel cell stacks. Several novel designs were discussed and will be continuously studied. © The Electrochemical Society. 2011-12-31T15:00:00Z