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Thin Film Process for Thin Film Solid Oxide Fuel Cells - A Review
조구영(Gu Young Cho),이윤호(Yoon Ho Lee),차석원(Suk Won Cha) Korean Society for Precision Engineering 2018 한국정밀공학회지 Vol.35 No.12
Thin film solid oxide fuel cells (TF-SOFCs) are considered to be a promising next generation energy conversion device. TFSOFCs have many advantages such as rapid turn-on and off, fuel flexibility, material flexibility, high power density and availability of compact system. Electrodes and electrolytes of TF-SOFCs are fabricated by thin film processes. In order to fabricate high performance TF-SOFCs, proper thin film processes have to be used due to the unique requirements of each part of the TF-SOFCs. This paper reviews the thin film deposition process for fabrication of TF-SOFCs and the advantages and disadvantages of physical and chemical vapor deposition processes. In addition, materials prepared through thin film processes and the performance results of TF-SOFCs are reviewed.
최종우(Jongwoo Choi),조구영(Gu Young Cho),임재환(Jaehwan Lim),이호섭(Hosub Lee),정하철(Hachul Jeong),차석원(Suk-Won Cha) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
In this paper, battery model based on voltage loss is simulated. There are three main energy (voltage) losses during battery working; ohmic loss, electrochemical loss, mass transport loss. Mass transport loss is ignored due to it only arises when battery SOC is nearly zero. This paper focused energy loss due to electrochemical characteristics of the battery. Butler-Volmer equation and Randles circuit are introduced to modeling electrochemical energy loss. Results show that both methods work well for the simple cell level simulation.
장계은(Gye Eun Jang),이영조(Young Jo Lee),조구영(Gu Young Cho) Korean Society for Precision Engineering 2022 한국정밀공학회지 Vol.39 No.2
In this study, polymer bipolar plates for ultra-light polymer electrolyte membrane fuel cells (PEMFCs) were fabricated. Various methods for current collecting were applied to ensure electron conductivity of the polymer bipolar plates. Direct wire contact and Ag sputter process were applied. The Ag current collecting layer fabricated by the sputter process showed a well-covered and defectless surface. After preparations of bipolar plates, the effects of current collecting methods of bipolar plates on the electrochemical properties of PEMFCs were systematically investigated. The maximum power density of PEMFCs with the Ag current collecting of layered polymer bipolar plates decreased 37.39% because of increased ohmic resistance. However, the power/weight of PEMFCs with the Ag current collecting of layered polymer bipolar plates increased 27.23% because of the dramatically reduced weight (-50.63%) of bipolar plates compared to the graphite bipolar plates. We affirm that results in this report can provide meaningful insight for portable electrochemical energy devices.