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전자빔 합성 방식 연료전지 촉매 반응기의 냉각 성능 설계
배석정(Sukjung Bae),허형석(Hyungseok Heo),양대수(Daesoo Yang),윤영철(Yeongcheol Yoon) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
For the purpose of reduction of fossil fuel-based energy share and ultimately taking it over, researches on fuel cells that convert chemical energy into electrical energy have been actively conducted over the past few decades. Catalyst used to activate the oxygen reduction reaction in the reduction electrode of the fuel cell is a core material that determines the power generation efficiency by allowing the chemical reaction rate to be adjusted. Hydrated electrons accelerated close to a light speed having a powerful reducing force among various chemical species generated by water decomposition are able to reduce metal ions in a short time by irradiating electron beams to an aqueous solution including a metal precursor, thereby uniformly producing nanometer-sized catalyst particles on the surface of carbon carriers. In this study, reactor cooling performance has been designed to remove the heat generated inside the reactor. Cooling performance characteristics of precursor sample of catalyst have been analyzed according to several reactor models. The performance analysis has been performed according to coolant inlet conditions and mixer geometries.
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연료전지 촉매의 성능 및 내구성 확보를 위한 전자빔 반응기 냉각 성능 평가
이현석(Hyunseok Lee),배석정(Sukjung Bae),허형석(Hyungseok Heo),양대수(Daesoo Yang),윤영철(Yeongcheol Yoon) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
Fuel cell catalyst is used to activate oxygen reduction reactions in the reduction electrode, which is a core material for improving power generation efficiency in the hydrogen fuel cell field. The electron beam process is environmentally friendly amongst the fuel cell catalyst manufacturing methods, in which metal ions in the solution is reduced without using reduction agent. The electron beam synthesis process is performed in a room temperature environment, and reaction heat is generated while receiving electrons irradiated from electron beam and performing the reduction process. In this study, a reactor has been evaluated with cooling performance to cool down the reaction heat generated. The reactor evaluation has been performed by measuring the temperatures of the aqueous precursor solution at time points, e.g.,initial stage before the electron beam synthesis process, 20 minutes after the electron beam irradiation, and 10 minutes after cooling after the electron beam irradiation is terminated. As the result of the evaluation, it is determined that a sufficiently low temperature of the solution after electron beam process can be acquired according to the change in the electron beam irradiation and coolant conditions.
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