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Received August 5, 2022
Revised October 24, 2022
Accepted October 31, 2022
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PEMFC에서 Pt-Co/C Cathode 촉매가 고분자막의 전기화학적 내구성에 미치는 영향

Effect of Pt-Co/C Cathode Catalyst on Electrochemical Durability of Membrane in PEMFC

1순천대학교 화학공학과 57922 전라남도 순천시 중앙로 255 2한국자동차연구원 31214 충청남도 천안시 동남구 풍세면 풍세로 303
1Department of Chemical Engineering, Sunchon National University, 255, Jungang-ro, Suncheon-si, Jeollanam-do, 57922, Korea 2KATECH, 303, Pungse-ro, Pungse-myeon, Dongnam-gu, Cheonan-si, Chungcheongnam-do, 31214, Korea
Korean Chemical Engineering Research, May 2023, 61(2), 189-195(7), 10.9713/kcer.2023.61.2.189 Epub 31 May 2023
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PEMFC(고분자 전해질 막 연료전지) cathode 촉매로 Pt-Co/C가 내구성 향상 때문에 최근에 많이 사용되는 추세이 다. 연료전지에서 전극과 전해질은 상호 간에 성능과 내구성 면에서 밀접하게 영향을 준다. Pt/C 전극 촉매에서 Pt-Co/ C로 대체되었을 때 고분자 전해질막의 전기화학적 내구성에 미치는 영향에 대해서 연구하였다. PEMFC 고분자막의 전기화학적 가속 열화 과정에서 Pt-Co/C MEA(막전극접합체)의 내구성이 Pt/C MEA 내구성보다 높았다. FER (불소 유출속도)와 수소투과도를 분석한 결과 Pt-Co/C MEA의 고분자막 열화속도가 Pt/C MEA보다 낮음을 보였다. OCV(개회 로전압) holding 과정에서 Pt-Co/C 전극의 활성면적 감소속도가 Pt/C 전극보다 낮고, 고분자막에 석출되는 Pt 양도 PtCo/C MEA가 Pt/C MEA보다 작았다. 고분자막 내부의 Pt는 라디칼을 생성해서 고분자막을 열화시킴으로 Pt 석출 속 도가 높은 Pt/C MEA의 고분자막 열화속도가 높게 나타났다. Pt-Co/C 촉매를 사용하면 전극 내구성도 향상되고, 고분자 막에 석출되는 Pt양도 감소해서 고분자막의 전기화학적 내구성을 향상시켰다. Abstract − As a PEMFC (Polymer Exchange Membrane Fuel Cell) catho

As a PEMFC (Polymer Exchange Membrane Fuel Cell) cathode catalyst, Pt-Co/C has recently been widely used because of its improved durability. In a fuel cell, electrodes and electrolytes have a close influence on each other in terms of performance and durability. The effect on the electrochemical durability of the electrolyte membrane when Pt-Co/C was replaced in the Pt/C electrode catalyst was studied. The durability of Pt-Co/C MEA (Membrane Electrode Assembly) was higher than that of Pt/C MEA in the electrochemical accelerated degradation process of PEMFC membrane. As a result of analyzing the FER (Fluorine Emission Rate) and hydrogen permeability, it was shown that the degradation rate of the membrane of Pt-Co/C MEA was lower than that of Pt/C MEA. In the OCV (Open Circuit Voltage) holding process, the rate of decrease of the active area of the Pt-Co/C electrode was lower than that of the Pt/C electrode, and the amount of Pt deposited on the membrane was smaller in Pt-Co/C MEA than in Pt/C MEA. Pt inside the polymer membrane deteriorates the membrane by generating radicals, so the degradation rate of the membrane of Pt/ C MEA with a high Pt deposition rate was higher than Pt-Co/C MEA. When the Pt-Co/C catalyst was used, the electrode durability was improved, and the amount of Pt deposited on the membrane was also reduced, thereby improving the electrochemical durability of the membrane.


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