[논문]금속 폼 유로가 고분자전해질 연료전지 성능에 미치는 영향

김준섭; 김준범

doi:10.14478/ace.2021.1053

금속 폼 유로가 고분자전해질 연료전지 성능에 미치는 영향
Metal Foam Flow Field Effect on PEMFC Performance 원문보기

공업화학 = Applied chemistry for engineering, v.32 no.4, 2021년, pp.442 - 448

초록
AI-Helper

고분자전해질 연료전지에서 분리판 유로 형상은 유체 공급과 물 및 열 확산, 접촉 저항 등에 영향을 주는 중요한 요소이다. 본 연구에서는 25 cm² 단위 전지를 이용하여 공기극에 구리폼을 적용한 분리판을 이용하여 연료전지 성능 평가를 수행하였다. 압력과 상대습도 조건에 대한 영향을 분극 곡선과 전기화학적 임피던스 분광법을 이용하여 분석하였다. 구리폼의 ohmic 저항이 높아 사형유로형상 보다 연료전지 성능은 낮았지만, 다공성 구조로 인한 균일한 연료 분포로 활성화 손실과 물질전달 손실이 적은 것을 확인하였다. 구리폼의 소수성이 높아 물 배출이 유리한 장점이 있지만, 저가습 조건에서는 사형유로에 비하여 전해질막 수화도가 낮은 것을 확인하였다. 다공성 금속 분리판은 균일한 압력 분포와 효과적인 수분 배출로 연료전지 성능을 개선할 수 있을 것으로 판단되며, 저항을 최소화할 수 있도록 금속폼의 물성에 대한 연구가 수행되어야 할 것이다.

Abstract ▼ AI-Helper

Flow field is an important parameter for polymer electrolyte membrane fuel cell (PEMFC) performance to have an effect on the reactant supply, heat and water diffusion, and contact resistance. In this study, PEMFC performance was investigated using Cu foam flow field at the cathode of 25 cm2 unit cell. Polarization curve and electrochemical impedance spectroscopy were performed at different pressure and relative humidity conditions. The Cu foam showed lower cell performance than that of serpentine type due to its high ohmic resistance, but lower activation and concentration loss due to the even reactant distribution of porous structure. Cu foam has the advantage of effective water transport because of its hydrophobicity. However, it showed low membrane hydration at low humidity condition. The metal foam flow field could improve fuel cell performance with a uniform pressure distribution and effective water management, so future research on the properties of metal foam should be conducted to reduce electrical resistance of bipolar plate.

주제어

표/그림 (11)

그림 Figure 1. Schematic of flow field (a) serpentine, (b) metal foam.
그림 Figure 2. SEM images of Cu foam (a) cross-section, (b) in-plane.
그림 Figure 3. Contact angles of bipolar plate (a) graphite, (b) Cu foam.
그림 Figure 4. Cell performance with serpentine and Cu foam (a) polarization curve, (b) EIS (c) CV.
그림 Figure 5. Effect of pressure on resistance (a) EIS, (b) resistance at 400 mA/cm².
그림 Figure 6. IR-corrected polarization curve at different pressure (a) ambient pressure (b) 1 bar pressure.
그림 Figure 7. Cell performance with serpentine and Cu foam at low relative humidity (a) polarization curve, (b) EIS at 50% RH, (c) EIS at 25% RH.
그림 Figure 8. Ohmic resistance at different relative humidity with serpentine and Cu foam flow field.
그림 Figure 9. Effect of pressure on fuel cell performance at RH 25% (a) polarization curve, (b) current density at 0.6 V.
그림 Figure 10. EIS under pressurized condition at 25% RH.
표 Table 1. Resistance at Different Relative Humidity, Ambient Pressure

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