[논문]Dead ended anode 시스템에서 다공성 유로가 연료전지 성능에 미치는 영향

김준섭; 김준범

doi:10.14478/ace.2022.1107

Dead ended anode 시스템에서 다공성 유로가 연료전지 성능에 미치는 영향
Effect of Porous Flow Field on PEMFC Performance with Dead Ended Anode System 원문보기

공업화학 = Applied chemistry for engineering, v.33 no.6, 2022년, pp.646 - 652

초록
AI-Helper

Dead ended anode (DEA) 시스템은 수소극(anode) 출구를 막고 압력으로 연료를 공급하는 방식이다. DEA 방식은 시스템 단순화를 통해 연료이용효율과 전력 효율을 향상시킬 수 있다. 하지만 DEA 운전 중 공기극(cathode)에서 수소극으로 질소와 물의 역확산으로 인한 범람(flooding)이 발생한다. 이러한 범람 현상은 연료전지 성능 저하와 전극 열화의 주요 요인이 된다. 따라서 DEA 운전 시 범람을 방지하기 위하여 연료전지 구조와 구성요소가 최적화되어야 한다. 본 연구에서는 DEA 시스템에서 연료전지의 성능과 연료이용효율 향상을 위해 발포 금속을 적용한 다공성 유로에 대한 영향을 조사하였다. 그 결과, 공기극에 다공성 유로를 사용한 경우 효과적인 물 관리로 연료전지 성능과 배출 간격(purge interval)이 개선되었고, 이를 통하여 공기극 유로 구조가 물 역확산에 영향을 미치는 것을 확인하였다. 이에 반해 수소극의 다공성 유로가 연료전지 성능에 미치는 영향은 미미하였다. DEA 시스템에서는 발포 금속 물성이 배출 간격에 영향을 미치며 cell 크기가 큰 발포 금속에서 안정적인 성능을 나타내었다.

Abstract ▼ AI-Helper

The dead-end anode (DEA) system is a method that closes the anode outlet and supplies fuel by pressure. The DEA method could improve fuel usage and power efficiency through system simplification. However, flooding occurs due to water and nitrogen back diffusion from the cathode to the anode during the DEA operation. Flooding is a cause of decreased fuel cell performance and electrode degradation. Therefore, tthe structure and components of polymer electrolyte membrane fuel cell (PEMFC) should be optimized to prevent anode flooding during DEA operation. In this study, the effect of a porous flow field with metal foam on fuel cell performance and fuel efficiency improvement was investigated in the DEA system. As a result, fuel cell performance and purge interval were improved by effective water management with a porous flow field at the cathode, and it was confirmed that cathode flow field structure affects water back-diffusion. On the other hand, the effect of the porous flow field at the anode on fuel cell performance was insignificant. Purge interval was affected by metal foam properties and shown stable performance with large cell size metal foam in the DEA system.

주제어

표/그림 (10)

그림 Figure 1. Schematic diagram of fuel supply system (a) flow through anode (FTA) (b) dead ended anode (DEA) (c).
표 Table 1. Physical Properties of Metal Foam
그림 Figure 2. SEM images of metal foam for different cell size (a) 580 um (S1) (b) 3,000 um (S2).
그림 Figure 3. Cell voltage at DEA system (a) purge cycle (b) purge cycle at different current.
그림 Figure 4. Effect of air stoichiometry on purge cycle at 1,200 mA/cm².
그림 Figure 5. Schematic diagram of unit cell with metal foam flow field (a) CaF, (b) AnF.
그림 Figure 6. Effect of flow field configuration on cell performance (S1) (a) IV-curve (b) Nyquist plot at 800 mA/cm².
표 Table 2. Fuel Cell Configuration with Metal Foam and Cell Performance with S1
그림 Figure 7. Effect of metal foam on purge cycle at DEA system (a) S1 (b) S2.
그림 Figure 8. Effect of metal foam cell size on anode flooding at DEA system.

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