채널 내장형 습도 센서를 이용한 고분자 전해질 연료전지의 습도분포 측정

국문 초록 (Abstract)

본 연구는 고분자 전해질 연료전지 (PEMFC)의 성능에 매우 중요한 영향을 미치는 물의 분포를 실험적으로 측정하였다. 내부에서 일어나는 활발한 화학반응과 물질전달 특성 때문에 PEMFC 내부에서 수분의 분포가 불균일하며 그 분포를 실험적으로 측정하기가 용이하지 않아 그 동안 간접적인 측정이 많이 이루어졌다. 본 연구에서는 초소형 온습도 센서를 연료전지의 채널에 직접 삽입하고 채널을 따라 흐르는 반응가스의 습도를 측정하였다. 수소극과 공기극 중 한곳만 가습하며, 가습하지 않은 곳에서 습도를 측정하여 멤브레인을 통한 물의 이동을 연구하였다. 가습기의 온도가 증가할수록 양극의 물농도구배가 커져서 확산이 증가하나 높은 전류밀도에서는 전기삼투항력의 영향이 더욱 커졌다.

다국어 초록 (Multilingual Abstract)

In this study, water distribution inside a proton exchange membrane fuel cell (PEMFC) was measured experimentally. Water distribution is non-uniform because of vigorous chemical reaction and mass transport and has been difficult to measure experimentally. Therefore, much research relied on indirect measuring methods or numerical simulations. In this study, several mini temperature-humidity sensors were installed at the channel for measuring temperature and humidity of the flowing gas throughout the channel. Only one of two electrode channels was humidified externally, and the humidity distribution on the other side was measured, enabling the observation of water transport characteristics under various conditions. Diffusion through the membrane became more vigorous as the temperature of the humidifier rose, but at high current density, electro-osmotic drag became more effective than diffusion.

목차 (Table of Contents)

• 초록
• Abstract
• 1. 서론
• 2. 실험장치 및 실험방법
• 3. 결과 및 토의
• 4. 결론
• 참고문헌(References)

참고문헌 (Reference)

1 Liu, X., "Water Flooding and Two-Phase Flow in Cathode Channels of Proton Exchange Membrane Fuel Cells" 156 : 267-280, 2006

2 Tuber, K., "Visualization of Water Buildup in the Cathode of a Transparent PEM Fuel Cell" 124 : 403-414, 2003

3 Lee, D., "Visualization of Flooding in a Single Cell and Stacks by Using a Newly-designed Transparent PEMFC" 37 : 422-435, 2012

4 Ludlow, D.J., "PEM Fuel Cell Membrane Hydration Measurement by Neutron Imaging" 162 : 271-278, 2006

5 Buchi, F.N., "Operating Proton Exchange Membrane Fuel Cells without External Humidification of the Reactant Gases" 144 : 2767-2772, 1997

6 Park, J., "Neutron Imaging Investigation of Liquid Water Distribution in and the Performance of a PEM Fuel Cell" 33 : 3373-3384, 2008

7 Guvelioglu, G., "Flow Rate and Humidification Effects on a PEM Fuel Cell Performance and Operation" 163 : 882-891, 2007

8 김선회, "Effects of humidity and temperature on a proton exchange membrane fuel cell (PEMFC) stack" 한국공업화학회 14 (14): 357-364, 2008

9 Lee, Y., "Effects of Water Transport and Freezing on the Performance Characteristics of Polymer Electrolyte Fuel Cells" 2009

10 Lee, Y., "Effects of Self-Humidification on the Dynamic Behavior of` Polymer Electrolyte Fuel Cells" 34 : 1999-2007, 2009

11 이용택, "Effects of External Humidification on the Performance of a Polymer Electrolyte Fuel Cell" 대한기계학회 21 (21): 2188-2195, 2007

12 Lee, Y., "An Experimental Study on Water Transport through the Membrane of a PEFC Operating in the Dead-end Mode" 34 : 7768-7779, 2009

13 Gorgun, H., "An Algorithm for Estimation of Membrane Water Content in PEM Fuel Cells" 157 : 389-394, 2006

14 Yuan, X., "AC Impedance Technique in PEM Fuel Cell Diagnosis—A Review" 32 : 4365-4380, 2007