Isothermal Cold Start of Polymer Electrolyte Fuel Cells
Open Access
- 1 January 2007
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 154 (2), B147-B152
- https://doi.org/10.1149/1.2402124
Abstract
Experimental procedures, aimed at elucidating fundamentals of polymer electrolyte fuel cell startup from subzero temperatures, are reported. A method of equilibrium purge using partially humidified gas with well-controlled relative humidity is introduced to effectively control initial water distribution inside a cell prior to cold start. Isothermal cold start, in which single cells with sufficiently large thermal mass are used to fix the cell temperature constant at the startup ambient temperature, is proposed to study intrinsic cold start capability of the membrane-electrode assembly. The proton conductivity of membranes with low water content and at subzero temperatures is measured in situ. The cumulative product water in mg∕cm2mg∕cm2 has been used to quantify performance of isothermal cold start and is shown to exhibit a nonlinear relationship with the membrane water uptake potential, defined as the difference between the membrane hydration water content and initial value prior to cold start. It is found that the membrane is a key component to enhance the intrinsic capability of isothermal cold start from −30°C−30°C . Finally, when the current density is high, the pore volume of the cathode catalyst layer is not fully utilized for ice storage, thereby decreasing cold start performance.Keywords
This publication has 10 references indexed in Scilit:
- Analysis of Cold Start in Polymer Electrolyte Fuel CellsJournal of the Electrochemical Society, 2007
- Low temperature operation and influence parameters on the cold start ability of portable PEMFCsJournal of Power Sources, 2006
- In Situ Imaging of Liquid Water and Ice Formation in an Operating PEFC during Cold StartElectrochemical and Solid-State Letters, 2006
- Quantification of Liquid Water Saturation in a PEM Fuel Cell Diffusion Medium Using X-ray MicrotomographyElectrochemical and Solid-State Letters, 2006
- Statistic analysis of operational influences on the cold start behaviour of PEM fuel cellsJournal of Power Sources, 2005
- Effects of Deep Temperature Cycling on Nafion® 112 Membranes and Membrane Electrode AssembliesFuel Cells, 2004
- The Design and Performance of a PEFC at a Temperature Below FreezingJSME International Journal Series B, 2004
- Effects of Water Removal on the Performance Degradation of PEMFCs Repetitively Brought to <0°CJournal of the Electrochemical Society, 2004
- Characteristics of the PEMFC Repetitively Brought to Temperatures below 0°CJournal of the Electrochemical Society, 2003
- Polymer Electrolyte Fuel Cell ModelJournal of the Electrochemical Society, 1991