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Salihi, Hassan
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article
Enhancing Heat Removal and H<sub>2</sub>O Retention Capability of Passive Air-Cooled Polymer Electrolyte Membrane Fuel Cells by Tailoring Cathode Flow-Field Design
Abstract
<jats:p>This paper reports novel cathode flow-field designs for passive typed air-cooled polymer electrolyte membrane fuel cells (PEMFCs) to help alleviate electrolyte dehydration and performance degradation issues under excess dry air supply conditions. The proposed flow-field designs include 7 three-dimensional (3D) patterned designs in addition to a parallel channel configuration equipped with rectangular baffles to control the airflow for more efficient heat removal. The designs were evaluated numerically using 3D, two-phase PEMFC simulations. Compared to a typical parallel flow channel configuration, the proposed flow-field designs show better heat removal and water retention capability. The improvement in single cell voltage was around 13–75 mV at an operating current density of 0.5 A cm<jats:sup>−2</jats:sup>, whereas the larger pressure drops around <jats:inline-formula><jats:tex-math> <?CDATA ${x02206}P$?> </jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mo>∆</mml:mo><mml:mi>P</mml:mi></mml:math><jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="jesac9ee0ieqn1.gif" xlink:type="simple" /></jats:inline-formula> = 6.9–317.6 Pa cm<jats:sup>−1</jats:sup> were required because of the more complex flow-field configurations compared to the simple straight parallel channel geometry (<jats:inline-formula><jats:tex-math> <?CDATA ${x02206}P$?> </jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mo>∆</mml:mo><mml:mi>P</mml:mi></mml:math><jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="jesac9ee0ieqn2.gif" xlink:type="simple" /></jats:inline-formula> = 7.4 Pa cm<jats:sup>−1</jats:sup>). This work presents a comprehensive understanding of air-cooled PEMFC operating characteristics under excessive dry air supply conditions and a new design strategy for cathode flow-fields.</jats:p>