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Three-dimensional multi-phase model of PEM fuel cell coupled with improved agglomerate sub-model of catalyst layer

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journal contribution
posted on 25.11.2019 by Biao Xie, Guobin Zhang, Jin Xuan, Kui Jiao
© 2019 Elsevier Ltd An improved agglomerate sub-model of catalyst layer (CL) involving actual agglomerate size and oxygen local transport characteristics is developed and incorporated into a three-dimensional (3D) multi-phase model of proton exchange membrane (PEM) fuel cell. This makes it capable to consider the effect of platinum (Pt) loading on oxygen transport and fuel cell performance more accurately. Oxygen local transport resistance near the catalyst surface is divided into three parts caused by liquid water blockage, ionomer coverage and Pt/carbon agglomeration, respectively. The resistances caused by ionomer coverage and Pt/carbon agglomeration are two major sources of oxygen local transport resistance. They have opposite variation trends as Pt loading changes. However, the ionomer resistance increases dramatically when Pt loading is lower than 0.1 mg cm−2 because of the much harder transport process through a relatively heavier ionomer coating. The simulation results agree with the experimental data reasonably under different cathode Pt loadings (from 0.3 to 0.025 mg cm−2), for both polarization curves and local transport resistance. In addition, a transport dominance parameter is defined to judge whether the concentration loss predominates the electrochemical reaction. A value greater than 10% can be seen as a symbol of local oxygen starvation. Using this model, fine channel geometry with extremely small channel and rib widths is investigated, and the highest net output power in this study is corresponding to 0.2 and 0.6 mm for channel (rib) width and height.

Funding

National Key Research and Development Program of China (Grant No. 2017YFB0102703),

National Natural Science Foundation of China for International Cooperation and Exchange (Newton Advanced Fellowship) (Grant No. 51861130359, NAF\R1\180146)

National Natural Science Foundation of Tianjin (China) for Distinguished Young Scholars (Grant No. 18JCJQJC46700)

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

Energy Conversion and Management

Volume

199

Publisher

Elsevier BV

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal Energy Conversion and Management and the definitive published version is available at https://doi.org/10.1016/j.enconman.2019.112051

Acceptance date

08/09/2019

Publication date

2019-09-14

Copyright date

2019

ISSN

0196-8904

eISSN

1879-2227

Language

en

Depositor

Prof Jin Xuan . Deposit date: 22 November 2019

Article number

112051

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