Experimental investigation and mathematical modeling of triode PEM fuel cells

被引：5

作者：

Martino, E. ^{[1
]}

Koilias, G. ^{[1
]}

Athanasiou, M. ^{[1
]}

Katsaounis, A. ^{[1
]}

Dimakopoulos, Y. ^{[1
]}

Tsamopoulos, J. ^{[1
]}

Vayenas, C. G. ^{[1
,2
]}

机构：

[1] Univ Patras, Dept Chem Engn, Caratheodory 1 St, GR-26504 Patras, Greece

[2] Acad Athens, Panepistimiou 28 Ave, GR-10679 Athens, Greece

来源：

ELECTROCHIMICA ACTA | 2017年 / 248卷

关键词：

Nafion membrane; PEM fuel cell; Triode operation; CO poisoning; Nernst-Planck equation; PROTON DIFFUSION; CONDUCTIVITY; MEMBRANE; NAFION; PERFORMANCE; OPERATION; OXIDATION;

D O I：

10.1016/j.electacta.2017.07.168

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The triode operation of humidified PEM fuel cells has been investigated both with pure H-2 and with CO poisoned H-2 feed over commercial Vulcan supported Pt(30%)-Ru(15%) anodes. It was found that triode operation, which involves the use of a third, auxiliary, electrode, leads to up to 400% power output increase with the same CO poisoned H-2 gas feed. At low current densities, the power increase is accompanied by an increase in overall thermodynamic efficiency. A mathematical model, based on Kirchhoff's laws, has been developed which is in reasonably good agreement with the experimental results. In order to gain some additional insight into the mechanism of triode operation, the model has been also extended to describe the potential distribution inside the Nafion membrane via the numerical solution of the Nernst-Planck equation. Both model and experiment have shown the critical role of minimizing the auxiliary-anode or auxiliary-cathode resistance, and this has led to improved comb-shaped anode or cathode electrode geometries. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：518 / 533

页数：16

共 25 条

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