Determination of mass diffusion overpotential distribution with flow pulse method from current distribution measurements in a PEMFC

被引：41

作者：

Noponen, M ^{[1
]}

Hottinen, T ^{[1
]}

Mennola, T ^{[1
]}

Mikkola, M ^{[1
]}

Lund, P ^{[1
]}

机构：

[1] Aalto Univ, Lab Adv Energy Syst, Espoo 02015, Finland

来源：

JOURNAL OF APPLIED ELECTROCHEMISTRY | 2002年 / 32卷 / 10期

关键词：

current distribution; free-breathing cathode; mass diffusion overpotential distribution; PEMFC; resistance distribution;

D O I：

10.1023/A:1021250418645

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The mass diffusion overpotential distribution in a free-breathing proton exchange membrane fuel cell (PEMFC) was determined from current distribution measurements using a flow pulse approach. The current distribution measurements were conducted with a segmented flow-field plate. Flow pulses were fed to the cathode channels to form a uniform oxygen concentration distribution along the channels. Simultaneously, the cell resistance was monitored using the current interruption method. From the experimental data, the mass diffusion overpotential distribution was calculated using the Tafel equation. The results show that the mass diffusion overpotential in different parts of the cell may vary considerably, for example, at 180 mA cm(-2) the mass diffusion overpotential difference between the bottom and top part of the cell was 0.1 V.

引用

页码：1081 / 1089

页数：9

共 12 条

[1] Measurement of the current distribution along a single flow channel of a solid polymer fuel cell [J].