Cerium Migration in Polymer Electrolyte Membranes

被引：14

作者：

Baker, A. M. ^{[1
,2
]}

Mukundan, R. ^{[1
]}

Spernjak, D. ^{[1
]}

Advani, S. G. ^{[2
]}

Prasad, A. K. ^{[2
]}

Borup, R. L. ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[2] Univ Delaware, Newark, DE 19716 USA

来源：

POLYMER ELECTROLYTE FUEL CELLS 16 (PEFC 16) | 2016年 / 75卷 / 14期

关键词：

D O I：

10.1149/07514.0707ecst

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Cerium migration was induced in polymer electrolyte membranes (PEMs) and subsequently characterized using X-ray fluorescence. The effects of proton flux and relative humidity on cerium migration were evaluated using H-2 pump operation in a standard conductivity cell. After 6 Coulombs of charge transfer, cerium in the region between the cell electrodes was reduced by > 75% and was increased in the region under the counter electrode by a factor of 8. In addition to charge transfer, a secondary PEM hydration effect is discussed. Proton/water flux resulted in rapid migration compared to the effects of concentration gradients. Reversible migration is also demonstrated in an uncatalyzed PEM, however, the presence of catalyst layers results in cerium stabilization in the electrodes.

引用

页码：707 / 714

页数：8

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