Degradation of Platinum-Cobalt Alloy PEMFC Cathode Catalysts in Catalyst-Ionomer Inks

被引：18

作者：

Myers, Deborah J. ^{[1
]}

Kropf, A. Jeremy ^{[1
]}

Wegener, Evan C. ^{[1
]}

Mistry, Hemma ^{[1
]}

Kariuki, Nancy ^{[1
]}

Park, Jaehyung ^{[1
]}

机构：

[1] Argonne Natl Lab, Chem Sci & Engn Div, Lemont, IL 60439 USA

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2021年 / 168卷 / 04期

关键词：

PEMFC catalyst durability; PtCo alloy cathode catalyst; PEMFC fabrication; Oxygen reduction reaction catalyst; Pt alloy catalyst inks; OXYGEN REDUCTION REACTION; MEMBRANE FUEL-CELLS; X-RAY-SCATTERING; NANOPARTICLES; PERFORMANCE; IMPACT;

D O I：

10.1149/1945-7111/abf4ab

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

In this paper we report on studies of the effects of catalyst-ionomer ink composition: ionomer equivalent weight (EW), ink solvent, and ink mixing on a commercial PtCo alloy PEMFC cathode catalyst. X-ray absorption spectroscopy (XAS) and wide-angle X-ray scattering (WAXS) are utilized to determine catalyst atomic structure, catalyst crystallite composition, and extent of loss of Co into the ionomer-solvent phase. Three different n-propanol to water weight ratios (7:3, 5:5, and 3:7) and two different ionomers (3 M 800 EW and Nafion 1000 EW) were studied. Cobalt loss from the PtCo particles was found to increase with increasing water content in the inks and to be more extensive for the 800 EW ionomer inks, causing loss of contraction of the PtCo lattice and formation of a Pt shell-PtCo alloy core intraparticle structure.

引用

页数：9

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