Mechanistic studies of oxygen reduction on Fe-PEI derived non-PGM electrocatalysts

被引：62

作者：

Serov, Alexey ^{[1
]}

Tylus, Urszula ^{[2
]}

Artyushkova, Kateryna ^{[1
]}

Mukerjee, Sanjeev ^{[2
]}

Atanassov, Plamen ^{[1
]}

机构：

[1] Univ New Mexico, Univ New Mexico 1, Dept Chem & Nucl Engn, Albuquerque, NM 87131 USA

[2] Northeastern Univ, Dept Chem & Chem Technol, Boston, MA 02115 USA

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2014年 / 150卷

关键词：

Non-PGM; Cathode catalysts; Fuel cell; Mechanism; METHANOL FUEL-CELLS; CATHODE CATALYST; PYROLYZED PORPHYRINS; ALKALINE MEDIA; IRON; ELECTROOXIDATION; ORR; ELECTROREDUCTION; CHALCOGENIDE; PERFORMANCE;

D O I：

10.1016/j.apcatb.2013.12.009

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Mechanistic studies of oxygen reduction reaction (ORR) on electrocatalysts derived from the pyrolysis of iron salts and polyethyleneimine (PEI) were performed in acidic and alkaline media. The prepared materials have been characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET) surface area analysis, and rotating ring-disk electrode (RRDE) methods. Systematic studies of catalyst loading on working electrode allowed establishing a working range suitable for mechanistic studies. It was found that the overall mechanism of ORR in acid electrolyte is not identical with that in alkaline media indicating complex interplay. The dependence of electron transfer numbers on catalyst loading indicates 2 x 2e(-) mechanism. The analysis of the Tafel plots corresponding to electrode polarizations have demonstrated difference of the reaction rate limiting steps in alkaline and acid media. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：179 / 186

页数：8

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