Effect of sulfur as a growth promoter for CNx nanostructures as PEM and DMFC ORR catalysts

被引：31

作者：

Biddinger, Elizabeth J. ^{[1
]}

Knapke, Douglas S. ^{[1
]}

von Deak, Dieter ^{[1
]}

Ozkan, Umit S. ^{[1
]}

机构：

[1] Ohio State Univ, Dept Chem & Biomol Engn, Columbus, OH 43210 USA

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2010年 / 96卷 / 1-2期

关键词：

Nitrogen-containing carbon; ORR catalysts; Fuel cell; Nanostructured carbon; Carbon growth promoters; Sulfur; CNx; OXYGEN REDUCTION REACTION; NITROGEN-CONTAINING CARBON; FE-BASED CATALYSTS; FUEL-CELL CATHODE; SUPPORTED METAL PARTICLES; RING-DISK ELECTRODE; ACTIVE-SITES; O-2; ELECTROREDUCTION; FE/N/C CATALYSTS; H2O2; RELEASE;

D O I：

10.1016/j.apcatb.2010.02.003

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：

The impact of thiophene, a carbon growth promoter, was investigated when added to acetonitrile during pyrolysis over 2 wt%Fe/MgO to form nitrogen-containing carbon nanostructured (CNx) oxygen reduction reaction (ORR) catalysts. ORR activity and selectivity were studied using rotating ring disk electrode (RRDE) electrochemical testing. Catalysts were characterized using XPS, TEM, hydrophobicity testing and BET surface area. It was found that thiophene did increase CNx yield, but did not affect the ORR activity of the resulting catalysts. Characterization results revealed that sulfur was incorporated into the CNx catalyst. Viability of catalysts for use in a PEM or direct methanol fuel cell environment was further investigated using temperature programmed oxidation and desorption (TPO, TPD) techniques to determine the stability of sulfur in CNx catalyst. Post-synthesis treatment to prevent sulfur desorption during long-term use in a fuel cell was found to be feasible. (c) 2010 Elsevier B.V. All rights reserved.

引用

页码：72 / 82

页数：11

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