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Open AccessArticle

Highly Active Non-PGM Catalysts Prepared from Metal Organic Frameworks

1
Chemical Science and Engineering Division, Argonne National Laboratory, Argonne, IL 60439, USA
2
Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Minhua Shao
Catalysts 2015, 5(2), 955-965; https://doi.org/10.3390/catal5020955
Received: 11 May 2015 / Revised: 5 June 2015 / Accepted: 5 June 2015 / Published: 11 June 2015
(This article belongs to the Special Issue Electrocatalysis in Fuel Cells)
Finding inexpensive alternatives to platinum group metals (PGMs) is essential for reducing the cost of proton exchange membrane fuel cells (PEMFCs). Numerous materials have been investigated as potential replacements of Pt, of which the transition metal and nitrogen-doped carbon composites (TM/Nx/C) prepared from iron doped zeolitic imidazolate frameworks (ZIFs) are among the most active ones in catalyzing the oxygen reduction reaction based on recent studies. In this report, we demonstrate that the catalytic activity of ZIF-based TM/Nx/C composites can be substantially improved through optimization of synthesis and post-treatment processing conditions. Ultimately, oxygen reduction reaction (ORR) electrocatalytic activity must be demonstrated in membrane-electrode assemblies (MEAs) of fuel cells. The process of preparing MEAs using ZIF-based non-PGM electrocatalysts involves many additional factors which may influence the overall catalytic activity at the fuel cell level. Evaluation of parameters such as catalyst loading and perfluorosulfonic acid ionomer to catalyst ratio were optimized. Our overall efforts to optimize both the catalyst and MEA construction process have yielded impressive ORR activity when tested in a fuel cell system. View Full-Text
Keywords: non-PGM catalyst; proton exchange membrane fuel cell (PEMFC); oxygen reduction reaction (ORR); zeolitic imidazolate framework (ZIF) non-PGM catalyst; proton exchange membrane fuel cell (PEMFC); oxygen reduction reaction (ORR); zeolitic imidazolate framework (ZIF)
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Barkholtz, H.M.; Chong, L.; Kaiser, Z.B.; Xu, T.; Liu, D.-J. Highly Active Non-PGM Catalysts Prepared from Metal Organic Frameworks. Catalysts 2015, 5, 955-965.

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