Journal ArticleDOI
Iron-based catalysts with improved oxygen reduction activity in polymer electrolyte fuel cells.
TLDR
In this paper, a microporous carbon-supported iron-based catalysts with active sites believed to contain iron cations coordinated by pyridinic nitrogen functionalities in the interstices of graphitic sheets within the micropores was produced.Abstract:
Iron-based catalysts for the oxygen-reduction reaction in polymer electrolyte membrane fuel cells have been poorly competitive with platinum catalysts, in part because they have a comparatively low number of active sites per unit volume. We produced microporous carbon-supported iron-based catalysts with active sites believed to contain iron cations coordinated by pyridinic nitrogen functionalities in the interstices of graphitic sheets within the micropores. We found that the greatest increase in site density was obtained when a mixture of carbon support, phenanthroline, and ferrous acetate was ball-milled and then pyrolyzed twice, first in argon, then in ammonia. The current density of a cathode made with the best iron-based electrocatalyst reported here can equal that of a platinum-based cathode with a loading of 0.4 milligram of platinum per square centimeter at a cell voltage of >/=0.9 volt.read more
Citations
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Journal ArticleDOI
A Copper Porphyrin‐Based Conjugated Mesoporous Polymer‐Derived Bifunctional Electrocatalyst for Hydrogen and Oxygen Evolution
TL;DR: In this paper, the authors reported nitrogen-enriched porous carbon materials containing copper/copper oxide, derived from copper porphyrin-based conjugated mesoporous polymers (CMPs), as a bifunctional catalyst for both HER and OER.
Journal ArticleDOI
Amorphous iron oxide decorated 3D heterostructured electrode for highly efficient oxygen reduction
TL;DR: In this paper, a 5-nm-thick amorphous iron oxide thin film decorated electrode with high electrocatalytic activity comparable to that of the platinum modified one was presented.
Journal ArticleDOI
Cobalt-carbon nanofibers as an efficient support-free catalyst for oxygen reduction reaction with a systematic study of active site formation
MinJoong Kim,Do-Hwan Nam,Hee-Young Park,ChoRong Kwon,KwangSup Eom,Sung Jong Yoo,Jong Hyun Jang,Hyoung-Juhn Kim,EunAe Cho,Hyuk-Sang Kwon +9 more
TL;DR: In this paper, an electrospun cobalt-carbon nanofibers (Co-CNFs) was used as an efficient catalyst for the oxygen reduction reaction (ORR) in fuel cells for large-scale applications.
Journal ArticleDOI
Non-noble Fe–NX electrocatalysts supported on the reduced graphene oxide for oxygen reduction reaction
TL;DR: In this paper, the reduced graphene oxide (rGO) is synthesized from graphite oxide (GO) via microwave exfoliation method, and used to support non-noble metal Fe-NX based electrocatalysts (Fe−NX/ rGO) for the oxygen reduction reaction (ORR).
Journal ArticleDOI
Mesoporous carbons supported non-noble metal Fe-NX electrocatalysts for PEM Fuel Cell oxygen reduction reaction
Alessandro Hugo Monteverde Videla,Lei Zhang,Jenny Kim,Juqin Zeng,Carlotta Francia,Jiujun Zhang,Stefania Specchia +6 more
TL;DR: In this article, three types of iron-nitrogen-containing non-noble metal catalysts, supported on an ultrasonic spray pyrolysis mesoporous carbon (USPMC), a hollow core mesophorous shell carbon (HCMSC), and a standard carbon (Ketjen Black CJ600, KB), respectively, are synthesized using a wet-impregnation method.
References
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Journal ArticleDOI
Activity benchmarks and requirements for Pt, Pt-alloy, and non-Pt oxygen reduction catalysts for PEMFCs
TL;DR: In this article, the authors quantified the activities and voltage loss modes for state-of-the-art MEAs (membrane electrode assemblies), specifies performance goals needed for automotive application, and provides benchmark oxygen reduction activities for state of the art platinum electrocatalysts.
Journal ArticleDOI
A class of non-precious metal composite catalysts for fuel cells
Rajesh Bashyam,Piotr Zelenay +1 more
TL;DR: The results of this study show that heteroatomic polymers can be used not only to stabilize the non-precious metal in the acidic environment of the PEFC cathode but also to generate active sites for oxygen reduction reaction.
Journal ArticleDOI
A New Fuel Cell Cathode Catalyst
TL;DR: The use of metal phthalocyanines as catalysts for the oxidation of organic compounds has been described in the literature as mentioned in this paper, and a number of these reports were tested as cathode catalysts in fuel cells.
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Dependence of PEM fuel cell performance on catalyst loading
TL;DR: In this paper, a determination of the cell voltage losses observed for Pt and PtRu loading reductions in H2/air and reformate/air polymer/electrolyte-membrane fuel cells (PEMFC) is presented.
Journal ArticleDOI
Heat-treated polyacrylonitrile-based catalysts for oxygen electroreduction
TL;DR: In this paper, a polyacrylonitrile (PAN) mixed with Co(II) or Fe(2) salts and high-area carbon and then heat treated, has been found to yield very promising catalysts for O2 reduction in concentrated alkaline and acid solutions.