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
Synthesis and characterization of carbon-supported transition metal oxide nanoparticles — Cobalt porphyrin as catalysts for electroreduction of oxygen in acids
TL;DR: In this article, an unpyrolyzed, non-noble metal catalysts for oxygen reduction were obtained using a two-step procedure, which consisted of a synthesis of carbon-supported transition metal nanoparticles, followed by adsorption of cobalt porphyrin (CoP).
Journal ArticleDOI
Constructing N-Doped porous carbon confined FeSb alloy nanocomposite with Fe-N-C coordination as a universal anode for advanced Na/K-ion batteries
Zhiyuan Wang,Kangze Dong,Dan Wang,Shaohua Luo,Xin Liu,Yanguo Liu,Qing Wang,Yahui Zhang,Aimin Hao,Chunnian He,Chunsheng Shi,Naiqin Zhao +11 more
TL;DR: In this paper, a novel N-doped three-dimensional porous carbon network confined nanosized FeSb alloy composite with a strong Fe-N-C bond was designed and fabricated, this unique structure sufficiently relieves the volume change of Sb during cycling, reduces the diffusion length for both ion/electrons, enhances the electronic conductivity, and provides abundant active sites for Na+/K+ storage.
Journal ArticleDOI
Nanoporous carbon derived from a functionalized metal-organic framework as a highly efficient oxygen reduction electrocatalyst.
TL;DR: The porous carbon materials derived from MOF-253 by using a step-by-step post-synthetic modification strategy demonstrate excellent ORR activity, high selectivity, and stability under both alkaline and acidic conditions.
Journal ArticleDOI
A metal–organic framework devised Co–N doped carbon microsphere/nanofiber hybrid as a free-standing 3D oxygen catalyst
TL;DR: A Co-N doped 3D carbon microsphere/nanofiber hybrid was produced by electrospinning and shows Pt-like oxygen reduction reaction activity both in acidic and basic solutions, making it one of the best non-noble metal oxygen catalysts.
Journal ArticleDOI
2D Layered non-precious metal mesoporous electrocatalysts for enhanced oxygen reduction reaction
TL;DR: In this paper, the meso-Fe-N-C/N-G electrocatalyst showed super electrocatalytic performance for oxygen reduction reaction (ORR), and its catalytic activity and durability were superior to those of Pt/C.
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.
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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.
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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.
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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.