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
Apically Co-nanoparticles-wrapped nitrogen-doped carbon nanotubes from a single-source MOF for efficient oxygen reduction
TL;DR: In this article, a single-source dicyanamide-based Co-MOF was used to prepare cobalt nanoparticles-wrapped bamboo-like nitrogen-doped carbon nanotubes (Co@BNCNTs) by a short-term pyrolysis at a lower temperature (as low as 700 °C).
Journal ArticleDOI
Recent Advancements in Transition Metal-Nitrogen-Carbon Catalysts for Oxygen Reduction Reaction
Journal ArticleDOI
Electrospun Iron–Polyaniline–Polyacrylonitrile Derived Nanofibers as Non–Precious Oxygen Reduction Reaction Catalysts for PEM Fuel Cells
Pouyan Zamani,Drew Higgins,Fathy M. Hassan,Gaopeng Jiang,Jason Wu,Salah Abureden,Zhongwei Chen +6 more
TL;DR: In this paper, one-dimensional nanofibers are prepared by electrospinning an iron-polyaniline/polyacrylonitrile (Fe-PANI-PAN) metal-polymer blend, followed by subsequent heat treatment.
Journal ArticleDOI
NiCo-doped C-N nano-composites for cathodic catalysts of Zn-air batteries in neutral media
TL;DR: In this article, a facile preparation of NiCo-doped C-N nano-composite catalysts (NiCo/C-N) from direct pyrolysis of Ni/Co salt, polyaniline (PANI), carbon nanotube (CNT), and dicyandiamide was reported.
Journal ArticleDOI
SiO2-Fe/N/C catalyst with enhanced mass transport in PEM fuel cells
Xiaohua Yang,Yu-Cheng Wang,Yu-Cheng Wang,Gaixia Zhang,Lei Du,Lijun Yang,Matthew Markiewicz,Ja-Yeon Choi,Régis Chenitz,Shuhui Sun +9 more
TL;DR: In this paper, a SiO2-Fe/N/C nanoparticle chains were employed to adjust the mesoporous structure and wettability (i.e., making the catalyst surface more hydrophobic), in order to enhance the mass-transport properties of the catalyst layer.
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.
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.