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
More filters
Journal ArticleDOI
Iron-embedded boron nitride nanosheet as a promising electrocatalyst for the oxygen reduction reaction (ORR): A density functional theory (DFT) study
TL;DR: In this article, a comprehensive density functional theory (DFT) calculation was performed to explore the possibility of the Fe-embedded hexagonal boron nitride ( h -BN) sheet as a novel electrocatalyst for ORR.
Journal ArticleDOI
The impact of widespread deployment of fuel cell vehicles on platinum demand and price
TL;DR: In this paper, the authors estimate the total cost of future fuel cell vehicles considering the impact of worldwide introduction of hydrogen FCVs on platinum loading, platinum demand and price, and find that the overall the cost per FCV declines by almost 80%, from current values of about $2200 to about $500 in 2045.
Journal ArticleDOI
Modeling Fe/N/C Catalysts in Monolayer Graphene
Xiaodong Yang,Yanping Zheng,Jing Yang,Wei Shi,Jin-Hui Zhong,Cankun Zhang,Xue Zhang,Yu-Hao Hong,Xin-Xing Peng,Zhi-You Zhou,Shi-Gang Sun +10 more
TL;DR: In this article, a single-atomic-layer Fe/N/C model catalyst based on monolayer graphene (FeN-MLG) was designed to explore the active sites.
Journal ArticleDOI
Fe3C nanoparticle decorated Fe/N doped graphene for efficient oxygen reduction reaction electrocatalysis
TL;DR: In this paper, a facile synthesis of mesoporous Fe/N-doped graphene with encapsulated Fe3C nanoparticles (Fe3C@Fe/N)-graphene was reported.
Journal ArticleDOI
Fe-N-carbon black for the oxygen reduction reaction in sulfuric acid
Hui Xiao,Hui Xiao,Zhigang Shao,Geng Zhang,Geng Zhang,Yuan Gao,Yuan Gao,Wangting Lu,Wangting Lu,Baolian Yi +9 more
TL;DR: In this paper, a Fe-N-C catalyst was prepared by pyrolyzing carbon black supported Fe-imidazole complexes and the effect of different pyrolyssis temperatures on the catalysts' oxygen reduction reaction (ORR) activity was investigated by electrochemical rotating disk electrode tests in 0.5 M H2SO4.
References
More filters
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.
Journal ArticleDOI
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.