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
Design Strategies toward Advanced MOF-Derived Electrocatalysts for Energy-Conversion Reactions
TL;DR: In this article, materials design strategies for constructing improved electrocatalysts based on MOF precursors/templates, with special emphasis on component manipulation, morphology control, and structure engineering, are presented.
Journal ArticleDOI
Recent progress on nitrogen/carbon structures designed for use in energy and sustainability applications
TL;DR: A comprehensive overview of advances in the last half decade on state-of-the-art carbon modification with nitrogen heteroatoms can be found in this paper, where the benefits and effects of nitrogen modification for specific applications in the energy and environmental fields are reviewed.
Journal ArticleDOI
Heteroatom-Doped Graphitic Carbon Catalysts for Efficient Electrocatalysis of Oxygen Reduction Reaction
Jintao Zhang,Liming Dai +1 more
TL;DR: In this paper, a new class of heteroatom-doped metal-free carbon catalysts has been developed, which, as alternative ORR catalysts, could dramatically reduce the cost and increase the efficiency of fuel cells and metal-air batteries.
Journal ArticleDOI
Carbonized nanoscale metal-organic frameworks as high performance electrocatalyst for oxygen reduction reaction.
Shenlong Zhao,Huajie Yin,Lei Du,Liangcan He,Kun Zhao,Lin Chang,Geping Yin,Huijun Zhao,Shaoqin Liu,Zhiyong Tang +9 more
TL;DR: In this paper, carbonized nanoparticles, derived from monodisperse nanoscale metal organic frameworks (MIL-88B-NH3), were used as the high performance ORR catalysts.
Journal ArticleDOI
Metal (Ni, Co)‐Metal Oxides/Graphene Nanocomposites as Multifunctional Electrocatalysts
Xien Liu,Wen Liu,Minseong Ko,Minjoon Park,Min Gyu Kim,Pilgun Oh,Suhyeon Chae,Suhyeon Park,Anix Casimir,Gang Wu,Jaephil Cho +10 more
TL;DR: In this paper, a new class of multifunctional electrocatalysts consisting of dominant metallic Ni or Co with small fraction of their oxides anchored onto nitrogen-doped reduced graphene oxide (rGO) including Co-CoO/N-rGO and Ni-NiO/Ni-N-RGO were prepared via a pyrolysis of graphene oxide and cobalt or nickel salts.
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.