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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Enhanced Electrocatalysis via 3D Graphene Aerogel Engineered with a Silver Nanowire Network for Ultrahigh-Rate Zinc–Air Batteries
Hu Shang,Ting Han,Ting Han,Chao Lin,Weikai Xiang,Yonghui Zhao,Peng Gao,Du Fuping,Xiaopeng Li,Yuhan Sun,Yuhan Sun +10 more
TL;DR: In this article, a facile approach involving in situ integration of 1D silver nanowire (AgNW) during gelation of graphene oxide flakes is presented, which prevents the restacking of graphene sheets and act as an efficient electron highway and Ag source for deposition of ultrasmall Ag nanocrystals (AgNCs).
Journal ArticleDOI
Structural Evolution of Phosphorus Species on Graphene with a Stabilized Electrochemical Interface.
Zhihong Bi,Li Huo,Qingqiang Kong,Feng Li,Jing-Peng Chen,Aziz Ahmad,Xianxian Wei,Lijing Xie,Cheng-Meng Chen +8 more
TL;DR: In this work, two-dimensional graphene, as a simplified model for all sp2 hybrid carbon allotropes, is employed to explore the surface chemistry of P-doped carbon materials and identifies the C3-P═O configuration as the most stable structure in the graphene lattice and plays a key role in stabilizing the electrochemical interface between the electrode and electrolyte.
Journal ArticleDOI
In situ soft X-ray absorption spectroscopy investigation of electrochemical corrosion of copper in aqueous NaHCO3 solution
Peng Jiang,Peng Jiang,Jeng-Lung Chen,Jeng-Lung Chen,Ferenc Borondics,Per-Anders Glans,Mark W. West,Chinglin Chang,Miquel Salmeron,Miquel Salmeron,Jinghua Guo +10 more
TL;DR: In this article, a novel electrochemical setup has been developed for soft x-ray absorption studies of the electronic structure of electrode materials during electrochemical cycling, which opens the way for in situ investigations of electrochemical processes, photovoltaics, batteries, fuel cells, water splitting, corrosion, electrodeposition and a variety of important biological processes.
Journal ArticleDOI
Bioinspired Transition-Metal Complexes as Electrocatalysts for the Oxygen Reduction Reaction.
TL;DR: An outline into recent progress on non-precious-metal electrocatalysts for the ORR is provided, focusing on iron/cobalt macrocycles and copper complexes in which the OrR activity is tuned by ligand variation/substitution, the method of catalyst immobilization, and the underlying supporting materials.
Journal ArticleDOI
Synthesis of highly-active Fe–N–C catalysts for PEMFC with carbide-derived carbons
Sander Ratso,Nastaran Ranjbar Sahraie,Moulay Tahar Sougrati,Maike Käärik,Mati Kook,Rando Saar,Päärn Paiste,Qingying Jia,Jaan Leis,Sanjeev Mukerjee,Frédéric Jaouen,Kaido Tammeveski +11 more
TL;DR: In this article, the authors compared two sets of Fe-N-C catalysts derived from two different carbide-derived carbon (CDC-2) and another one with most frequent pore sizes at 7.8 and 30 A.
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.
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.