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
Dyeing bacterial cellulose pellicles for energetic heteroatom doped carbon nanofiber aerogels
TL;DR: In this paper, a new strategy was proposed to fabricate various doped carbon nanofiber (CNF) aerogels by pyrolysis of bacterial cellulose (BC) pellicles which had adsorbed or were dyed with different toxic organic dyes.
Journal ArticleDOI
Graphene-templated synthesis of palladium nanoplates as novel electrocatalyst for direct methanol fuel cell
TL;DR: In this paper, the shape-controlled synthesis of palladium nanocrystals supported on the surface of graphene is of great importance in designing an electrocatalyst for direct methanol fuel cells.
Journal ArticleDOI
N-doped graphene/carbon composite as non-precious metal electrocatalyst for oxygen reduction reaction
TL;DR: In this paper, a non-precious metal electrocatalyst based on nitrogen-doped graphene (NG) was synthesized through a single step heat-treatment of a precursor mixture containing graphene oxide, urea, carbon black (CB) and small amount of iron species.
Journal ArticleDOI
Electrocatalytic oxygen reduction kinetics on Fe-center of nitrogen-doped graphene
TL;DR: This work identifies the four (4e) and two electron (2e) oxygen reduction pathways under acidic conditions and finds that both 4e and 2e pathways involves the formation of an OOH intermediate, which breaks its O-OH bond in the 4e pathway but is reduced to H2O2 in the 2e pathway.
Journal ArticleDOI
High‐Performance Nanofiber Fuel Cell Electrodes
Wenjing Zhang,Peter N. Pintauro +1 more
TL;DR: This study presents results on a nanofiber-structured oxygen reduction fuel cell cathode that was prepared by electrospinning a solution containing catalyst powder and polymer binder, and exhibited outstanding stability in a voltage cycling accelerated degradation test.
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.