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
S‐Doping of an Fe/N/C ORR Catalyst for Polymer Electrolyte Membrane Fuel Cells with High Power Density
Yu-Cheng Wang,Yu-Jiao Lai,Lin Frank Song,Zhi-You Zhou,Jianguo Liu,Qiang Wang,Xiaodong Yang,Chi Chen,Chi Chen,Wei Shi,Yanping Zheng,Muhammad Rauf,Shi-Gang Sun +12 more
TL;DR: An improved Fe/N/C catalyst derived from Fe(SCN)3, poly-m-phenylenediamine, and carbon black is presented, which exhibits excellent ORR activity and the maximal power density could exceed 1 W cm(-2).
Journal ArticleDOI
Highly selective oxygen reduction to hydrogen peroxide on transition metal single atom coordination.
Kun Jiang,Seoin Back,Austin Akey,Chuan Xia,Yongfeng Hu,Wentao Liang,Diane Schaak,Eli Stavitski,Jens K. Nørskov,Jens K. Nørskov,Samira Siahrostami,Samira Siahrostami,Haotian Wang,Haotian Wang +13 more
TL;DR: An iron single atom catalyst is reported that can convert oxygen into hydrogen peroxide with a selectivity of above 95% in both alkaline and neutral pH and demonstrated an effective water disinfection as a representative application.
Journal ArticleDOI
Bimetal–Organic Framework Self-Adjusted Synthesis of Support-Free Nonprecious Electrocatalysts for Efficient Oxygen Reduction
TL;DR: In this article, a support-free porous Co-N-C nanopolyhedron electrocatalysts were synthesized by pyrolysis of a Zn/Co bi-MOF without any post-treatments.
Journal ArticleDOI
Density functional studies of functionalized graphitic materials with late transition metals for oxygen reduction reactions
TL;DR: It is shown that graphitic materials with active sites composed of 4 nitrogen atoms and transition metal atoms belonging to groups 7 to 9 in the periodic table are active towards ORR, and also towards Oxygen Evolution Reaction (OER) and that these catalysts trend-wise behave as oxides.
Journal ArticleDOI
High-Performance Electrocatalysts for Oxygen Reduction Derived from Cobalt Porphyrin-Based Conjugated Mesoporous Polymers
Zhong-Shuai Wu,Long Chen,Junzhi Liu,Khaled Parvez,Hai-Wei Liang,Jie Shu,Hermann Sachdev,Robert Graf,Xinliang Feng,Klaus Müllen +9 more
TL;DR: A cobalt-nitrogen-doped porous carbon that exhibits a ribbon-shape morphology, high surface area, mesoporous structure, and high nitrogen and cobalt content is fabricated for high-performance self-supported oxygen reduction electrocatalytsts through template-free pyrolysis of cobalt porphyrin-based conjugated mesoporus polymer frameworks.
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.