In Search for Structure of Active Site in Iron-Based Oxygen Reduction Electrocatalysts

2006 ◽  
Vol 110 (9) ◽  
pp. 4179-4185 ◽  
Author(s):  
Manish Jain ◽  
Shih-hung Chou ◽  
Allen Siedle
Keyword(s):  
Oxygen Reduction ◽  
Active Site ◽  
Iron Based

Active site engineering of atomically dispersed transition metal-heteroatom-carbon catalysts for oxygen reduction

2021 ◽  
Author(s):  
Jiawei Zhu ◽  
Shichun Mu
Keyword(s):  
Transition Metal ◽  
Oxygen Reduction ◽  
Active Site ◽  
Catalytic Reactions ◽  
Single Atom ◽  
Carbon Catalysts

Owing to the advantage of atomic utilization, the single-atom catalyst has attracted much attention and been employed in multifarious catalytic reactions. Their definite site configuration is favorable for exploring the...

Iron-Based Catalysts with Improved Oxygen Reduction Activity in Polymer Electrolyte Fuel Cells

Science ◽  
2009 ◽  
Vol 324 (5923) ◽  
pp. 71-74 ◽  
Author(s):  
Michel Lefèvre ◽  
Eric Proietti ◽  
Frédéric Jaouen ◽  
Jean-Pol Dodelet
Keyword(s):  
Fuel Cells ◽  
Oxygen Reduction ◽  
Polymer Electrolyte ◽  
Polymer Electrolyte Fuel Cells ◽  
Reduction Activity ◽  
Iron Based ◽  
Iron Based Catalysts

Facile Metal Coordination of Active Site Imprinted Nitrogen Doped Carbons for the Conservative Preparation of Non-Noble Metal Oxygen Reduction Electrocatalysts

2017 ◽  
Vol 8 (9) ◽  
pp. 1701771 ◽  
Author(s):  
Asad Mehmood ◽  
Jonas Pampel ◽  
Ghulam Ali ◽  
Heung Yong Ha ◽  
Francisco Ruiz-Zepeda ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Noble Metal ◽  
Active Site ◽  
Metal Coordination ◽  
Nitrogen Doped

scholarly journals Mechanochemical Synthesis as a Greener Way to Produce Iron‐based Oxygen Reduction Catalysts

2021 ◽  
Author(s):  
Marius Gernhard ◽  
Max Rautenberg ◽  
Gerald Hörner ◽  
Birgit Weber ◽  
Franziska Emmerling ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Mechanochemical Synthesis ◽  
Oxygen Reduction Catalysts ◽  
Iron Based ◽  
Reduction Catalysts

scholarly journals Synthesis and Characterization of Carbon/Nitrogen/Iron Based Nanoparticles by Laser Pyrolysis as Non-Noble Metal Electrocatalysts for Oxygen Reduction

2018 ◽  
Vol 4 (3) ◽  
pp. 43 ◽  
Author(s):  
Henri Perez ◽  
Virginie Jorda ◽  
Pierre Bonville ◽  
Jackie Vigneron ◽  
Mathieu Frégnaux ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Active Sites ◽  
Volume Fraction ◽  
Laser Energy ◽  
Acid Leaching ◽  
Nitride Phase ◽  
Iron Nitride ◽  
Liquid Precursor ◽  
Laser Pyrolysis ◽  
Iron Based

This paper reports original results on the synthesis of Carbon/Nitrogen/Iron-based Oxygen Reduction Reaction (ORR) electrocatalysts by CO2 laser pyrolysis. Precursors consisted of two different liquid mixtures containing FeOOH nanoparticles or iron III acetylacetonate as iron precursors, being fed to the reactor as an aerosol of liquid droplets. Carbon and nitrogen were brought by pyridine or a mixture of pyridine and ethanol depending on the iron precursor involved. The use of ammonia as laser energy transfer agent also provided a potential nitrogen source. For each liquid precursor mixture, several syntheses were conducted through the step-by-step modification of NH3 flow volume fraction, so-called R parameter. We found that various feature such as the synthesis production yield or the nanomaterial iron and carbon content, showed identical trends as a function of R for each liquid precursor mixture. The obtained nanomaterials consisted in composite nanostructures in which iron based nanoparticles are, to varying degrees, encapsulated by a presumably nitrogen doped carbon shell. Combining X-ray diffraction and Mossbauer spectroscopy with acid leaching treatment and extensive XPS surface analysis allowed the difficult question of the nature of the formed iron phases to be addressed. Besides metal and carbide iron phases, data suggest the formation of iron nitride phase at high R values. Interestingly, electrochemical measurements reveal that the higher R the higher the onset potential for the ORR, what suggests the need of iron-nitride phase existence for the formation of active sites towards the ORR.

Encapsulated iron-based oxygen reduction electrocatalysts by high pressure pyrolysis

2017 ◽  
Vol 42 (36) ◽  
pp. 22887-22896 ◽  
Author(s):  
Lijie Zhong ◽  
Yang Hu ◽  
Lars Nilausen Cleemann ◽  
Chao Pan ◽  
Jakob Sværke ◽  
...  
Keyword(s):  
High Pressure ◽  
Oxygen Reduction ◽  
Iron Based
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