Synthesis and electrocatalytic properties for oxygen reduction of Pd4Fe nanoflowers

2018 ◽  
Vol 54 (51) ◽  
pp. 7058-7061 ◽  
Author(s):  
Chao Lian ◽  
Yunlv Cheng ◽  
Lifang Chen ◽  
Xiao Han ◽  
Xiaojuan Lei ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Crystal Plane ◽  
The Novel ◽  
Electrocatalytic Properties ◽  
Palladium Acetylacetonate ◽  
Hierarchical Architectures

Hierarchical Pd4Fe alloy nanoflowers with nanosheet petals mainly exposed the (111) crystal plane were prepared by reducing palladium acetylacetonate with Fe(CO)5 and oleylamine. The novel nanomaterials may be emerging materials in electrochemical field by virtue of the advantage of hierarchical architectures and 2D alloy nanosheets.

scholarly journals Electrostatic self-assembled multilayers of tetrachromatedmetalloporphyrins/polyoxometalateand its electrocatalytic properties in oxygen reduction

2014 ◽  
Vol 146 ◽  
pp. 819-829 ◽  
Author(s):  
Camilo García ◽  
Carlos Díaz ◽  
Paulo Araya ◽  
Fabiola Isaacs ◽  
Guillermo Ferraudi ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Electrocatalytic Properties ◽  
Self Assembled

Titania nanotubes coated with graphene as a promising catalyst for the oxygen reduction reaction

2020 ◽  
Vol 44 (18) ◽  
pp. 7417-7423
Author(s):  
Jiannan Cai ◽  
Xiaofeng Zhang ◽  
Yi Zhang ◽  
Mingxing Yang ◽  
Baohua Huang ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Specific Surface ◽  
Oxygen Reduction ◽  
Surface Area ◽  
Specific Surface Area ◽  
Active Sites ◽  
Reduction Reaction ◽  
Titania Nanotubes ◽  
Electron Conductivity ◽  
Electrocatalytic Properties

The enhanced electrocatalytic properties of rGO/TiO2NTs for the ORR are a result of increased specific surface area, number of active sites and accelerated electron conductivity.

scholarly journals Carbon-Supported Mo2C for Oxygen Reduction Reaction Electrocatalysis

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1805
Author(s):  
Dušan Mladenović ◽  
Milica Vujković ◽  
Slavko Mentus ◽  
Diogo M. F. Santos ◽  
Raquel P. Rocha ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Double Layer ◽  
Molybdenum Carbide ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Carbon Xerogel ◽  
Electrocatalytic Properties ◽  
Molybdenum Carbides

Molybdenum carbide (Mo2C)-based electrocatalysts were prepared using two different carbon supports, commercial carbon nanotubes (CNTs) and synthesised carbon xerogel (CXG), to be studied from the point of view of both capacitive and electrocatalytic properties. Cation type (K+ or Na+) in the alkaline electrolyte solution did not affect the rate of formation of the electrical double layer at a low scan rate of 10 mV s−1. Conversely, the different mobility of these cations through the electrolyte was found to be crucial for the rate of double-layer formation at higher scan rates. Molybdenum carbide supported on carbon xerogel (Mo2C/CXG) showed ca. 3 times higher double-layer capacity amounting to 75 mF cm−2 compared to molybdenum carbide supported on carbon nanotubes (Mo2C/CNT) with a value of 23 mF cm−2 due to having more than double the surface area size. The electrocatalytic properties of carbon-supported molybdenum carbides for the oxygen reduction reaction in alkaline media were evaluated using linear scan voltammetry with a rotating disk electrode. The studied materials demonstrated good electrocatalytic performance with Mo2C/CXG delivering higher current densities at more positive onset and half-wave potential. The number of electrons exchanged during oxygen reduction reaction (ORR) was calculated to be 3, suggesting a combination of four- and two-electron mechanism.

Enhancing by nano-engineering: Hierarchical architectures as oxygen reduction/ evolution reactions for zinc-air batteries

2019 ◽  
Vol 438 ◽  
pp. 226919 ◽  
Author(s):  
Tayyaba Najam ◽  
Syed Shoaib Ahmad Shah ◽  
Wei Ding ◽  
Jianghai Deng ◽  
Zidong Wei
Keyword(s):  
Oxygen Reduction ◽  
Hierarchical Architectures ◽  
Zinc Air Batteries

Crystal-Plane-Dependent Activity of Spinel Co3 O4 Towards Water Splitting and the Oxygen Reduction Reaction

2018 ◽  
Vol 5 (7) ◽  
pp. 1080-1086 ◽  
Author(s):  
Qianfeng Liu ◽  
Zhiping Chen ◽  
Zhao Yan ◽  
Yao Wang ◽  
Erdong Wang ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Water Splitting ◽  
Reduction Reaction ◽  
Crystal Plane ◽  
Dependent Activity

Effect of Co substitution for Fe in Sr2FeMoO6 on electrocatalytic properties for oxygen reduction in alkaline medium

Ionics ◽  
2012 ◽  
Vol 19 (8) ◽  
pp. 1155-1162 ◽  
Author(s):  
Mabrouk Cheriti ◽  
Abdelkrim Kahoul ◽  
Amor Azizi ◽  
Nicolas Alonso-Vante
Keyword(s):  
Oxygen Reduction ◽  
Alkaline Medium ◽  
Electrocatalytic Properties ◽  
Co Substitution

Study of IrxMny(CO)n(DMF)z as Electrocatalyst for Oxygen Reduction and Hydrogen Oxidation in the Presence of Fuel Cell Contaminants

2016 ◽  
Vol 19 (4) ◽  
pp. 185-192 ◽  
Author(s):  
M.L. Barrios-Reyna ◽  
J. Uribe-Godínez ◽  
J.M. Olivares-Ramírez ◽  
O. Jiménez-Sandoval
Keyword(s):  
Oxygen Reduction ◽  
Hydrogen Oxidation ◽  
Rotating Disk ◽  
Pem Fuel Cells ◽  
Platinum Group Metals ◽  
The Novel ◽  
Hydrogen Oxidation Reaction ◽  
Acid Media ◽  
X Ray ◽  
Wide Range

The oxygen reduction reaction (ORR) and the hydrogen oxidation reaction (HOR) have been studied on a wide range of elec-trocatalysts, including bimetallic materials which are based solely on platinum group metals and their alloys. This work reports the synthe-sis and characterization of a novel bimetallic electrocatalyst, IrxMny(CO)n(DMF)z, for the ORR and HOR in acid media. The material was synthesized by reacting Ir4(CO)12 and MnCl2·4H2O in DMF. It was characterized structurally by FT-IR and micro-Raman spectroscopy, X-ray diffraction, SEM and energy-dispersive X-ray spectroscopy; the electrochemical characterization was made by the rotating disk elec-trode technique, at room temperature. The electrocatalytic activity of the new material for the ORR and HOR does not show appreciable variations due to the presence of methanol or carbon monoxide, respectively, even at high concentrations of these contaminants (2 mol L-1 methanol and 0.5% CO). This tolerance is a very important property with respect to platinum-based catalysts, which are poisoned by low concentrations of such contaminants. The kinetic parameters of the novel catalyst, such as Tafel slope (b), exchange current density (jo) and charge transfer coefficient (α), are reported as well. The results show that the novel electrocatalyst is attractive for evaluation as cath-ode/anode in PEM fuel cells.

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