The Role of Surface Defects in CO Oxidation, Methanol Oxidation, and Oxygen Reduction on Pt(111)

2007 ◽  
Vol 154 (12) ◽  
pp. F238 ◽  
Author(s):  
Jacob S. Spendelow ◽  
Qinqin Xu ◽  
Jason D. Goodpaster ◽  
Paul J. A. Kenis ◽  
Andrzej Wieckowski
Keyword(s):  
Co Oxidation ◽  
Oxygen Reduction ◽  
Methanol Oxidation ◽  
Surface Defects

Role of surface defects in catalytic properties of CeO 2 nanoparticles towards oxygen reduction reaction

2017 ◽  
Vol 200 ◽  
pp. 99-106 ◽  
Author(s):  
K. Sudarshan ◽  
S.K. Sharma ◽  
Ruma Gupta ◽  
Santosh K. Gupta ◽  
F.N. Sayed ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Surface Defects ◽  
Catalytic Properties ◽  
Reduction Reaction

Role of the carbon defects in the catalytic oxygen reduction by graphite nanoparticles: a spectromagnetic, electrochemical and computational integrated approach

2019 ◽  
Vol 21 (11) ◽  
pp. 6021-6032 ◽  
Author(s):  
Claudio Greco ◽  
Ugo Cosentino ◽  
Demetrio Pitea ◽  
Giorgio Moro ◽  
Saveria Santangelo ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Surface Defects ◽  
Integrated Approach ◽  
Reduction Reaction ◽  
Graphite Nanoparticles

The surface defects of graphite play a key role in its catalytic activity towards the oxygen reduction reaction.

scholarly journals Oxygen-Containing Nanoclusters on the Surface of Pt-Electrodes and Oxygen Reduction Reaction in Alkaline Medium

2018 ◽  
Vol 2018 ◽  
pp. 1-13
Author(s):  
Aleksey M. Trunov
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Surface Defects ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Heterogeneous Chemical Reaction ◽  
Stationary Potential ◽  
Pt Electrodes ◽  
Main Factor

Analysis of the role of oxygen-containing nanoclusters in oxygen reduction reaction (ORR) on Pt-electrodes in alkaline media is provided on the basis of the concept of electrochemical processes with slowed stage of consecutive heterogeneous chemical reaction (ConHCR). Under the ConHCR concept, the main factor determining the ORR characteristics is energetic inhomogeneity of electrode surface (EIES) according to Temkin. A new concept, according to which EIES is determined by the Gibbs energy of formation of oxygen-containing surface structures with inclusions of surface defects of the platinum crystal structure, Pts,d, is formulated. A correlation between the level of EIES of Pt-electrodes and packing density of Pts,d atoms on the surface of Pt(hkl) monocrystals is determined. The concept, according to which the stationary potential of ORR process is considered as a “mixed potential” of two reactions (electrochemical reduction of surface atom PtIIs,d and consecutive oxidation of PtIs,d by molecular oxygen), is substantiated. It is proposed that the formation of surface nanocluster transition state [⁎(OO)PtIIs,d(OH)] defines the rate of the entire ORR process on Pt-electrodes in alkaline media.

On the Role of Diffusion in the Oxidation of Fe, Ni, Co and the Fe-Sn Alloy by Calcium and Sodium Sulfates

2006 ◽  
Vol 258-260 ◽  
pp. 63-67
Author(s):  
V.M. Chumarev ◽  
V.P. Maryevich ◽  
V.A. Shashmurin
Keyword(s):  
Co Oxidation ◽  
Chemical Reaction ◽  
Diffusion Processes ◽  
Transport Processes ◽  
Diffusion Transport ◽  
Sodium Sulfates ◽  
Product Forms ◽  
Kinetics Of ◽  
Dominant Part

Diffusion processes play a dominant part in the macro kinetics of Fe, Ni and Co oxidation by calcium and sodium sulfates. Here, the reaction product forms a compact covering which spatially divides the reagents on the surface in the same way as in the oxidation and sulfidization of metals by oxygen and sulfur. Therefore, it is possible to assume in advance that interaction of metals with calcium and sodium sulfates will be determined not by the actual chemical reaction properly but by the diffusion transport processes.

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