Role of Crystalline Defects in Electrocatalysis:  Mechanism and Kinetics of CO Adlayer Oxidation on Stepped Platinum Electrodes

2002 ◽  
Vol 106 (50) ◽  
pp. 12938-12947 ◽  
Author(s):  
N. P. Lebedeva ◽  
M. T. M. Koper ◽  
J. M. Feliu ◽  
R. A. van Santen
Keyword(s):  
Platinum Electrodes ◽  
Crystalline Defects ◽  
Mechanism And Kinetics ◽  
Kinetics Of

Electron Microscope Study of the Effect of Substrate Metal Dislocation Structure on the Structure of Electrodeposited Nickel

1975 ◽  
Vol 33 ◽  
pp. 94-95
Author(s):  
I. Gundiler ◽  
L.E. Murr
Keyword(s):  
Dislocation Structure ◽  
Growth Parameters ◽  
Growth Patterns ◽  
Dislocation Mechanism ◽  
Free Surfaces ◽  
Substrate Metal ◽  
Electrodeposited Nickel ◽  
Mechanism And Kinetics ◽  
Kinetics Of

The role of dislocations on crystal growth was first introduced by Frank and an extensive treatment of the theory was developed by Burton, et al. The growth parameters pertaining to electro-crystallization have been defined, and theories on the mechanism and kinetics of electrodeposition have been developed. The formation of spirals and pyramidal growth patterns are both explained by the screw-dislocation mechanism. Two dimensional nucleation on displacement-free surfaces and step-bunching mechanisms have also been suggested.Although a surface-diffusion-to-dislocation-steps mechanism for electrocrystallization is generally accepted, the effect of dislocation structure and density in the substrate on the microstructure of electrodeposited metals has not been systematically studied.

Surface oxidation and reduction of platinum electrodes: Coverage, kinetic and hysteresis studies

1968 ◽  
Vol 46 (6) ◽  
pp. 875-890 ◽  
Author(s):  
D. Gilroy ◽  
B. E. Conway
Keyword(s):  
Anodic Polarization ◽  
Reduction Process ◽  
Surface Oxidation ◽  
Surface Oxide ◽  
Platinum Black ◽  
Platinum Electrodes ◽  
Potential Sweep ◽  
Polarization Effects ◽  
Kinetics Of

Studies on the electrochemical formation and reduction of surface oxide at platinum electrodes have been carried out with particular reference to polarization and hysteresis effects in these processes. Comparisons between the results of galvanostatic and potential sweep techniques have been made for three types of surfaces of platinum electrodes prepared by: (a) heating in hydrogen; (b) heating in a flame; and (c) electrolytically forming platinum black surfaces. The dependence of the quantity of reducible oxide formed under prior steady-state potentiostatic conditions has been related to potential and time of anodic polarization. Polarization effects in the reduction of the surface oxide have been evaluated in terms of the potential dependence of the pseudocapacitance maximum for the oxide reduction process, and a mechanism for the reduction is suggested. The relative slowness of the reduction process is important in regard to the question of the role of oxide in the kinetics of electrocatalytic oxidations at platinum anodes. Hysteresis effects in anodic formation and cathodic reduction of the oxide are discussed in terms of a totally irreversible phase transition involving the ad-layer.

Activation of diatomic molecules at solid surfaces

2005 ◽  
Vol 363 (1829) ◽  
pp. 955-958 ◽  
Author(s):  
Gerhard Ertl
Keyword(s):  
Active Sites ◽  
Crystal Surface ◽  
Dissociative Adsorption ◽  
Solid Surfaces ◽  
Oxidation Of Co ◽  
Elementary Processes ◽  
Mechanism And Kinetics ◽  
Kinetics Of ◽  
Present Understanding

The interaction of a diatomic molecule with a well-defined single crystal surface represents the prototype of the elementary processes involved in heterogeneous catalysis, and it can be studied down to atomic length and extremely short (fs) time-scales. Our present understanding is illustrated by examples concerning the activation of hydrogen (including also the breakdown of thermal equilibrium during rapid laser-induced associative desorption), the role of steps as ‘active sites’ in the dissociative adsorption of NO or N 2 , and the mechanism and kinetics of the catalytic oxidation of CO.

Oil extraction from the sunflower seeds, mechanism and kinetics of the process

2020 ◽  
Vol 3 (1) ◽  
pp. 155-160
Author(s):  
Ye. M. Semenyshyn ◽  
◽  
V. M. Atamanyuk ◽  
O. Ya. Dobrovetska ◽  
T. I. Rymar ◽  
...  
Keyword(s):  
Oil Extraction ◽  
Sunflower Seeds ◽  
Mechanism And Kinetics ◽  
Kinetics Of
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