overpotential


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overpotential

[¦ō·vər·pə′ten·chəl]
(electricity)
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In the first step, applying a high overpotential results in the formation of structures with dense-branching morphology, which are loosely attached to the surface.
At low pH values, the deposit consists of a higher content of nickel and iron, and the deposition takes place with slightly lower nucleation overpotential than at higher pH values.
The utilization of a nanocomposite constituting multi-walled carbon nanotubes and an ionic liquid furnishes a desirable platform for immobilization of the NAD+ oxidation products and allows the realization of a highly sensitive electrocatalytic system with a considerably lowered overpotential of the NADH oxidation process.
It lowers the overpotential for CO2 reduction tremendously," said Kenis, who is also a professor of mechanical science and engineering and affiliated with the Beckman Institute for Advanced Science and Technology.
2] is catalytic anodic material, a strong oxidizing agent, like ozone and free hydroxyl radicals that could be formed electrochemically on Pb due to its high overpotential for oxygen generation.
It is represented by log current density axis on Evan's diagram and is majorly driven by the overpotential equation
However, in the case of an active metal such as Nb in an aqueous electrolyte, the overpotential for the dissolution reactions is so great that it is difficult to completely suppress cathodic reactions on the anodic sample.
In the presence of Fe, the nucleation/electro-crystallization overpotential (BC portion) increases, meaning that zinc deposition becomes more difficult in the presence of Fe.
The CNT mat is a sheet of multi-walled carbon nanotubes which is expected to be one of the ideal electrode materials for biochemical applications for its easy functionalization, electrical conductivity, large surface area, porosity, and ability to lower the overpotential in various bio-chemical species.
The increase cell performance with the increase in temperature is due to decrease activation overpotential and faster reaction kinetics.
Although having high faradaic conversion efficiency, metallic electrodes require large overpotential, leading to high electrical power losses.