scholarly journals Observing Host–Guest Interactions at Molecular Interfaces by Monitoring the Electrochemical Current

ACS Omega ◽  
2020 ◽  
Vol 5 (18) ◽  
pp. 10581-10585
Author(s):  
Qiushuang Ai ◽  
Lunqiang Jin ◽  
Zhengjie Gong ◽  
Feng Liang
Keyword(s):  
Electrochemical Current

Discrete Wavelet Analysis of Electrochemical Current Noise of a High-Alloy Cast Steel in Sulfuric Acid and Sodium Chloride Solution

2019 ◽  
Vol 22 ◽  
pp. 48-54
Author(s):  
Marcel Mandel ◽  
Volodymyr Kietov ◽  
Lutz Krüger
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Chloride Solution ◽  
Cast Steel ◽  
Noise Signal ◽  
Discrete Wavelet ◽  
High Alloy ◽  
Electrochemical Current ◽  
Alloy Cast

The electrochemical current noise signal of a high-alloy cast steel was investigated in a 0.1 M sulfuric acid solution and in a 5 wt.% sodium chloride solution. In the sulfuric acid solution, the current time signal reveals characteristic spikes of high amplitudes. In the chloride containing solution, spontaneous power drops with a subsequent recovery of comparatively low intensity characterize the noise signal. Both noise records were analyzed by the discrete wavelet transform. For the noise signal in the sulfuric acid solution, the received wavelet coefficients exhibit the highest values in the fine scale, which signal the dominance of short-time corrosion events that were attributed to the observed hydrogen bubble evolution. In the chloride containing medium, the signal decomposition by the wavelet analysis reveals the highest coefficients predominantly in the coarse scale, indicating a preferred initiation of corrosion processes of high duration. The subsequent observations by scanning electron microscopy, reveal an attack by micro pitting, which is associated with the noise events.

Electrochemical current rectification with cross reaction at a TEMPO/viologen-substituted polymer thin-layer heterojunction

RSC Advances ◽  
2016 ◽  
Vol 6 (101) ◽  
pp. 99195-99201 ◽  
Author(s):  
H. Tokue ◽  
K. Kakitani ◽  
H. Nishide ◽  
K. Oyaizu
Keyword(s):  
Thin Layer ◽  
Cross Reaction ◽  
Thin Layers ◽  
Bilayer System ◽  
Large Current ◽  
Electrochemical Current ◽  
Current Rectification

The electrochemical large current rectification was achieved in the bilayer system composed of the TEMPO- and viologen-containing polymer thin layers.

In Situ Synchrotron X-ray Absorption Experiments and Modelling of the Growth Rates of Electrochemically Deposited ZnO Nanostructures

2007 ◽  
Vol 1017 ◽  
Author(s):  
Bridget Ingham ◽  
Benoit N. Illy ◽  
Jade R. Mackay ◽  
Stephen P. White ◽  
Shaun C. Hendy ◽  
...  
Keyword(s):  
Growth Rates ◽  
High Resolution Electron Microscopy ◽  
Ex Situ ◽  
X Ray ◽  
Deposition Parameters ◽  
Wide Range ◽  
Electrochemically Deposited ◽  
Electrochemical Current ◽  
X Ray Absorption

AbstractZnO is known to produce a wide variety of nanostructures that have enormous scope for optoelectronic applications. Using an aqueous electrochemical deposition technique, we are able to tightly control a wide range of deposition parameters (Zn2+ concentration, temperature, potential, time) and hence the resulting deposit morphology. By simultaneously conducting synchrotron x-ray absorption spectroscopy (XAS) experiments during the deposition, we are able to directly monitor the growth rates of the nanostructures, as well as providing direct chemical speciation of the films. In situ experiments such as these are critical to understanding the nucleation and growth of such nanostructures.Recent results from in situ XAS synchrotron experiments demonstrate the growth rates as a function of potential and Zn2+ concentration. These are compared with the electrochemical current density recorded during the deposition, and the final morphology revealed through ex situ high resolution electron microscopy. The results are indicative of two distinct growth regimes, and simultaneous changes in the morphology are observed.These experiments are complemented by modelling the growth of the rods in the transport-limited case, using the Nernst-Planck equations in 2 dimensions, to yield the growth rate of the volume, length, and radius as a function of time.

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