The influence of various LiF concentrations on the cathodic electrochemical behavior at the tungsten electrode in Na3AlF6–Al2O3 molten salt

RSC Advances ◽  
2015 ◽  
Vol 5 (30) ◽  
pp. 23915-23921
Author(s):  
Shaohu Tao ◽  
Yuezhong Di ◽  
Kejia Liu ◽  
Kun Zhao ◽  
Naixiang Feng ◽  
...  
Keyword(s):  
Molten Salt ◽  
Electrochemical Deposition ◽  
Electrochemical Behavior ◽  
Electrochemical Techniques ◽  
Deposition Process ◽  
Tungsten Electrode

The electrochemical deposition process of Al metal at the tungsten electrode in the melts of Na3AlF6–Al2O3 with various LiF concentrations was investigated at 1253 K by various electrochemical techniques.

NOVEL ROOM TEMPERATURE ELECTROCHEMICAL DEPOSITION OF HIGH TEMPERATURE SUPERCONDUCTING FILMS

2004 ◽  
Vol 18 (12n13) ◽  
pp. 505-549 ◽  
Author(s):  
S. H. PAWAR ◽  
P. M. SHIRAGE ◽  
D. D. SHIVAGAN ◽  
A. B. JADHAV
Keyword(s):  
Thin Films ◽  
Electrochemical Deposition ◽  
Room Temperature ◽  
Electrochemical Techniques ◽  
Deposition Process ◽  
Superconducting Films ◽  
Dimensional Structure ◽  
Hetero Structure ◽  
Review Reports ◽  
Low Dimensional

The present review reports the innovative attempts made in the synthesis of a variety of high T c superconductor families in the form of thin films by electrochemical techniques. Summarizing the brief background of electrochemical deposition process, the growth mechanism of high T c superconducting films has been explained. The successful stories of room temperature electrochemical deposition of RE - Ba 2 Cu 3 O 7-δ, Bi – Sr – Ca – CuO , Tl – Ba – Ca – CuO , Hg – Ba – Ca – CuO and MgB2 superconductors in the form of thin films on silver substrates have been summarized. The room temperature electrochemical synthesis technique has helped to form a low-dimensional structure at the interface of Al/Tl-2223 hetero structure, which leads to a pathway for high T c and J c . The photoinduced effects of a variety of heterostructures formed with HTSC systems and CdSe semiconductor are also described.

scholarly journals Electrochemical behavior of lanthanum and yttrium ions in two molten chlorides with different oxoacidic properties: The eutectic LiCl-KCl and the equimolar mixture CaCl2-NaCl

2003 ◽  
Vol 39 (1-2) ◽  
pp. 109-135 ◽  
Author(s):  
Y. Castrillejo ◽  
M.R. Bermejo ◽  
A.M. Martínez ◽  
Arocas Díaz
Keyword(s):  
Electrochemical Behavior ◽  
Electrochemical Techniques ◽  
Three Dimensional ◽  
Earth Metal ◽  
Active Species ◽  
Chloride Ions ◽  
Equimolar Mixture ◽  
Transport Parameters ◽  
Tungsten Electrode ◽  
Simple Diffusion

The electrochemical behavior of LaCl3 and YCl3 was studied in two molten chloride mixtures with different oxoacidic properties, the eutectic LiCl-KCl and the equimolar CaCl2-NaCl melt at different temperatures. The stable oxidation states of both elements have been found to be (III) and (0) in both melts, and it was found that both La(III) and Y(III) cations were less solvated by the chloride ions in the calcium-based melt, which was explained by the stability of CaCl4 2- ions in that melt. Transient electrochemical techniques, such as cyclic voltammetry, chronopotentiometry and chronoamperometry were used in order to study the reaction mechanism and the transport parameters of electro active species at a tungsten electrode. The results showed that in the eutectic LiCl-KCl, the electro crystallization of lanthanum and yttrium seems to be the controlling electrochemical step while in CaCl2-NaCl this phenomenon has not been observed. That was explained in terms of the differences in the physicochemical properties of the systems, especially interfacial tensions. In the eutectic LiCl-KCl chronoamperometric studies indicated instantaneous and three dimensional nucleation and crystal growth of lanthanum and yttrium whatever the applied over potential of the rare earth metal is, whereas in the equimolar mixture CaCl2-NaCl, the corresponding electrochemical exchanges were found to be quasi-reversible, and the values of the kinetic parameters, K0 and ?,were obtained for both reactions. Mass transport towards the electrode is a simple diffusion process, and the diffusion coefficients have been calculated. The validity of the Arrhenius law was also verified by plotting the variation of the logarithm of the diffusion coefficient versus 1/T.

Analysis of Electrochemical Deposition Process of Permalloy Films

2019 ◽  
Vol 24 (6) ◽  
pp. 547-556
Author(s):  
R.D. Tikhonov ◽  
◽  
S.A. Polomoshnov ◽  
V.V. Amelichev ◽  
D.V. Kostuk ◽  
...  
Keyword(s):  
Electrochemical Deposition ◽  
Deposition Process

Electrochemical and thermodynamic properties of U4+ and U3+ on Mo electrode in LiCl-KCl eutectic

2019 ◽  
Vol 107 (2) ◽  
pp. 95-104
Author(s):  
Ru-Shan Lin ◽  
You-Qun Wang ◽  
Zhao-Kai Meng ◽  
Hui Chen ◽  
Yan-Hong Jia ◽  
...  
Keyword(s):  
Free Energy ◽  
Thermodynamic Properties ◽  
Thermodynamic Functions ◽  
Electrochemical Behavior ◽  
Diffusion Coefficients ◽  
Electrochemical Techniques ◽  
Reduction Process ◽  
Standard Potential ◽  
Hcl Gas ◽  
Thermodynamic Functions Of Formation

Abstract In this study, UCl4 was prepared by the reaction of HCl gas with UO2 in the LiCl-KCl eutectic. Then, the electrochemical behavior of U4+ and U3+ on a Mo cathode was investigated by various electrochemical techniques. The reduction process of U4+ was regarded as two steps: U4++e=U3+; U3++3e=U. Diffusion coefficients of U4+ and U3+, the apparent standard potential of U4+/U3+, U3+/U as well as U4+/U in the LiCl-KCl molten salt on the Mo electrode was determined by numerous electrochemical methods. The thermodynamic functions of formation of Gibbs free energy of UCl4 and UCl3 are calculated as well.

Fabrication of an Apatite/Collagen Composite Coating on the NiTi Shape Memory Alloy through Electrochemical Deposition and Coating Characterisation

2009 ◽  
Vol 618-619 ◽  
pp. 319-323 ◽  
Author(s):  
Parama Chakraborty Banerjee ◽  
Tao Sun ◽  
Jonathan H.W. Wong ◽  
Min Wang
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Composite Coating ◽  
Electrochemical Deposition ◽  
Room Temperature ◽  
Composite Coatings ◽  
Deposition Process ◽  
Niti Shape Memory Alloy ◽  
X Ray ◽  
Niti Sma

To improve the biocompatibility and bioactivity of NiTi shape memory alloy (SMA), apatite/collagen composite coatings were fabricated on the surface of NiTi SMA at room temperature using the electrochemical deposition technique. Spherical apatite particles and fibrous collagen that formed the composite coating were visible under scanning electron microscope (SEM). The Ca/P ratio of the apatite component in the coating, as determined by energy dispersive X-ray spectroscopy (EDX), was about 1.38 which is slightly higher than that of octocalcium phosphate (OCP). X-ray diffraction result showed that the apatite was amorphous, which was due to the low temperature (i.e., room temperature) deposition process. The structure of the composite coatings was further characterized using Fourier transform infrared reflection spectroscopy (FTIR). It was also found that, compared to bare NiTi SMA samples, the wettability of as-deposited samples was increased because of the formation of the composite coating.

scholarly journals Электрохимическое осаждение контактных материалов в постростовой технологии фотоэлектрических преобразователей

2022 ◽  
Vol 56 (3) ◽  
pp. 376
Author(s):  
А.В. Малевская ◽  
Н.Д. Ильинская ◽  
Д.А. Малевский ◽  
П.В. Покровский
Keyword(s):  
Electrochemical Deposition ◽  
Ohmic Contacts ◽  
Deposition Process ◽  
Contact System ◽  
Horizontal Position ◽  
Deposition Uniformity ◽  
Galvanic Deposition

Investigations and modeling of ohmic contacts electrochemical deposition process in postgrowth technology of photovoltaic converters fabrication have been carried out. The technology of Ag/Au contact system galvanic deposition at vertical and horizontal position of heterostructure and anode in the electrolyte has been developed. The increase of contact system deposition uniformity up to ∼ 95% at the thickness of contact bus-bars ∼ 5 µm on the heterostructure area with 4 inch diameter has been archived.

scholarly journals Effect of pH on the Electrochemical Behavior of Hydrogen Peroxide in the Presence of Pseudomonas aeruginosa

2021 ◽  
Vol 9 ◽  
Author(s):  
Javier Espinoza-Vergara ◽  
Paulo Molina ◽  
Mariana Walter ◽  
Miguel Gulppi ◽  
Nelson Vejar ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Pseudomonas Aeruginosa ◽  
Enzymatic Activity ◽  
Electrochemical Behavior ◽  
Electrochemical Techniques ◽  
Stable State ◽  
Reduction Reaction ◽  
Maximum Activity ◽  
Open Circuit ◽  
Mueller Hinton

The influence of pH on the electrochemical behavior of hydrogen peroxide in the presence of Pseudomonas aeruginosa was investigated using electrochemical techniques. Cyclic and square wave voltammetry were used to monitor the enzymatic activity. A modified cobalt phthalocyanine (CoPc) carbon electrode (OPG), a known catalyst for reducing O2 to H2O2, was used to detect species resulting from the enzyme activity. The electrolyte was a sterilized aqueous medium containing Mueller-Hinton (MH) broth. The open-circuit potential (OCP) of the Pseudomonas aeruginosa culture in MH decreased rapidly with time, reaching a stable state after 4 h. Peculiarities in the E / I response were observed in voltammograms conducted in less than 4 h of exposure to the culture medium. Such particular E/I responses are due to the catalase’s enzymatic action related to the conversion of hydrogen peroxide to oxygen, confirming the authors’ previous findings related to the behavior of other catalase-positive microorganisms. The enzymatic activity exhibits maximum activity at pH 7.5, assessed by the potential at which oxygen is reduced to hydrogen peroxide. At higher or lower pHs, the oxygen reduction reaction (ORR) occurs at higher overpotentials, i.e., at more negative potentials. In addition, and to assess the influence of bacterial adhesion on the electrochemical behavior, measurements of the bacterial-substrate metal interaction were performed at different pH using atomic force microscopy.

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