Effects of Electrolyte Composition on the Supercapacitive Performance of Chemically Synthesized Bundles of Stacked Cu(OH)
            2
            Nanosheets

During the course of electron transmission investigations of the deformation structures associated with shock-loaded thin foil specimens of 70/30 brass, it was observed that in a number of instances preferential etching occurred along grain boundaries; and that the degree of etching appeared to depend upon the various experimental conditions prevailing during electropolishing. These included the electrolyte composition, the average current density, and the temperature in the vicinity of the specimen. In the specific case of 70/30 brass shock-loaded at pressures in the range 200-400 kilobars, the predominant mode of deformation was observed to be twin-type faults which in several cases exhibited preferential etching similar to that observed along grain boundaries. A novel feature of this particular phenomenon was that in certain cases, especially for twins located in the vicinity of the specimen edge, the etching or preferential electropolishing literally isolated these structures from the matrix.

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X-ray fluorescence determination of zinc sulfate in acidic zinc plating electrolyte

Industrial laboratory Diagnostics of materials ◽

10.26896/1028-6861-2020-86-10-18-22 ◽

2020 ◽

Vol 86 (10) ◽

pp. 18-22

Author(s):

K. N. Vdovin ◽

K. G. Pivovarova ◽

N. A. Feoktistov ◽

T. B. Ponamareva

Keyword(s):

Zinc Sulfate ◽

Zinc Coating ◽

Electrolyte Composition ◽

Complexometric Titration ◽

X Ray ◽

Fluorescence Determination ◽

Zinc Plating ◽

Zinc Determination

Zinc sulfate is the main component in the composition of the acidic zinc plating electrolyte. Deviation in the electrolyte composition from the optimum content leads to destabilization of the electrolysis process and deteriorate the quality of the resulting zinc coating. The proper quality of a zinc coating obtained by galvanic deposition can be ensured only with timely monitoring and adjustment of the electrolyte composition. A technique of X-ray fluorescence determination of zinc (in terms of zinc sulfate) in an acidic zinc plating electrolyte is proposed. The study was carried out using an ARL Quant’X energy dispersive spectrometer (Thermo Fisher Scientific, USA) with a semiconductor silicon-lithium detector. The features of the spectrometer design are presented. The optimal parameters of excitation and detection of zinc radiation were specified when the electrolyte sample was diluted 1:1000. The ZnKα1 line was used as an analytical line. The plotted calibration graph is linear, the correlation coefficient being 0.999234. The results of zinc determination according to the developed method were compared with the data of the reference method of complexometric titration to prove the reliability of the procedure. The results are characterized by good convergence and accuracy. The proposed method of X-ray fluorescence zinc determination in a zinc plating electrolyte equals complexometric titration in the limiting capabilities and even exceeds the latter in terms of the simplicity of sample preparation and rapidity. The developed method of X-ray fluorescence determination of zinc is implemented in analysis of the electrolyte used in the continuous galvanizing unit at «METSERVIS LLC».

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Preparation and Evaluation of the Supercapacitive Performance of MnO2/3D-reduced Graphene Oxide Aerogel Composite Electrode Through In Situ Electrochemical Deposition

Journal of Electronic Materials ◽

10.1007/s11664-021-08997-3 ◽

2021 ◽

Author(s):

Gu Liu ◽

Yukun Zhang ◽

Kejun Xu ◽

Liuying Wang ◽

Shanxin Xiong

Keyword(s):

Graphene Oxide ◽

Electrochemical Deposition ◽

Composite Electrode ◽

Supercapacitive Performance ◽

Reduced Graphene ◽

Aerogel Composite ◽

Reduced Graphene Oxide Aerogel ◽

Graphene Oxide Aerogel ◽

Preparation And Evaluation

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Metal-organic-framework derived hollow manganese nickel selenide spheres confined with nanosheets on nickel foam for hybrid supercapacitors

Dalton Transactions ◽

10.1039/d1dt01215k ◽

2021 ◽

Author(s):

Bahareh ameri ◽

Akbar Mohammadi Zardkhoshoui ◽

Saied Saeed Hosseiny Davarani

Keyword(s):

Active Sites ◽

Nickel Foam ◽

Metal Organic Framework ◽

High Surface ◽

Metal Organic Frameworks ◽

High Surface Area ◽

Supercapacitive Performance ◽

Hybrid Supercapacitors ◽

Porous Networks ◽

Metal Organic

Metal-organic frameworks (MOFs) derived nanoarchitectures have special features, such as high surface area (SA), abundant active sites, exclusive porous networks, and remarkable supercapacitive performance when compared to traditional nanoarchitectures. Herein,...

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Rb intercalation enhanced the supercapacitive performance of layer-structured MoS2 as a 2D model material

Materials Advances ◽

10.1039/d1ma00145k ◽

2021 ◽

Author(s):

Ahmed H Biby ◽

Basant A. Ali ◽

Nageh Allam

Keyword(s):

Energy Storage ◽

Alkali Metals ◽

2D Materials ◽

Model Material ◽

Supercapacitive Performance ◽

Storage Performance ◽

2D Model

Intercalation of alkali metals has proved to be an effective approach for the enhancement of the energy storage performance in layered-2D materials. However, the research so far has been limited...

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