Studies on the Development of Mossy Zinc Electrodeposits from Flowing Alkaline Electrolytes PDF Download
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Author: Laura Ann Mc Vay
Publisher:
ISBN:
Category :
Languages : en
Pages : 374
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Author: Laura Ann Mc Vay
Publisher:
ISBN:
Category :
Languages : en
Pages : 374
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 172
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The initiation and characteristics of mossy zinc electrodeposits have been investigated. Batteries with zinc electrodes are candidates for electric vehicle applications; however, this electrode is prone to form non-compact deposits that contribute to capacity loss and battery failure. Moss is deposited when the current density is far from the limiting current. This morphology first appears only after the bulk deposit is approximately 1 [mu]m thick. In this investigation, the effects of flow rate (Re=0--4000), current density (0--50 mA/cm2), concentration of the electroactive species (0.25 and 0.5 M), and the concentration of supporting electrolyte (3, 6, and 12 M) on the initiation of moss were examined. The rotating concentric cylinder electrode was employed for most of the experiments; and a flow channel was used to study the development of morphology. After the experiment, the deposit was characterized using microscopic, x-ray diffraction, and profilometric techniques. 94 refs., 72 figs.
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Category : Aeronautics
Languages : en
Pages : 292
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Author:
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Category : Power resources
Languages : en
Pages : 754
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Author: Laura Ann McVay
Publisher:
ISBN:
Category :
Languages : en
Pages : 276
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Category : Government publications
Languages : en
Pages : 1284
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Category : Electric automobiles
Languages : en
Pages : 76
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Author:
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Category :
Languages : en
Pages :
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Results of a study of the micromorphology and current efficiency of zinc electrodeposited from flowing, acidic chloride solutions are reported. The effects of six variables were examined: flow rate, current density, zinc and hydrogen ion concentration, concentrations of nickel, iron and cadmium impurity ions, and the nature of the substrate. The development of micromorphology was studied in-situ by means of videomicrography and ex-situ by means of scanning electron microscopy. This investigation focused on the formation of grooved deposits, which are found under a wide range of deposition conditions. The major conclusions of this study are: the most important variable determining whether grooved deposits form is the interfacial concentration; large protrusions orient themselves parallel to the flow direction with the orientation starting upstream and progressing downstream; large protrusions become ridges due to growth of the highest current density portions of the electrode under mass transport control. The current efficiency was measured using EDTA titration and weight measurements. The fraction of the current taken by zinc deposition increased with zinc concentration, ranging up to 100%, and decreased with pH. The efficiency of zinc deposition was affected by the flow rate and the substrate employed. Impurities lowered the current efficiency.
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Category : Dissertations, Academic
Languages : en
Pages : 796
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Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 1142
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