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Research on the Morphology and Fractal Growth of Electrolytic Zinc for Zinc-Air Fuel Cells

Author: XiongJin
Tutor: XuXianZhi
School: University of Science and Technology of China
Course: Fluid Mechanics
Keywords: zinc energy storage electrolysis colloid substance transformation aggregation deposit fractal growth
CLC: TM911.41
Type: Master's thesis
Year: 2010
Downloads: 70
Quote: 0
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Abstract


As is discussed as an effective way of zinc energy storage through the carrier of zinc-air battery, zinc oxide which is the product of discharge of zinc-air battery is reduced to zinc by electrolysis from the source of solar energy, ensuring the cycle system of zinc-air batteries. Source of solar energy will meet the theme of environmental protection and development , and zinc energy storage will ensure the stability of energy storage as well as clean. Zinc electrolysis is the first step of the zinc-air battery cycle system and the key to zinc energy storage. Electrolytic zinc is got through KOH solution dissolves ZnO to form K2Zn（OH）4 in a situation of saturation and Zn（OH）42- gets e- on the cathode plate in a laboratory. The ability of KOH dissolving ZnO strengthens with the increasing of temperature and concentration of KOH in a general trend. K2Zn（OH）4, as a colloid, showing the characters of colloids, moves to the cathode plate under the force of electric power because of the adsorption of K+. KOH dissolves slowly, which can be changed by increaseing temperature and string thoroughly. H2O electrolysis will be inhibited if the concentration of KOH is high in the process of zinc electrolysis. Once the rate of ZnO dissolved to KOH solution matches that of electrolysis, the concentrations of substance in solution remain stable.External conditions such as voltage, concentration of KOH solution, temperature etc. are important factors which affect growth and the morphology of electrolytic deposits of zinc. It is due to the way of diffusion and aggregation of the "particles" which make up electrolytic zinc in the perspective of fractal growth. The 30% KOH solution, with saturated ZnO dissolved in a normal temperature, connected to 3.0V voltage, will cause electrolytic zinc to grow in a way similar to DLA diffusion-limited aggregation model, and it is the pattern of plane tangential center-type growth; if the temperature is increased to 35°C and some horizontal stirs are carried out, electrolytic zinc will grow in a way of normal direction vertical to a plate. Electrolytic zinc of the two growth modes above is furcate and somewhat dense, with statistical invariance on the different scales and self similarity. The 20% KOH solution, with saturated ZnO dissolved in a normal temperature, connected to 3.0V voltage, will generate self-similar dendritic structures with stable leading-edges. If the voltage is increased to 4.0V, with the 30% KOH solution, saturated ZnO dissolved in a normal temprature, electrolytic zinc will grow in a way similar to BA model with high density and maximal fractal dimension. If the concentration of KOH solution is reduced to 20%, the change of morphology does not occur until the concentration to 10%. And 10% KOH solution will bring electrolytic zinc to grow to regular dendritic structures.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell > Metal - air battery
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