Electrochemical Synthesis of Nanostructured Materials and Related Anodic Behaviors PDF Download

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Electrochemical Synthesis of Nanostructured Materials and Related Anodic Behaviors

Electrochemical Synthesis of Nanostructured Materials and Related Anodic Behaviors PDF Author: Mingliang Wang
Publisher:
ISBN:
Category : Nanotechnology
Languages : en
Pages : 143

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Book Description
[Truncated abstract] This work studies the formation mechanisms of anodized materials and their related electrochemical anodic behaviors. Electrochemical anodization is a versatile method to create various materials with intricate nanostructured morphologies. These materials have potentials for various functional applications in chemical and biomedical sensing, photocatalysis, energy conversion in batteries and supercapacitors. The study is focused on three main aspects: experimental synthesis of anodized materials, theoretical analysis of formation mechanisms of anodized materials and fabrication metallic nanowires using anodized porous alumina. The following summarizes the highlights of the study. Firstly, different anodized structures are synthesized experimentally, including nano-channeled anodized alumina, nanoporous anodized tin oxide and anodized SnC2O4 particles. The related electrochemical behaviors of the metals during anodization are quantified and explained. Anodization current oscillations: The phenomenon of spontaneous periodical current oscillation during electrochemical anodization of tin in alkaline electrolytes is observed. Such phenomenon has been reported in the literature. Attempts have been made to explain this phenomenon on the basis of oxide film lift-off and electrolyte diffusion. This study demonstrates that the current oscillation is caused by oxygen generation and release on the tin anode, causing periodic redistribution of ion concentration in the electrolyte. The analysis also enables determination of the contributions of the two anodic reactions of tin oxidation and oxygen generation to the total anodic current. Secondly, a unified theory for the formation of surface structures of metals induced by anodization is proposed. The theory is based on thermodynamic and electrochemical principles. It is able to explain the main experimental observations of all three types of anodic structures, including solid compact oxide films, porous oxides and porous metal surface layers...