Electrochemical Fabrication of Nickel-Based Nanostructured Materials and Their Applications

電化學制備鎳納米材料及其應用

Student thesis: Doctoral Thesis

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Award date8 Mar 2018

Abstract

Transition metal elements arouse extensive interests for synthesizing promising structural and functional nanostructured materials in the past decades. Various porous Ni and Ni compound materials have been reported, exhibiting great application potentialities in such as catalysis, electronics, magnetics, optics, mechanics, energy and biomedicines with advantages of controllable morphologies and composition, high surface area, high chemical reactivity, earth abundance, etc. This thesis reports the fabrication and study of Ni nanotube array and nanoporous Ni thin film with a facile electrochemical method, with their formation mechanism unveiled.

The first chapter gives an introduction to the research background of synthesis methodology and electrochemical applications of Ni-based nanoporous metals. The second chapter reports the template-free fabrication of Ni nanotube array via electroplating and electrochemical dealloying. The Ni nanotube array obtained possesses attractive properties for multipurpose uses such as anti-reflection, superhydrophobicity and anisotropic magnetism. The third chapter reports the hydrogen evolution assisted fabrication of nanoporous Ni thin film also via electroplating and electrochemical dealloying. The nanoporous Ni thin film is oxidized at the surface to form NiO and Ni(OH)2, and can be directly applied as high-performance supercapacitor electrodes. The fourth chapter reports the experiment and stimulation study of a layered Ni/NiOx supercapacitor electrode during charge-discharge cycles, with its structural evolution and composition changes revealed through polarized neutron and X-ray reflectometry analyses. The fifth chapter summarizes this thesis and indicates the orientations and challenges of future research.