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Synthesis and Electrochemical Properties of Micro-/Nanostructures of Metal Oxides

Author: JiangLiDan
Tutor: WuZhengCui
School: Anhui Normal University
Course: Physical and chemical
Keywords: Metal Oxide micro-/nanostructure ElectrochemicalProperties
CLC: TB383
Type: Master's thesis
Year: 2012
Downloads: 35
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Abstract


The purpose of this dissertation is to explore the controllable synthesisof inorganic micro-/nanostructures in solution phase by applying a simplecoordination chemistry principle, developing the effective methodologyto control both the phase and morphology of the final products. Moreover,the corresponding properties of the as-obtained inorganic micro-/nanostructures on electrochemical sensors of heavy metal ion of Hg2+orlithium ion batteries were also investigated. The details are summarizedbriefly as follows:1. Folding flake-like CuO （FFL CuO） micro-/nanostructure wassuccessfully prepared on a large scale using a facile1,6-hexanediaminassisted low-temperature solution approach. The growth mechanism ofthe sample was discussed based on the time-resolved experiments. Theexperimental results demonstrated that the microstructures of CuOstrongly depended on the concentration of the1,6-hexanediamin. Theas-prepared CuO micro-/nanostructures were dispersed in Chitosan （CH）solution to fabricate composite film on glass carbon electrode （GCE）. Theelectrochemical study has shown that the FFL CuO sub-microstructureexhibits highest catalytic effect on Hg2+than other CuO micro-/nanostructures. The amperometric response exhibited that the FFL CuOmicro-/nanostructure modified glassy carbon electrode has a goodresponse for Hg2+with a linear range of1μM to200μM in pH6.0phosphate buffered solutions.2. NiO nanosheets with uniformly distributed mesoporosity weresuccessfully synthesized on a large scale by calcination-Ni（OH）2nanosheet precursor, which was simply prepared using1,6-hexanediaminassisted solution approach. The as-prepared mesoporous NiO nanosheetshave been introduced for the first time for the sensing of mercury ionsbased on the construction of the NiO-CH/GCE electrode, which wasfound to be useful for selective electrochemical detection of Hg2+with alinear range of0.8μM to500μM in pH6.0phosphate buffered solutions, providing us another opportunity for exploring new electrochemicalapplication of NiO nanomaterials.3. Two different phases of vanadium dioxide, tetragonal phase of VO2（A）and monoclinic phase of VO2（B） with one-dimensional （1D）nanostructures of nanosheets and nanorods were successfully synthesizedon a large scale by a simple hydrothermal growth route using the rawmaterial vanadyl acetylacetonate （VO（acac）2） and water. The possiblemechanisms of the formation of1D nanostructures were elucidated basedon the layered structure of vanadium dioxide and the hydrolysis andcondensation of the material of VO（acac）2. In addition, we haveinvestigated the electrochemical intercalation properties with Li+of thesynthesized two different phases of1D vanadium dioxide. It was foundthat the nanorod VO2（B） electrode possesses better electrochemicalperformance in lithium ion batteries compared with nanosheet VO2（A）electrode, which is consistent with the tunnel structure in theircrystallographic structure.

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