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Fabrication of block copolymer templ...

Bhaway, Sarang M.

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Fabrication of block copolymer templated mesoporous metal oxide composites for energy storage applications.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Fabrication of block copolymer templated mesoporous metal oxide composites for energy storage applications./
作者:	Bhaway, Sarang M.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
面頁冊數:	232 p.
附註:	Source: Dissertation Abstracts International, Volume: 78-07(E), Section: A.
Contained By:	Dissertation Abstracts International78-07A(E).
標題:	Film studies. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10307154
ISBN:	9781369517361

Fabrication of block copolymer templated mesoporous metal oxide composites for energy storage applications.
Bhaway, Sarang M.

Fabrication of block copolymer templated mesoporous metal oxide composites for energy storage applications. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 232 p.

Source: Dissertation Abstracts International, Volume: 78-07(E), Section: A.

Thesis (Ph.D.)--The University of Akron, 2016.

Block copolymer templated mesoporous (2 nm-50 nm) metal oxides are considered promising electrode materials for energy storage devices such as electrochemical capacitors or lithium/sodium ion batteries. The mesoporous electrode morphology offers several advantages: (1) high surface area and porosity facilitate charge transfer across the electrolyte-electrode interface, (2) nanoscale-dimension of the oxide framework minimizes the solid state ion diffusion paths, and (3) interconnected porous morphology enables rapid electrolyte transport through the electrodes, leading to overall enhancement in charge storage capabilities. This research attempts to study the effect of mesoporosity and mesopore geometry on charge storage capabilities and cycling stability of ordered mesoporous metal oxide electrodes in energy storage devices.

ISBN: 9781369517361Subjects--Topical Terms:

2122736
Film studies.

Fabrication of block copolymer templated mesoporous metal oxide composites for energy storage applications.
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245 1 0 $a Fabrication of block copolymer templated mesoporous metal oxide composites for energy storage applications.
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300 $a 232 p.
500 $a Source: Dissertation Abstracts International, Volume: 78-07(E), Section: A.
500 $a Adviser: Bryan Vogt.
502 $a Thesis (Ph.D.)--The University of Akron, 2016.
520 $a Block copolymer templated mesoporous (2 nm-50 nm) metal oxides are considered promising electrode materials for energy storage devices such as electrochemical capacitors or lithium/sodium ion batteries. The mesoporous electrode morphology offers several advantages: (1) high surface area and porosity facilitate charge transfer across the electrolyte-electrode interface, (2) nanoscale-dimension of the oxide framework minimizes the solid state ion diffusion paths, and (3) interconnected porous morphology enables rapid electrolyte transport through the electrodes, leading to overall enhancement in charge storage capabilities. This research attempts to study the effect of mesoporosity and mesopore geometry on charge storage capabilities and cycling stability of ordered mesoporous metal oxide electrodes in energy storage devices.
520 $a The first part of this dissertation focuses on fabrication of ordered mesoporous metal oxide composites utilizing the Evaporation Induced Self-Assembly (EISA) and the Block Copolymer Micelle Templating (BCMT) strategy. Firstly, we demonstrate fabrication of ordered mesoporous carbon-vanadium oxide composites utilizing EISA of phenolic resin oligomer (resol), VOCl3 and an amphiphilic triblock. We illustrate that carbon yield from resol carbonization can prevent break-out crystallization of vanadia during calcination and help maintain an ordered mesostructure. The mesoporous carbon-vanadia mesostructured thin films exhibit specific capacitance 7 times higher than their non-porous analog at high scan rates when tested as electrode in aqueous supercapacitor.
520 $a The second part of this thesis focuses on BCMT technique to fabricate ordered mesoporous mixed-metal oxide electrodes for battery applications. Ordered mesoporous NixCo(3-x)O4 thin films with varying chemical composition are fabricated using a metal nitrate-citric acid complex and an amphiphilic PEGMA-b-PBA block copolymer template. This templating strategy is further extended to fabricate porous and hierarchically structured, Ni encapsulated NiO/MnOx/carbon nanofiber composites based on electrospinning metal nitrate salts, citric acid, resol and PEGMA-b-PBA copolymer. The mesoporous structure is demonstrated to significantly enhance the composite materials performance as electrodes in sodium as well as lithium ion batteries.
520 $a To gain insights into the underlying mechanisms that enhance the charge storage capabilities of ordered mesoporous metal oxide anodes, final part of the dissertation focuses on in-operando grazing incidence small angle x-ray scattering and x-ray diffraction (GISAXS/GIXD) technique to monitor the structural evolution of a mesoporous NiCo2O 4 anode during Li+ ion battery operation. We demonstrate mesopores smaller than &sim;10 nm collapse during the first 2 cycles of operation due to volume expansion/contraction that accompanies Li+ ion insertion/de-insertion. However, the mesopores in anodes with pore size > 15 nm are only partially lost during the first 2 cycles of operation. This limited structural change leads to efficient and reversible Li+ ion insertion/de-insertion, thereby improving the capacity retention and overall cycling stability of the anode. This in-operando study illustrates how changes at the atomic scale (lithium insertion) impact the mesostructure, and provides correlations between mesostructure and storage performance in ordered mesoporous metal oxide anodes.
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