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Ceramic Nanotubes for Applications i...

Saleh, Ibrahim.

Ceramic Nanotubes for Applications in Solar to Fuel Conversion, Batteries, and Chemical Gas Sensing.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Ceramic Nanotubes for Applications in Solar to Fuel Conversion, Batteries, and Chemical Gas Sensing.
作者:	Saleh, Ibrahim.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, 2019
面頁冊數:	148 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-05, Section: B.
附註:	Advisor: Nagpal, Prashant.
Contained By:	Dissertations Abstracts International81-05B.
標題:	Chemical engineering.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=22589575
ISBN:	9781088373026

Ceramic Nanotubes for Applications in Solar to Fuel Conversion, Batteries, and Chemical Gas Sensing.
Saleh, Ibrahim.

Ceramic Nanotubes for Applications in Solar to Fuel Conversion, Batteries, and Chemical Gas Sensing. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 148 p.

Source: Dissertations Abstracts International, Volume: 81-05, Section: B.

Thesis (Ph.D.)--University of Colorado at Boulder, 2019.

This item must not be sold to any third party vendors.

The design and development of a new class of material is urgently needed today to meet the current challenge of finding safe, reliable, renewable and environment-friendly energy sources. Also, developing new, safe and reliable energy storage system is needed to store the excess and unused energy produced by a renewable energy source such as solar or wind source. In addition, fabricating sensitive, portable and low-temperature gas sensor material is currently required to reduce the sensor’ energy consumption, detect toxic and combustible gases and analyze human exhaled breath for medical diagnosis. Fortunately, recent breakthroughs in the fabrication of quasi one-dimensioned metal oxide and ceramic-fiber composites have opened the door to investigate new materials as a potential candidate for the applications of energy and gas sensors.In this thesis we aim to: i) develop new, simple and cost-effective technique to synthesize doped and undoped inorganic metal oxide nanotube architecture for application in solar to fuel conversion, energy storage batteries, and chemical gas sensing, ii) synthesize and characterize a composite material made from Polymer Derived Ceramics (PDCs) and graphite fiber as high capacity, reliable and cost-effective lithium-ion battery negative electrode.In the first part of the current work, we explain in detail a new technique of synthesis and doping transition metal oxide, TiO2, nanotube via electrochemical anodization of titanium metal sheet in organic electrolytes containing a small amount of fluoride ion. We were able to simultaneously incorporate several anions and cation elements into the TiO2 nanotube crystal lattice by modifying the electrolyte composition in the anodization electrochemical cell.Several analytical techniques such as X-Ray diffraction, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were employed to study the structure, morphology and the elemental composition of the fabricated nanotube. The undoped, N-doped, Fe-doped, N-Fe co-doped and N-C co-doped TiO2 nanotubes were investigated as possible photoanodes candidate for photocatalytic water splitting application. The obtained results showed an improvement in; i) the nanotubes light absorption, especially the N and N-C doped samples, ii) the nanotubes charge transfer efficiency with N and N-Fe doped nanotubes as the most efficient samples, iii) the charge transport efficiency of the doped samples.In the second part, we investigated N-doped and undoped TiO2 nanotubes as possible reliable, safe and durable lithium-ion battery anode material. The results showed high and save lithium intercalation/deintercalation potential profile and relatively good cycling stability of both samples besides about a 25% increase in the specific capacity of N-doped nanotube. Also, we fabricate and study the electrochemical behavior of composite material made from polymer‐derived ceramics and graphite fiber as possible high capacity lithium-ion battery anode material. The anode electrochemical behavior was evaluated based on the thickness of the SiCO films. Thick films exhibited the typical behavior of bulk SiCO with high first cycle loss. However, thin films, 100 nm thick, show low first cycle as well as high capacity.In the last part, an effort has been to improve the performance of TiO2 nanotube as a room temperature gas sensor by modifying its surface properties with anion and cation dopant materials. The investigated gases were; i) Volatile Organic Compounds (VOCs) such as acetone, methanol, ethanol, ii) water, iii) gases such as nitric oxide and carbon monoxide. The results of the study revealed that the sensitivity and selectivity of cation or/and anion doped TiO2 nanotubes have increased toward specific target gases such as acetone. It was also observed that undoped and Nb-doped TiO2 nanotubes detected NO and CO at room temperature.

ISBN: 9781088373026Subjects--Topical Terms:

206267
Chemical engineering.

Ceramic Nanotubes for Applications in Solar to Fuel Conversion, Batteries, and Chemical Gas Sensing.
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300 $a 148 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-05, Section: B.
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502 $a Thesis (Ph.D.)--University of Colorado at Boulder, 2019.
506 $a This item must not be sold to any third party vendors.
520 $a The design and development of a new class of material is urgently needed today to meet the current challenge of finding safe, reliable, renewable and environment-friendly energy sources. Also, developing new, safe and reliable energy storage system is needed to store the excess and unused energy produced by a renewable energy source such as solar or wind source. In addition, fabricating sensitive, portable and low-temperature gas sensor material is currently required to reduce the sensor’ energy consumption, detect toxic and combustible gases and analyze human exhaled breath for medical diagnosis. Fortunately, recent breakthroughs in the fabrication of quasi one-dimensioned metal oxide and ceramic-fiber composites have opened the door to investigate new materials as a potential candidate for the applications of energy and gas sensors.In this thesis we aim to: i) develop new, simple and cost-effective technique to synthesize doped and undoped inorganic metal oxide nanotube architecture for application in solar to fuel conversion, energy storage batteries, and chemical gas sensing, ii) synthesize and characterize a composite material made from Polymer Derived Ceramics (PDCs) and graphite fiber as high capacity, reliable and cost-effective lithium-ion battery negative electrode.In the first part of the current work, we explain in detail a new technique of synthesis and doping transition metal oxide, TiO2, nanotube via electrochemical anodization of titanium metal sheet in organic electrolytes containing a small amount of fluoride ion. We were able to simultaneously incorporate several anions and cation elements into the TiO2 nanotube crystal lattice by modifying the electrolyte composition in the anodization electrochemical cell.Several analytical techniques such as X-Ray diffraction, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were employed to study the structure, morphology and the elemental composition of the fabricated nanotube. The undoped, N-doped, Fe-doped, N-Fe co-doped and N-C co-doped TiO2 nanotubes were investigated as possible photoanodes candidate for photocatalytic water splitting application. The obtained results showed an improvement in; i) the nanotubes light absorption, especially the N and N-C doped samples, ii) the nanotubes charge transfer efficiency with N and N-Fe doped nanotubes as the most efficient samples, iii) the charge transport efficiency of the doped samples.In the second part, we investigated N-doped and undoped TiO2 nanotubes as possible reliable, safe and durable lithium-ion battery anode material. The results showed high and save lithium intercalation/deintercalation potential profile and relatively good cycling stability of both samples besides about a 25% increase in the specific capacity of N-doped nanotube. Also, we fabricate and study the electrochemical behavior of composite material made from polymer‐derived ceramics and graphite fiber as possible high capacity lithium-ion battery anode material. The anode electrochemical behavior was evaluated based on the thickness of the SiCO films. Thick films exhibited the typical behavior of bulk SiCO with high first cycle loss. However, thin films, 100 nm thick, show low first cycle as well as high capacity.In the last part, an effort has been to improve the performance of TiO2 nanotube as a room temperature gas sensor by modifying its surface properties with anion and cation dopant materials. The investigated gases were; i) Volatile Organic Compounds (VOCs) such as acetone, methanol, ethanol, ii) water, iii) gases such as nitric oxide and carbon monoxide. The results of the study revealed that the sensitivity and selectivity of cation or/and anion doped TiO2 nanotubes have increased toward specific target gases such as acetone. It was also observed that undoped and Nb-doped TiO2 nanotubes detected NO and CO at room temperature.
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