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Uniform, Nitrogen-Doped Carbon Nanospheres and Their Use as Supports for Single-Atom Catalysts
Uniform, Nitrogen-Doped Carbon Nanospheres and Their Use as Supports for Single-Atom Catalysts
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105327
- ISBN
- 9798263325077
- DDC
- 621
- 저자명
- Jeskey, Jacob.
- 서명/저자
- Uniform, Nitrogen-Doped Carbon Nanospheres and Their Use as Supports for Single-Atom Catalysts
- 발행사항
- [Sl] : Georgia Institute of Technology, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 141 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
- 주기사항
- Advisor: Xia, Younan.
- 학위논문주기
- Thesis (Ph.D.)--Georgia Institute of Technology, 2024.
- 초록/해제
- 요약With the global environmental crisis and ever-increasing demands on energy, development of sustainable systems for energy conversion has become one of the most important challenges today. Currently, electrochemical energy conversion technologies, including fuel cells, water splitting, and metal-air batteries, are considered the most promising means to meet the increasing requirements on energy due to their high-energy densities, high efficiency, and environmental greenness. Unfortunately, their practical use is challenged by the high cost, sluggish kinetics, and long-term stability issues resulting from the use of noble-metal electrocatalysts. Recently, single-atom catalysts (SACs) anchored to carbon nanosphere supports have gained tremendous attention as possible alternatives for noble-metal nanoparticles. However, their preparation typically involves complicated multi-step processes that are not practical for industrial use. In this dissertation, I present a simple yet highly effective chemical-confinement strategy to produce SACs on uniform porous carbon nanospheres with high loadings. Starting from the ground up, the first project was focused on improving the morphology and nitrogen content of carbon nanospheres using an EDTA-assisted synthesis. Without compromising uniformity, the synthesis could be scaled up 10 times to produce colloidal crystals that displayed iridescence across the entire visible spectrum. The synthesis was then modified to produce first-row transition metal SACs on uniform N-doped carbon nanospheres. Utilizing a chemical confinement strategy, a wide range of first-row transition metal SACs with remarkable loadings up to 3.87 wt.% were possible. Finally, I systematically investigated how porosity within the carbon nanospheres affects the activity of Ir-SACs toward formic acid oxidation (FAO). Specifically, we utilized a kinetically-controlled growth strategy to produce Ir-SACs loaded in uniform carbon nanospheres featuring mesoporous, yolk-shell, and hollow structures. The feasible synthesis should be extendible to other metals across the periodic table for the preparation of highly exposed SACs for different catalytic reactions.
- 일반주제명
- Fuel cells
- 일반주제명
- Metals
- 일반주제명
- Adsorption
- 일반주제명
- Potassium
- 일반주제명
- Electrocatalysis
- 일반주제명
- Nitrogen
- 일반주제명
- Nanotubes
- 일반주제명
- Polymers
- 일반주제명
- Electrolytes
- 일반주제명
- Poisoning
- 일반주제명
- Energy conversion
- 일반주제명
- Emulsion polymerization
- 일반주제명
- Oxidation
- 일반주제명
- Fourier transforms
- 일반주제명
- Carbon
- 일반주제명
- Nanocrystals
- 일반주제명
- Catalysis
- 일반주제명
- Alternative energy
- 일반주제명
- Analytical chemistry
- 일반주제명
- Atomic physics
- 일반주제명
- Chemical engineering
- 일반주제명
- Mathematics
- 일반주제명
- Nanotechnology
- 일반주제명
- Polymer chemistry
- 기본자료저록
- Dissertations Abstracts International. 87-05B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105327
■006m o d
■007cr#unu||||||||
■020 ▼a9798263325077
■035 ▼a(MiAaPQ)AAI32307895
■035 ▼a(MiAaPQ)GeorgiaTech77663
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a621
■1001 ▼aJeskey, Jacob.
■24510▼aUniform, Nitrogen-Doped Carbon Nanospheres and Their Use as Supports for Single-Atom Catalysts
■260 ▼a[Sl]▼bGeorgia Institute of Technology▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a141 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-05, Section: B.
■500 ▼aAdvisor: Xia, Younan.
■5021 ▼aThesis (Ph.D.)--Georgia Institute of Technology, 2024.
■520 ▼aWith the global environmental crisis and ever-increasing demands on energy, development of sustainable systems for energy conversion has become one of the most important challenges today. Currently, electrochemical energy conversion technologies, including fuel cells, water splitting, and metal-air batteries, are considered the most promising means to meet the increasing requirements on energy due to their high-energy densities, high efficiency, and environmental greenness. Unfortunately, their practical use is challenged by the high cost, sluggish kinetics, and long-term stability issues resulting from the use of noble-metal electrocatalysts. Recently, single-atom catalysts (SACs) anchored to carbon nanosphere supports have gained tremendous attention as possible alternatives for noble-metal nanoparticles. However, their preparation typically involves complicated multi-step processes that are not practical for industrial use. In this dissertation, I present a simple yet highly effective chemical-confinement strategy to produce SACs on uniform porous carbon nanospheres with high loadings. Starting from the ground up, the first project was focused on improving the morphology and nitrogen content of carbon nanospheres using an EDTA-assisted synthesis. Without compromising uniformity, the synthesis could be scaled up 10 times to produce colloidal crystals that displayed iridescence across the entire visible spectrum. The synthesis was then modified to produce first-row transition metal SACs on uniform N-doped carbon nanospheres. Utilizing a chemical confinement strategy, a wide range of first-row transition metal SACs with remarkable loadings up to 3.87 wt.% were possible. Finally, I systematically investigated how porosity within the carbon nanospheres affects the activity of Ir-SACs toward formic acid oxidation (FAO). Specifically, we utilized a kinetically-controlled growth strategy to produce Ir-SACs loaded in uniform carbon nanospheres featuring mesoporous, yolk-shell, and hollow structures. The feasible synthesis should be extendible to other metals across the periodic table for the preparation of highly exposed SACs for different catalytic reactions.
■590 ▼aSchool code: 0078.
■650 4▼aFuel cells
■650 4▼aMetals
■650 4▼aAdsorption
■650 4▼aPotassium
■650 4▼aElectrocatalysis
■650 4▼aScanning electron microscopy
■650 4▼aNitrogen
■650 4▼aNanotubes
■650 4▼aPolymers
■650 4▼aTransmission electron microscopy
■650 4▼aElectrolytes
■650 4▼aPoisoning
■650 4▼aEnergy conversion
■650 4▼aEmulsion polymerization
■650 4▼aOxidation
■650 4▼aFourier transforms
■650 4▼aCarbon
■650 4▼aNanocrystals
■650 4▼aCatalysis
■650 4▼aAtoms & subatomic particles
■650 4▼aAlternative energy
■650 4▼aAnalytical chemistry
■650 4▼aAtomic physics
■650 4▼aChemical engineering
■650 4▼aMathematics
■650 4▼aNanotechnology
■650 4▼aPolymer chemistry
■690 ▼a0363
■690 ▼a0486
■690 ▼a0748
■690 ▼a0542
■690 ▼a0405
■690 ▼a0652
■690 ▼a0495
■71020▼aGeorgia Institute of Technology.
■7730 ▼tDissertations Abstracts International▼g87-05B.
■790 ▼a0078
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360248▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


