Electrolyte Transport in Porous Media
Electrolyte Transport in Porous Media
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152816
- ISBN
- 9798346877912
- DDC
- 541
- 서명/저자
- Electrolyte Transport in Porous Media
- 발행사항
- [Sl] : University of Colorado at Boulder, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 183 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-06, Section: B.
- 주기사항
- Advisor: Gupta, Ankur.
- 학위논문주기
- Thesis (Ph.D.)--University of Colorado at Boulder, 2024.
- 초록/해제
- 요약Ion transport in porous media is the main physical mechanism of high-power energy storage technologies such as supercapacitors, at the expense of a moderately low energy density. These devices are used for quick energy deployment to protect computer memory and batteries from voltage and current oscillations, stabilize power delivery in energy grids, and match intermittent energy supply and demand from renewable sources. Yet, due to the complexity of the physics of ion transport in confinement, the models typically used to approximate this phenomenon and gauge progress in desired properties such as capacitance and power density for broad operating conditions hinge on effective circuit representations, which are semi-empirical extensions of an oversimplified picture of the transport process focused on large disconnected pores permeated by electrolytes with ions with equal mobilities. In this thesis, we expand the fundamental de Levie circuit to the technologically relevant limit of networks of nanometric pores permeated by ionic species of dissimilar mobilities. We perform asymptotic reductions of the governing equations to develop first-principles equivalent circuit representations of the electrode/electrolyte interfacial charging process. We validate the model against direct numerical simulations of the full governing equations. We find that the equivalent circuit that describes narrow pores holds for electrochemical potentials, not electric potentials. We also learn that the unequal ion mobilities in confinement can be described by coupled circuits, representing the unequal rates of attraction of counterions and repulsion of co-ions. The impedance response of these coupled circuits can be understood as a combination of Warburg elements, suggesting their applicability to equivalent circuit representations of experiments. Finally, we show that an open pore with a varying cross-section under a sinusoidal gate potential can produce a frequency-controlled flow in either direction, relevant to biological nanochannels.
- 일반주제명
- Physical chemistry
- 일반주제명
- Applied mathematics
- 키워드
- Electrokinetics
- 키워드
- Porous media
- 기타저자
- University of Colorado at Boulder Chemical and Biological Engineering
- 기본자료저록
- Dissertations Abstracts International. 86-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798346877912
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■040 ▼aMiAaPQ▼cMiAaPQ
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■1001 ▼aH. de Sousa Evangelista, F.▼0(orcid)0000-0001-7818-9606
■24510▼aElectrolyte Transport in Porous Media
■260 ▼a[Sl]▼bUniversity of Colorado at Boulder▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a183 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-06, Section: B.
■500 ▼aAdvisor: Gupta, Ankur.
■5021 ▼aThesis (Ph.D.)--University of Colorado at Boulder, 2024.
■520 ▼aIon transport in porous media is the main physical mechanism of high-power energy storage technologies such as supercapacitors, at the expense of a moderately low energy density. These devices are used for quick energy deployment to protect computer memory and batteries from voltage and current oscillations, stabilize power delivery in energy grids, and match intermittent energy supply and demand from renewable sources. Yet, due to the complexity of the physics of ion transport in confinement, the models typically used to approximate this phenomenon and gauge progress in desired properties such as capacitance and power density for broad operating conditions hinge on effective circuit representations, which are semi-empirical extensions of an oversimplified picture of the transport process focused on large disconnected pores permeated by electrolytes with ions with equal mobilities. In this thesis, we expand the fundamental de Levie circuit to the technologically relevant limit of networks of nanometric pores permeated by ionic species of dissimilar mobilities. We perform asymptotic reductions of the governing equations to develop first-principles equivalent circuit representations of the electrode/electrolyte interfacial charging process. We validate the model against direct numerical simulations of the full governing equations. We find that the equivalent circuit that describes narrow pores holds for electrochemical potentials, not electric potentials. We also learn that the unequal ion mobilities in confinement can be described by coupled circuits, representing the unequal rates of attraction of counterions and repulsion of co-ions. The impedance response of these coupled circuits can be understood as a combination of Warburg elements, suggesting their applicability to equivalent circuit representations of experiments. Finally, we show that an open pore with a varying cross-section under a sinusoidal gate potential can produce a frequency-controlled flow in either direction, relevant to biological nanochannels.
■590 ▼aSchool code: 0051.
■650 4▼aPhysical chemistry
■650 4▼aApplied mathematics
■653 ▼aElectrokinetics
■653 ▼aPorous media
■653 ▼aTransport phenomena
■690 ▼a0494
■690 ▼a0364
■71020▼aUniversity of Colorado at Boulder▼bChemical and Biological Engineering.
■7730 ▼tDissertations Abstracts International▼g86-06B.
■790 ▼a0051
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163976▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
