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Effects of the Reaction Environment on the Performance of Electrocatalysts for Liquid Alkaline Water Electrolysis
Effects of the Reaction Environment on the Performance of Electrocatalysts for Liquid Alkaline Water Electrolysis
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260311091530.5
- ISBN
- 9798270231323
- DDC
- 541
- 서명/저자
- Effects of the Reaction Environment on the Performance of Electrocatalysts for Liquid Alkaline Water Electrolysis / Raul A Marquez Montes
- 발행사항
- [Sl] : The University of Texas at Austin, 2025
- 형태사항
- 1 electronic resource (720 pages)
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
- 주기사항
- Advisors: Mullins, Charles Buddie Committee members: Resasco, Joaquin; Ren, Hang; Rose, Michael J.; Sanchez, Victor H. Ramos.
- 학위논문주기
- - Ph.D. : The University of Texas at Austin, 2025.
- 초록/해제
- 요약Liquid alkaline water electrolysis (LAWE) is a well-established technology for producing hydrogen gas from water. However, this technology faces significant challenges dictated by the reaction environment-ranging from fundamental processes at the electrode-electrolyte interface to technical issues such as gas bubble removal. This thesis describes the influence of seven intrinsic and extrinsic aspects that govern LAWE performance: the reconstruction of oxygen evolution reaction (OER) electrocatalysts; the impact of trace metal impurities in alkaline electrolytes; the effects of these impurities on transition metal oxyhydroxides; the influence of electrode geometry on gas bubble detachment; the quantification of interfacial pH gradients; the use of flow electrolyzers to scale up OER electrocatalysts; and the impact of variable operation under industrially relevant conditions. Each chapter addresses one of these aspects, including detailed experimental methods, discussion of the results, and dedicated appendices with supplementary figures, tables, and notes. First, the effects of the reaction environment on intrinsic electrode properties are discussed. Doping OER electrocatalysts with sulfur and phosphorus induces in situ reconstruction into the catalytically active metal oxyhydroxide phase. Trace Fe and Co impurities, present in commercial alkaline electrolytes, readily incorporate into these oxyhydroxides and influence their structure, electronic properties, and catalytic activity. An optimized electrolyte purification protocol is provided. Next, two key extrinsic factors are examined. Electrode geometry influences gas bubble behavior; cone-shaped surface patterns promote the detachment of smaller bubbles at higher rates. Interfacial pH deviates from the bulk under high current density-continuous flow Raman spectroscopy is introduced as a platform to quantify such pH gradients. Finally, LAWE performance under more realistic conditions is explored. Lab-scale flow electrolyzers operating at mild current densities (50 - 500 mA·cm−2) are used to evaluate electrocatalyst activity and stability. Reverse currents triggered by electrolyzer shutdown degrade metal oxyhydroxides by intensifying corrosion and structural changes. These findings expand the current understanding of both fundamental and applied challenges in LAWE and highlight future strategies for advancing the field.
- 언어주기
- English
- 일반주제명
- Analytical chemistry
- 일반주제명
- Materials science
- 일반주제명
- Physical chemistry
- 기타저자
- The University of Texas at Austin Chemistry
- 기본자료저록
- Dissertations Abstracts International. 87-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260311s2025 us eng d■001000017361184
■00520260311091530.5
■006m o d
■007cr|nu||||||||
■020 ▼a9798270231323
■040 ▼aMiAaPQD▼beng▼cMiAaPQD▼erda
■082 ▼a541
■1001 ▼aMarquez Montes, Raul A.▼eauthor.
■24510▼aEffects of the Reaction Environment on the Performance of Electrocatalysts for Liquid Alkaline Water Electrolysis ▼cRaul A Marquez Montes
■260 ▼a[Sl]▼bThe University of Texas at Austin▼c2025
■264 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a1 electronic resource (720 pages)
■336 ▼atext▼btxt▼2rdacontent
■337 ▼acomputer▼bc▼2rdamedia
■338 ▼aonline resource▼bcr▼2rdacarrier
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-06, Section: B.
■500 ▼aAdvisors: Mullins, Charles Buddie Committee members: Resasco, Joaquin; Ren, Hang; Rose, Michael J.; Sanchez, Victor H. Ramos.
■5021 ▼bPh.D.▼cThe University of Texas at Austin▼d2025.
■520 ▼aLiquid alkaline water electrolysis (LAWE) is a well-established technology for producing hydrogen gas from water. However, this technology faces significant challenges dictated by the reaction environment-ranging from fundamental processes at the electrode-electrolyte interface to technical issues such as gas bubble removal. This thesis describes the influence of seven intrinsic and extrinsic aspects that govern LAWE performance: the reconstruction of oxygen evolution reaction (OER) electrocatalysts; the impact of trace metal impurities in alkaline electrolytes; the effects of these impurities on transition metal oxyhydroxides; the influence of electrode geometry on gas bubble detachment; the quantification of interfacial pH gradients; the use of flow electrolyzers to scale up OER electrocatalysts; and the impact of variable operation under industrially relevant conditions. Each chapter addresses one of these aspects, including detailed experimental methods, discussion of the results, and dedicated appendices with supplementary figures, tables, and notes. First, the effects of the reaction environment on intrinsic electrode properties are discussed. Doping OER electrocatalysts with sulfur and phosphorus induces in situ reconstruction into the catalytically active metal oxyhydroxide phase. Trace Fe and Co impurities, present in commercial alkaline electrolytes, readily incorporate into these oxyhydroxides and influence their structure, electronic properties, and catalytic activity. An optimized electrolyte purification protocol is provided. Next, two key extrinsic factors are examined. Electrode geometry influences gas bubble behavior; cone-shaped surface patterns promote the detachment of smaller bubbles at higher rates. Interfacial pH deviates from the bulk under high current density-continuous flow Raman spectroscopy is introduced as a platform to quantify such pH gradients. Finally, LAWE performance under more realistic conditions is explored. Lab-scale flow electrolyzers operating at mild current densities (50 - 500 mA·cm−2) are used to evaluate electrocatalyst activity and stability. Reverse currents triggered by electrolyzer shutdown degrade metal oxyhydroxides by intensifying corrosion and structural changes. These findings expand the current understanding of both fundamental and applied challenges in LAWE and highlight future strategies for advancing the field.
■546 ▼aEnglish
■590 ▼aSchool code: 0227
■650 4▼aAnalytical chemistry
■650 4▼aMaterials science
■650 4▼aPhysical chemistry
■653 ▼aLiquid alkaline water electrolysis
■653 ▼aOxygen evolution reaction
■653 ▼aElectrode geometry
■653 ▼aRaman spectroscopy
■653 ▼aCatalytic activity
■7102 ▼aThe University of Texas at Austin▼bChemistry.▼edegree granting institution.
■7201 ▼aMullins, Charles Buddie▼edegree supervisor.
■7730 ▼tDissertations Abstracts International▼g87-06B.
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17361184▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
