| 项目编号: | 1652445
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| 项目名称: | CAREER: Mechanisms of Ion Transport in Ionomer-Free Electrodes |
| 作者: | Iryna Zenyuk
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| 承担单位: | Tufts University
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| 批准年: | 2017
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| 开始日期: | 2017-03-01
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| 结束日期: | 2022-02-28
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| 资助金额: | 500587
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Engineering - Chemical, Bioengineering, Environmental, and Transport Systems
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| 英文关键词: | ion transport
; mechanism
; ionomer-free
; ionomer-free electrodespolymer electrolyte fuel cell
; significant cost motivation
; thin-film ionomer
; proton conduction
; reaction kinetic pathway
; orr
; operational window
; fundamental mechanism
; thin-film
; stem career
; ionomer-free pefc electrode
; oxygen reduction reaction
; ion-conduction mechanism
; oxygen transport resistance
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| 英文摘要: | PI: Zenyuk, Iryna V.
Proposal Number: 1652445
Institution: Tufts University
Title: CAREER: Mechanisms of Ion Transport in Ionomer-Free Electrodes
Polymer electrolyte fuel cells (PEFCs) hold great promise as a sustainable energy technology, and there is significant cost motivation to develop new electrode designs with low platinum (Pt) loading. However, recent reports on conventional, carbon-supported, reduced Pt-loading PEFC electrodes have shown significant performance losses due to oxygen transport resistance through a thin-film ionomer at high current-densities. These findings have motivated a search for alternative electrode designs that do not rely on ionomers for proton conduction. Nano-structured thin-film electrodes and several other extended-surface area electrodes have demonstrated promising power densities and durability, however underlying ion transport mechanisms and associated reaction kinetic pathways are still ill understood. The proposed project aims to determine the specific factors which limit performance of PEFCs using thin-film electrodes and allow for work to progress on overcoming these hurdles. The PI plans to integrate research findings into teaching and develop a broad range of educational and outreach activities to a diverse range of K-12 students, including underrepresented minorities, to foster excitement about renewable-energy and STEM careers.
The proposed research has three main objectives: (1) Elucidate the fundamental mechanisms of ion transport in water-filled Pt and dispersed, carbon-supported Pt electrodes. (2) Establish the operational window (current, temperature and relative humidity) for ion-conduction mechanisms under oxygen reduction reaction (ORR) currents. (3) Determine the participating ions and mechanisms that occur in ORR in water-filled electrodes and create tailored electrode designs to enhance the rate of ORR. The separation of competing ion transport mechanisms will be accomplished through ex-situ four-point probe experiments combined with in-operando electrochemical techniques and modeling studies. The proposed work has the potential to advance the current understanding of the mechanisms of ion transport in ionomer-free PEFC electrodes. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/90453
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| Appears in Collections: | 全球变化的国际研究计划
科学计划与规划
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| Recommended Citation: | |
Iryna Zenyuk. CAREER: Mechanisms of Ion Transport in Ionomer-Free Electrodes. 2017-01-01.
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