Tuning the ionomer distribution in fuel cell catalyst layer with scaling the ionomer aggregate size in dispersion = 이오노머 분산 크기에 따른 고분자 연료전지용 촉매층 내 이오노머 분포 및 물질 전달 제어

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With the demands for better performance of polymer electrolyte membrane fuel cells (PEMFCs), studies on controlling the distribution of ionomers have recently gained interest. Here, we present a tunable ionomer distribution in the catalyst layer (CL) with dipropylene glycol (DPG) and water mixtures as ionomer dispersion medium. Dynamic light scattering and molecular dynamics simulation demonstrate that, by increasing the DPG content in the dispersion, the size of the ionomer aggregates in the dispersion is exponentially reduced due to the higher affinity of DPG for Nafion ionomers. The ionomer distribution of the resulting CLs dictates the dimensional feature of the ionomer dispersion. Although the ionomer distribution becomes more uniform with increasing the DPG content, an optimal power performance is obtained at a DPG content of 50 wt% regardless of feed humidity due to balanced proton and mass transports. As a guide for tuning the ionomer distribution, we suggest that the ionomer aggregates in the dispersion with a size close to that of the Pt/C aggregates form a highly connected ionomer network and maintain a porosity in the catalyst/ionomer aggregate resulting in high power performance.
Advisors
Kim, Hee-Takresearcher김희탁researcher
Description
한국과학기술원 :생명화학공학과,
Publisher
한국과학기술원
Issue Date
2018
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2018.2,[iii, 36 p. :]

Keywords

Ionomer distribution▼acatalyst layer▼aionomer dispersion solvent▼aNafion ionomer▼apolymer electrolyte membrane fuel cell; 이오노머▼a이오노머 분산 용매▼a이오노머 분포▼a촉매층▼a고분자 전해질 연료전지

URI
http://hdl.handle.net/10203/266314
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=733880&flag=dissertation
Appears in Collection
CBE-Theses_Master(석사논문)
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