How does a small structural change of anode ionomer make a big difference in alkaline membrane fuel cell performance?
Abstract
Anode ionomers of alkaline membrane fuel cells (AMFCs) play a critical role in hydrogen and water transport thus affecting cell performance and durability. Here, we modified a quaternized poly(biphenyl alkylene) ionomer with two chemical structural variations to increase hydrogen access to the AMFC anode: first, we introduced the symmetric dimethyl groups in the polymer backbone to increase polymer fractional free volume. Second, we replaced hydroxide-conducting alkyl trimethylammonium with alkyl triethylammonium to reduce cation–hydroxide–water co-adsorption on the hydrogen oxidation catalyst to increase hydrogen access to the co-adsorbed layer. Furthermore, we compared the performance benefits of the two structural variations through operating AMFCs under H2/O2 conditions. The membrane electrode assembly employing the modified poly(biphenyl alkylene) ionomer at the anode exhibited >1500 mW cm-2 peak power density at 80 °C with stable short-term durability (>100 h) under a constant current density of 0.6 A cm-2. This study provides an essential insight into designing anode ionomer of highly performing AMFCs.
- Authors:
-
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Rensselaer Polytechnic Inst., Troy, NY (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE). Fuel Cell Technologies Program; USDOE
- OSTI Identifier:
- 1764206
- Alternate Identifier(s):
- OSTI ID: 1571303
- Report Number(s):
- LA-UR-20-21325
Journal ID: ISSN 2050-7488
- Grant/Contract Number:
- 89233218CNA000001
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Materials Chemistry. A
- Additional Journal Information:
- Journal Volume: 7; Journal Issue: 43; Journal ID: ISSN 2050-7488
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE; Energy Sciences
Citation Formats
Park, Eun Joo, Lee, Albert Sung Soo, Leonard, Daniel Philip, Li, Dongguo, Jeon, Jong Yeob, Bae, Chul Sung, and Kim, Yu Seung. How does a small structural change of anode ionomer make a big difference in alkaline membrane fuel cell performance?. United States: N. p., 2019.
Web. doi:10.1039/c9ta10157h.
Park, Eun Joo, Lee, Albert Sung Soo, Leonard, Daniel Philip, Li, Dongguo, Jeon, Jong Yeob, Bae, Chul Sung, & Kim, Yu Seung. How does a small structural change of anode ionomer make a big difference in alkaline membrane fuel cell performance?. United States. https://doi.org/10.1039/c9ta10157h
Park, Eun Joo, Lee, Albert Sung Soo, Leonard, Daniel Philip, Li, Dongguo, Jeon, Jong Yeob, Bae, Chul Sung, and Kim, Yu Seung. Mon .
"How does a small structural change of anode ionomer make a big difference in alkaline membrane fuel cell performance?". United States. https://doi.org/10.1039/c9ta10157h. https://www.osti.gov/servlets/purl/1764206.
@article{osti_1764206,
title = {How does a small structural change of anode ionomer make a big difference in alkaline membrane fuel cell performance?},
author = {Park, Eun Joo and Lee, Albert Sung Soo and Leonard, Daniel Philip and Li, Dongguo and Jeon, Jong Yeob and Bae, Chul Sung and Kim, Yu Seung},
abstractNote = {Anode ionomers of alkaline membrane fuel cells (AMFCs) play a critical role in hydrogen and water transport thus affecting cell performance and durability. Here, we modified a quaternized poly(biphenyl alkylene) ionomer with two chemical structural variations to increase hydrogen access to the AMFC anode: first, we introduced the symmetric dimethyl groups in the polymer backbone to increase polymer fractional free volume. Second, we replaced hydroxide-conducting alkyl trimethylammonium with alkyl triethylammonium to reduce cation–hydroxide–water co-adsorption on the hydrogen oxidation catalyst to increase hydrogen access to the co-adsorbed layer. Furthermore, we compared the performance benefits of the two structural variations through operating AMFCs under H2/O2 conditions. The membrane electrode assembly employing the modified poly(biphenyl alkylene) ionomer at the anode exhibited >1500 mW cm-2 peak power density at 80 °C with stable short-term durability (>100 h) under a constant current density of 0.6 A cm-2. This study provides an essential insight into designing anode ionomer of highly performing AMFCs.},
doi = {10.1039/c9ta10157h},
journal = {Journal of Materials Chemistry. A},
number = 43,
volume = 7,
place = {United States},
year = {Mon Oct 14 00:00:00 EDT 2019},
month = {Mon Oct 14 00:00:00 EDT 2019}
}
Web of Science
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