How does a small structural change of anode ionomer make a big difference in alkaline membrane fuel cell performance?
| Autor: | Yu Seung Kim, Dongguo Li, Daniel P. Leonard, Eun Joo Park, Albert S. Lee, Sandip Maurya, Chulsung Bae, Jong Yeob Jeon |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Materials science Water transport Hydrogen Renewable Energy Sustainability and the Environment Membrane electrode assembly chemistry.chemical_element 02 engineering and technology General Chemistry Polymer 021001 nanoscience & nanotechnology Anode chemistry.chemical_compound Membrane chemistry Chemical engineering General Materials Science 0210 nano-technology Ionomer Alkyl |
| Zdroj: | Journal of Materials Chemistry A. 7:25040-25046 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/c9ta10157h |
| Popis: | 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. 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. |
| Databáze: | OpenAIRE |
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