Journal
ACS APPLIED ENERGY MATERIALS
Volume 4, Issue 7, Pages 6957-6967Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c01037
Keywords
anion exchange membrane; Y-branching; free volume; microphase separation; fuel cell
Funding
- National Natural Science Foundation of China [21776042, 22075037, 22021005]
- Fundamental Research Fund for the Central Universities of China [DUT19ZD214, DUT19TD33]
- Science and Technology Innovation Fund of Dalian [2018J12GX052]
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The study reports the synthesis of ether-free polymers with different degrees of Y-shaped branching as AEM materials, which can increase the free volume of the AEM and thus help build ion channels with lower hydroxide ion transport resistance, improving the ionic conductivity.
Anion exchange membrane (AEM) is the heart of alkali electrolyte membrane fuel cells (AEMFCs). To achieve high performance of AEMFC, high conductivity and alkaline stability of AEMs are highly desired. In the present work, we report the synthesis of ether-free polymers with different degrees of Y-shaped branching as AEM materials. Our investigations reveal that incorporating bulky, rigid, and Y-branching units into the polymer backbone can increase the free volume of the AEM and thus help build ion channels with lower hydroxide ion transport resistance. The resultant AEM showed a markedly improved ionic conductivity (116.92 mS/cm at 80 degrees C), while the simple linear type of the AEM only showed an ion conductivity of 63.63 mS/cm at a similar ion exchange capacity. With such an AEM, the peak power density of the H-2/O-2 single cell at 60 degrees C reaches 275 mW/cm(2).
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