Advances in Ion Conducting Membranes and Binders for High Temperature Polymer Electrolyte Membrane Fuel Cells

Polydiallylammonium interpenetrating cationic network ion-solvating membranes for anion exchange membrane water electrolyzers

“…Among various water electrolyzers, polymer membrane-based water electrolyzers have significant merits over conventional alkaline water electrolyzers, in that they have an improved response time to the power fluctuation characteristic of renewable energy due to zero-gap design. 1–6 Anion exchange membrane water electrolyzers (AEMWEs) operate in an alkaline environment, so their oxidation potential is relatively lower compared to an acidic environment, such as the case of proton exchange water electrolyzers (PEMWEs). This reduced electrochemical corrosivity has a high kinetic activity of the oxygen evolution reaction (OER), thus enabling the ability to use inexpensive non-platinum group metal (non-PGM) catalysts.…”

Mitigating phosphoric acid migration in high temperature polymer electrolyte membrane fuel cells with hydrophobic polysilsesquioxane-based binders

“…Due to this characteristic, HT-PEMFCs show advantageous properties including improved CO impurity tolerance and simplified water management, as well as being not limited by thermal cooling restraints. 3 However, there are still remaining challenges associated with HT-PEMFCs, such as low power density, high platinum group metal catalyst loading, low durability under high current conditions, and slow start-up time. Many recent state-of-the-art research efforts have been conducted to overcome and resolve these demerits, 4 including the development of temperature and humidity independent ion-pair membranes 5 and phosphonated ionomers 6 that seek to improve the power density performance and durability under various extreme conditions for heavy-duty mobility applications.…”

Polyoxometalate-Cross-Linked Proton Exchange Membranes with Post-Assembled Nanostructures for High-Temperature Proton Conduction

“…High-temperature polymer proton exchange membranes (HT-PEMs) play a core role in energy storage and conversion technologies capable of bearing high-temperature conditions, like high-temperature fuel cells and high-temperature supercapacitors. − Generally, HT-PEMs need high anhydrous proton conductivity, excellent mechanical strength, as well as chemical stability at high temperatures . When designing HT-PEMs, two important factors are highly required, which include high-temperature-tolerant polymer matrices and efficient anhydrous proton-conducting moieties .…”