UV-crosslinkable anthracene-based ionomer derived gas “Expressway” for anion exchange membrane fuel cells

Abstract

The gas permeability of the catalyst layer was increased by 130% after crosslinking due to the high free volume.

Effects of hydrophobic side chains in poly(fluorenyl-co-aryl piperidinium) ionomers for durable anion exchange membrane fuel cells

“…The dimensional stability of an ionomer is critical for long-term operation of the fuel cell. 31,32 Ionomers with excessive SR will degrade the physical stability of catalyst layers, causing collapse and detachment. Additionally, excessively swollen ionomers will block the gas channel, resulting in high mass transfer resistance.…”

“…30 Moreover, the water adsorption and dehydration process of the ionomer will impair the stability of catalyst layers, causing exfoliation of catalyst layers and aggregation of catalyst particles. 31,32 On the cathode side, dehydration aggravates the nucleophilicity of OH − , which accelerates the degradation of ionomers. 33 Therefore, an ionomer with high chemical stability and a low swelling ratio is critical for achieving high-performance AEMFCs and long-term operation.…”

Challenges and Strategies of Anion Exchange Membranes in Hydrogen‐electricity Energy Conversion Devices

“…The highest peak power density of 493 mW cm À 2 was achieved because of sufficient oxygen penetrating through ionomer onto catalytic reaction interface. [195] The 3D-ordered membrane-catalyst layer interface in AEMWE is also an efficient strategy for pursuing high catalyst utilization. [196] Wan et al designed a novel membrane electrode assembly with unique vertical mass-transfer channels as shown in figure 12(c).…”

“…This strategy increased 130 % gas permeability in the catalyst layer, meanwhile, the ultraviolet light‐induced crosslinking structures prevent self‐aggregation of the Pt/C particles. The highest peak power density of 493 mW cm −2 was achieved because of sufficient oxygen penetrating through ionomer onto catalytic reaction interface [195] …”

Molecular-Level Control over Oxygen Transport and Catalyst–Ionomer Interaction by Designing Cis–Trans Isomeric Ionomers

“…Kim et al have pioneered a series of elaborately designed polyaromatic ionomers that avoid the adsorption of phenyl groups on the surface of the catalysts. − Xu et al and Yan et al. adopted the ionomer cross-linking strategy to alleviate the self-aggregation of catalyst particles, thus improving the durability of the CLs. − In addition, several efforts were devoted to enhancing the oxygen permeability of ionomer binders with some successes. Lee and co-workers, for example, demonstrated that higher flexibility of the poly­(phenylene oxide)-based ionomer was desired for the CL binder due to the improved gas permeability .…”