Basically, the electrode was fabric

Basically, the electrode was fabricated by coating an ionomercontaining catalyst ink solution (so called catalyst slurry) onto AEMor a gas diffusion layer (GDL). The key point related to the construction of effective TPBs is that the catalyst slurry should have agood dispersion and fast solidification during coating. Hence, a solvent selected to dissolve ionomers should possess a high dielectricconstant and low boiling point at the same time [23]. Typically,isopropanol/deionized water (IPA/DI water) has been well documented to be a good solvent system for catalyst slurries. Generally, AEI requires good solubility in IPA/DI water, while BTMA-ETFEis a special case. BTMA-ETFE with poor solubility can be directlyused as AEI after grinding the polymer powder to a small size. Although this grinding method has not been widely applied in otherAEIs, this method provides a feasible way for those AEIs with poorsolubility.