The Role of Superadsorbent Polymers on Covalent Organic Frameworks‐Based Solid Electrolytes: Investigation of the Ionic Conductivity and Relaxation

The scarcity of fossil fuels calls for immediate action toward the development clean and renewable energy resources. In this context, proton exchange membrane fuel cells (PEMFCs) are gaining ever-increasing attention as technology. Although covalent organic frameworks (COFs) do not usually exhibit high intrinsic conductivity (σ), they have been recently proposed solid polymer electrolytes in PEMFCs, thanks to their crystallinity stability acids bases. Here, a simple strategy is presented improve performance poor COF-based conductors through addition sodium polyacrylate (PANa) superadsorbent polymer. Electrochemical impedance spectroscopy investigations after activation at temperature relative humidity (RH) provide insights into role PANa, whose presence key preserve σ low RH. humidity-dependent X-ray diffraction study reveals strengthening stacking interaction along COF (100) plane direction with increasing humidity, formation H-bonding, thus promoting hopping. dielectric properties function PANa content enables determine Debye relaxation regime COF/PANa blend maximum frequency 1513 6606 Hz pristine blend, respectively, operating temperatures.