A covalent organic framework membrane with enhanced directional ion nanochannels for efficient hydroxide conduction

Abstract

The design and preparation of novel hydroxide-conducting materials for anion exchange membrane are urgently demanded in alkaline anion exchange membrane fuel cells (AEMFCs). Herein, we demonstrate a significantly enhanced hydroxide...

Hydroxide ion-conducting viologen–bakelite organic frameworks for flexible solid-state zinc–air battery applications

“…51 Importantly, the observed and calculated diffusion coefficients for the hydroxide ions were comparable with those available from the recent computational works. [52][53][54][55] From the fits to the MSD plots, we estimated the activation energy for the diffusion of the hydroxide ions in the cationic polymer framework to be 0.22 eV (21 kJ mol À1 , Fig. S27, ESI †), which is comparable to the experimental activation energy (0.153 eV) (14.77 kJ mol À1 ) calculated using the Warburg Bode plot (Fig.…”

“…The calculated diffusion coefficients matched well with the theoretical values reported in the literature. 46,47 However, we could not find any experimentally calculated diffusion coefficients for hydroxide ions inside a porous material. However, for Cl − , the diffusion coefficient is on the order of 10 −8 cm 2 s −1 .…”

Poly(phenylene oxide)-Based Anion Exchange Membranes Having Linear Cross-Linkers or Star Cross-Linkers

“…Establishing a well-defined hydrophilic/hydrophobic microphase separation morphology is recognized as an effective method for AEMs to obtain enhanced ionic conductivity with moderate IECs. − To get rid of the above dilemma, cross-linked AEMs with hydrophilic/hydrophobic phase separation morphology are reported. − For example, Dekel and co-workers prepared a PEEK-based poly­(ethylene glycol) (PEG) cross-linked AEM that with high ionic conductivity and robust mechanical properties . In their work, the introduction of long hydrophilic cross-linkers promotes the formation of well-defined hydrophilic/hydrophobic phase separation, resulting in an improvement of ionic conductivity.…”

Synthesis of size-controlled boehmite sols: application in high-performance hydrogen-selective ceramic membranes

“…Besides hydrogen separation, porous membranes with precisely controlled nanostructure can be applied to other gas or solvent separation/capture processes. [53][54][55] In addition to membrane synthesis, boehmite nanoparticles can be used in other disciplines, 56 including chemistry, petroleum, medicine, energy, and the environment (Fig. S2 †).…”