A quantum dot intercalated robust covalent organic framework membrane for ultrafast proton conduction

Abstract

Proton exchange membranes (PEMs) integrating high proton conductivity and exceptional mechanical property are desirable for numerous energy-related fields. Here, zero-dimensional (0D) graphene quantum dot (GQD) functionalized with phosphoric acid groups...

Recent Progress of Crystalline Porous Frameworks for Intermediate-Temperature Proton Conduction

“…In the meantime, the frameworks can confine proton carriers inside the channels and prevent proton carriers leaking during operation, thus improving long-term stability. − (2) It is more feasible to study proton conduction mechanisms based on MOFs or COFs, due to the highly ordered crystalline structure. − However, MOFs and COFs generally lack intrinsic proton conductivity. Efforts have been made toward improving the proton conductivity of MOFs and COF by decorating functional groups onto the frameworks and loading guest components into cavities. − Progress has been achieved on MOF/COF proton conductors with water molecules as proton carriers under moderate temperatures (<80 °C) and high humidity. − However, when the operating temperature rises above 100 °C, the proton conductivity dramatically decreases due to the loss of water. − To achieve ideal proton conductivity, nonvolatile acids were applied as proton carriers to build a proton transport pathway through MOFs and COFs under intermediate-temperature and anhydrous conditions. − …”

Construction of dense H-bond acceptors in the channels of covalent organic frameworks for proton conduction

“…[1][2][3][4][5] As a signicant component for determining whether the fuel cell can operate efficiently, PEMs require excellent proton conductivity, outstanding thermal and chemistry stability. [6][7][8][9][10][11] However, the most advanced PEMs (e.g., Naon) experience a plunge in conductivity at high temperature due to the low relative humidity (RH). 12,13 The operation of PEMs under high temperature or anhydrous conditions is a signicant technology that can provide high electrode catalytic efficiency.…”

Pore Geometry and Surface Engineering of Covalent Organic Frameworks for Anhydrous Proton Conduction

“…These advantages render COFs potential materials for highly efficient proton conduction. In current, most of COFs are used for water‐mediated proton conduction because the hydrogen‐bonding network in water facilitates proton transport under mild conditions [27–34] . For anhydrous proton conduction, organic heterocyclic compounds or pure phosphoric acid replace water as proton carriers, [35–39] which enable high‐temperature proton transport but usually show worse performance due to the low structural stability or lack of anchoring sites.…”