Dipole Moment Induced Micro‐Nanopore Modulation Enables Dual‐Functional Conductive Anion Exchange Composite Membranes

ABSTRACT The design of the pores in alkaline porous diaphragms is crucial to the high efficiency, stability, and safety of alkaline water electrolysis systems. In this work, we successfully constructed a series of novel porous anion‐exchange composite membranes (PAECM) with surface micro‐nanopores by employing dual porogens (polyvinylpyrrolidone/polyethylene glycol) to induce dipole moment synergy and component modulation, meanwhile complemented by cationic sites (guar hydroxypropyltrimonium chloride) to achieve dual‐function transfer through channel transferring and site hopping. In particular, the moderate LUMO and low HOMO energy levels of partially quaternized GC reduce the migration energy barrier for OH − while ensuring high structural stability. The zirconium‐based PAECM‐ZPG G 1 (∼350 µm) exhibited a high bubble point pressure (∼3.9 bar) and low area resistance (∼0.14 Ω cm −2 ). Under conditions of 80°C and 30 wt.% KOH, the ZPG G 1 achieved a high current density of 1.89 A cm −2 at 2 V using a commercial nickel‐aluminum catalytic electrode. This ZPG G 1 composite membrane retained highly stable structural and electrochemical properties, and can withstand up to 480 h of operation under 1 A cm −2 . This method of pore‐structure modulation and ion‐transfer site anchoring provides prospective insights for the simultaneous optimization of gas barrier properties and high ion‐transfer capability in porous composite membranes.