Poly(Dibenzothiophene‐Terphenyl Piperidinium) for High‐Performance Anion Exchange Membrane Water Electrolysis
Wentao Zheng, Lanlan He, Tang Tang, Rong Ren, Husileng Lee, Guoheng Ding, Linqin Wang, Licheng Sun
Abstract
Abstract The anion exchange membrane water electrolysis is widely regarded as the next‐generation technology for producing green hydrogen. The OH − conductivity of the anion exchange membrane plays a key role in the practical implementation of this device. Here, we present a series of Z−S‐x membranes with dibenzothiophene groups. These membranes contain sulfur‐enhanced hydrogen bond networks that link surrounding surface site hopping regions, forming continuous OH − conducting highways. Z−S‐20 has a high through‐plane OH − conductivity of 182±28 mS cm −1 and ultralong stability of 2650 h in KOH solution at 80 °C. Based on rational design, we achieved a high PGM‐free alkaline water electrolysis performance of 7.12 A cm −2 at 2.0 V in a flow cell and demonstrated durability of 650 h at 2 A cm −2 at 40 °C with a cell voltage increase of 0.65 mV/h.