High stability polyaromatic quinuclidinium anion exchange membrane was published in Science China Materials, an excellent domestic journal

Anion exchange membrane electrolysis of water for hydrogen production without platinum group precious metal catalyst is expected to replace the high cost proton exchange membrane electrolysis technology. However, the dimensional stability of anion exchange membranes (AEM) and the low alkaline stability in high temperature and high concentration lye have hindered the development of anion exchange membranes for water electrolysis. Since the team of Professor Liming of Hubei University and Wuhan Limo Technology Co., LTD created poly (triphenyl-N-methyl quinuclidinium) AEM with excellent alkaline stability (Advanced Materials, 2023, 35, 51, 2306675), In order to further improve the mechanical strength and dimensional stability of the AEM, poly (triphenyl-trifluoroacetophenone-n-methyl quinuclidinium) AEM was prepared by adding a small amount of highly active hydrophobic monomer 2,2, 2-trifluoroacetophenone copolymer. This kind of copolymerized AEM has extremely high alkaline stability (no attenuation of OH− conductivity and mechanical strength occurs after soaking in 80 °C, 10 M NaOH solution for 1600 hours) and excellent dimensional stability (the swelling rate in pure water does not exceed 7% at 30-80 °C temperature; The swelling rate of 10 M NaOH solution does not exceed 2%), high hydroxide conductivity (up to 134.45 mS/cm at 80 °C) and high mechanical strength (tensile strength up to 43.2 MPa). This simple water electrolysis cell assembled with AEM and foam nickel alloy electrodes has a high current density of 1780 mA/cm2 at 80 °C, 2.0 V and 5 M KOH water electrolytes, and has high durability with foam nickel electrode assembled water electrolysis cell. It is believed that the results will help promote the development of carbon neutral technologies such as green hydrogen production, fuel cells, and flow batteries.

Poly(aryl N-methyl quinuclidinium) Anion Exchange Membrane with Both Ultra-high Alkaline Stability and Dimensional Stability

Ju Wen, Xianying He, Ganbing Zhang, Mengying Zeng, Yu Qian, Ming Li 

DOI:  10.1007/s40843-023-2761-9   Science China Materials. 2024.

Original link

https://www.sciengine.com/SCMs/doi/10.1007/s40843-023-2761-9