Mechanically Reinforced Anion-Exchange Composite Membrane with Improved Interface Integrity for Water Electrolysis.

Area of Science:

• Electrochemistry
• Materials Science

Background:

• Anion exchange membrane water electrolysis (AEMWE) offers a pathway to low-cost hydrogen production.
• Polymer membrane instability, including weak mechanical strength, hinders AEMWE advancement.

Purpose of the Study:

• To develop a mechanically robust and structurally stable composite membrane for AEMWE.
• To improve the performance and durability of membranes used in AEMWE.

Main Methods:

• Fabrication of a composite membrane using a polyphenylene sulfide (PPS) mesh scaffold, poly(biphenyl piperidinium) (PBP) ion conductor, and poly(vinyl alcohol) (PVA) binder.
• Characterization of mechanical properties (tensile strength, puncture resistance), swelling, and interfacial integrity.
• Performance testing of the membrane in AEMWE under alkaline conditions at elevated temperature.

Main Results:

• The PPS-PBP/PVA composite membrane exhibited significantly enhanced tensile strength and puncture resistance.
• Reduced swelling and improved interfacial integrity were observed in the composite membrane.
• The optimized membrane achieved a current density of 6 A cm⁻² at 2.16 V and demonstrated stable operation for 500 hours at 1 A cm⁻².

Conclusions:

• Reinforcement via a mechanical scaffold and interface regulation effectively creates robust composite membranes.
• The developed composite membrane shows great promise for durable and efficient anion exchange membrane water electrolysis.
• This approach addresses key limitations in polymer membranes for AEMWE applications.