(175a) A High Performing Long Life Anion Exchange Membrane Water Electrolyzer with Base Metal Catalysts
AIChE Spring Meeting and Global Congress on Process Safety
2020 Virtual Spring Meeting and 16th GCPS
Emerging Technologies in Clean Energy
Novel Hydrogen Generation Technologies
Tuesday, August 18, 2020 - 3:00pm to 3:20pm
Anion exchange membrane (AEM) electrolyzers are a relatively new technology for renewable hydrogen production. AEM electrolyzers have the key advantage that, they can start and stop quickly, and in principle, they do not require precious metal catalysts. Unfortunately, prior to our work, the lifetime of the electrolyzers has been limited unless preecious metals are used.
Here we report the performance of the first AEM electrolyzer to show industrially relevent lifetimes without using precious metals. The electrolyzer had a stainless-steel anode catalystï¼ a modified Raney nickel cathode catalystï¼ and a tetramethyl imidazole functionalized styrene membrane. The cell showed current densities at 60 Â°C of 1 A/cmÂ² at 1.82 V and 3 A/cmÂ² at 2.1- 2.4 V. A steady state run at 1 A/cmÂ² showed stable performance at 1.82 V for over 12000 hours, with no sign of membrane or catalyst degradation. These results demonstrate that high current densities and long lifetimes can be obtained with AEM electrolyzers without requiring precious metal catalysts.