Anion Exchange Membrane (AEM) electrolysis combines concepts from alkaline and PEM. Although AEM can potentially offer the best of both worlds compared to conventional technology, challenges such as oxygen sensitivity, stack scale-up and current density still need to be addressed. Germany-based Enapter is leading the commercialization of AEM systems, with other electrolyzer manufacturers now developing their own products.
Alkaline electrolyzers will play a significant role in renewable ammonia production going forward. Historical developments in electrocatalysts and optimized stack design have already addressed some of the key bottlenecks in the technology, and new developments will enable flexible operations at higher pressures.
Recent PEM technology developments have centered around two issues: i) the relative scarcity of Iridium, and ii) the membrane thickness, limiting the efficiency of the PEM electrolyzer. This week we explore new approaches to both, including work by precious metal company Heraeus, and Norwegian start-up HyStar.
Our June episode of Ammonia Project Features focused on a new project in Niigata prefecture, which will demonstrate low-carbon, fossil-based ammonia production with a capacity of 500 tonnes per year. As part of the project, Japanese government organization JOGMEC will work with INPEX to develop enhanced gas recovery & CO2 sequestration monitoring technologies. Tsubame BHB will deploy its low-temperature, low-pressure ammonia synthesis technology based on an electride-supported catalyst developed at the Tokyo Institute of Technology.
Meet JOGMEC and Tsubame BHB to explore a new CCS-based ammonia production project in Japan, utilising enhanced gas recovery (EGR) for CCS, as well as Tsubame’s alternative technology to Haber-Bosch for ammonia synthesis.