Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
Currently, the costs of hydrogen production from water electrolysis are almost always dominated by the costs of the electricity used to power the water splitting process. However, this techno-economic paradigm for electrolyzer technology is going to change in a renewable energy future in which low-cost electricity generated from solar and wind will be available in large quantities—but only for a small fraction of the day. In this future scenario, the capital costs of the electrolyzer system will become a much larger percentage of the costs of hydrogen production from water electrolysis. With this as motivation, our lab is developing simple and scalable membraneless electrolyzers and PV-electrolyzers based on angled mesh flow-through electrodes. These membraneless electrolyzers have the potential for lower capital costs due to their simpler construction, fewer parts, and potential for longer lifetime in the absence of membranes that can be prone to fouling and degradation. Recently, we have demonstrated 3D printed membraneless electrolyzers based on flowing electrolyte through two angled mesh flow-through electrodes, which results in efficient separation of the H2 and O2 product gases with minimal product crossover. Ongoing research builds off of this initial study by using in situ high speed video analysis to quantitatively measure current density distributions along angled mesh electrodes under various operating conditions. Experimental observations are compared with modeled current density distributions, providing a useful framework for further optimizing device performance and better understanding the hydrodynamics associated with gas-evolving flow-through electrodes.
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