Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.064
Publication date: 18th July 2019
Electrochemical CO2and CO conversions provide direct pathways to harness renewable electricity for chemical and fuel synthesis. This talk will describe our recent work to elucidate design principles for electroreduction catalysts and to engineer high-performance gas diffusion cells. For catalyst design principles, we have pioneered the use of grain boundaries to create metastable active surfaces. I will describe a structural model to explain grain boundary effects1and our recent efforts to map grain-boundary-activity relationships over diverse grain boundary types. For electrochemical cell development, we are focused on CO electrolysis to produce multi-carbon products. We envision that these cells will be combined with upstream CO2-to-CO conversion processes to recycle CO2into feedstock chemicals. Practical electrosynthesis must simultaneously achieve high synthesis rates and high single-pass conversions of CO at low cell potentials to maximize the energy efficiency and minimize the separation costs. To this end, I will describe cells that achieve >150 mA cm2CO reduction to ethylene and C2+oxygenates at <2.1 V with >70% single-pass conversion. I will discuss cell configurations and operating parameters that affect performance and the pathway to scale up.
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