Journal
NATURE CATALYSIS
Volume 5, Issue 3, Pages 185-192Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41929-022-00749-8
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Funding
- National Research Council Materials for Clean Fuels program [MCF-109]
- Ontario Ministry of Colleges and Universities [ORF-RE08-034]
- Natural Sciences and Engineering Research Council (NSERC) of Canada [RGPIN-2017-06477]
- China Scholarship Council [201906745001]
- A*STAR Young Individual Research Grant [A2084c0180]
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Improved electrochemical conversion of CO2 to EO is achieved using modified catalysts and a paired system, resulting in comparable energy input to existing industrial processes.
The electrochemical production of ethylene oxide (EO) from CO2, water and renewable electricity could result in a net consumption of CO2. Unfortunately existing electrochemical CO2-to-EO conversions show impractical Faradaic efficiency (FE) and require a high energy input. Here we report a class of period-6-metal-oxide-modified iridium oxide catalysts that enable us to achieve improved CO2-to-EO conversion. Among barium, lanthanum, cerium and bismuth, we find that barium-oxide-loaded catalysts achieve an ethylene-to-EO FE of 90%. When we pair this with the oxygen reduction reaction at the cathode, we achieve an energy input of 5.3 MJ per kg of EO, comparable to that of existing (emissions-intensive) industrial processes. We have also devised a redox-mediated paired system that shows a 1.5-fold higher CO2-to-EO FE (35%) and uses a 1.2 V lower operating voltage than literature benchmark electrochemical systems.
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