Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 10, Issue 3, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2022.107836
Keywords
Electrochemical engineering; Electrochemical reduction of CO2; Power to chemicals; Zero-gap electrolyzers; Metal-nitrogen-doped carbons
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Funding
- Research Foundation - Flanders (FWO) [HBC.2017.0692]
- European Fund for Regional Development [76245]
- cluster cSBO Catalisti Moonshot project CO2PERATE of the Flanders Innovation & Entrepreneurship (VLAIO) [2S03-019]
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Zero-gap electrolysers with metal-nitrogen-doped carbon catalysts achieve high energy efficiencies in the electrosynthesis of carbon-based products from waste CO2. However, there are challenges that need to be addressed for further improvement.
Zero-gap electrolysers lead the race for industrial implementation in the electrosynthesis of carbon-based products from waste CO2. Due to their compact structure, these reactors have lower ohmic losses and attain higher energy efficiencies than the alternatives. However, most research conducted on these electrochemical cells dismisses key product-specific considerations. In this work, we optimised a zero-gap system and tuned it for the production of both formate and carbon monoxide. We assessed the industrial applicability of alternative metal-nitrogen-doped carbon catalysts and benchmarked them with state-of-the-art metallic nanoparticles. We achieved energy efficiencies as high as 50.4% for the production of HCOO- and 58.0% for the production of CO (86.9 mA cm(-2)). Finally, a rapid degradation study was conducted for start-stop operation, which revealed the current challenges of this novel family of catalysts. This study constitutes an essential step in the direction of upscaled zero-gap CO2 electrolysis with metal-nitrogen-doped carbon catalysts.
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