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100 1 _ |a Dittrich, Lucy
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245 _ _ |a High-Temperature Co-Electrolysis: A Versatile Method to Sustainably Produce Tailored Syngas Compositions
260 _ _ |a Pennington, NJ
|c 2019
|b Electrochemical Soc.
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520 _ _ |a High-temperature co-electrolysis of carbon dioxide and steam is a promising method to produce ‘white’ syngas by making use of renewable energy and carbon dioxide as sustainable feedstock. The technological key advantage is the possibility to tailor syngas compositions over a broad range. This paper presents a systematic investigation of the syngas tailoring process by establishing relationships between feed gas compositions and flow rates to the syngas ratio. A linear dependence between the H2O:CO2 ratio in the feed gas and the H2:CO ratio in the output gas was observed. Furthermore, the syngas ratio remains mostly invariant upon variations in electrochemical potential and fluctuating gas utilizations/flow rates during operation of a co-electrolysis cell. Most importantly, the co-electrolysis performance was demonstrated to operate at high current densities of up to 3.2 A·cm−2 over a broad range of feed gas compositions with faradaic efficiencies of nearly 100%. The possibility to operate co-electrolysis under transient load conditions renders this method particularly suitable in future scenarios of intermittent availability of renewables. The results described here illustrate the versatility of co-electrolysis, which can produce all relevant syngas compositions in a single-step process at constantly high performance.
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700 1 _ |a Nohl, Markus
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700 1 _ |a Jaekel, Esther E.
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700 1 _ |a Foit, Severin
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700 1 _ |a de Haart, L. G. J.
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700 1 _ |a Eichel, Rüdiger-A.
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773 _ _ |a 10.1149/2.0581913jes
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