%0 Journal Article
%A Dittrich, Lucy
%A Nohl, Markus
%A Jaekel, Esther E.
%A Foit, Severin
%A de Haart, L. G. J.
%A Eichel, Rüdiger-A.
%T High-Temperature Co-Electrolysis: A Versatile Method to Sustainably Produce Tailored Syngas Compositions
%J Journal of the Electrochemical Society
%V 166
%N 13
%@ 0013-4651
%C Pennington, NJ
%I Electrochemical Soc.
%M FZJ-2019-04250
%P F971 - F975
%D 2019
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000482551900002
%R 10.1149/2.0581913jes
%U https://juser.fz-juelich.de/record/864472