TY  - JOUR
AU  - Dittrich, Lucy
AU  - Nohl, Markus
AU  - Jaekel, Esther E.
AU  - Foit, Severin
AU  - de Haart, L. G. J.
AU  - Eichel, Rüdiger-A.
TI  - High-Temperature Co-Electrolysis: A Versatile Method to Sustainably Produce Tailored Syngas Compositions
JO  - Journal of the Electrochemical Society
VL  - 166
IS  - 13
SN  - 0013-4651
CY  - Pennington, NJ
PB  - Electrochemical Soc.
M1  - FZJ-2019-04250
SP  - F971 - F975
PY  - 2019
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000482551900002
DO  - DOI:10.1149/2.0581913jes
UR  - https://juser.fz-juelich.de/record/864472
ER  -