Carbon Dioxide Electrolysis with Solid Oxide Electrolyte Cells for Oxygen Recovery in Life Support Systems

High Temperature Electrolysis in Alkaline Cells, Solid Proton Conducting Cells, and Solid Oxide Cells

“…The reversibility of solid oxide fuel cells (SOFCs), i.e., also operating as a solid oxide electrolysis cell (SOEC), was demonstrated for both H 2 O ,,− and CO 2 ,− in the early 1980s, and research was focused on the use of heat from solar concentrators or waste heat from power stations/nuclear reactors. , Although the cells are reversible, slightly lower performance is normally observed in electrolysis mode. For both H 2 O/H 2 and CO 2 /CO mixtures a marginally higher activity toward oxidation (operation in fuel cell mode) is found in comparison to reduction (operation in electrolysis mode). ,,− On the basis of a theoretic study, it was suggested that this difference between oxidation and reduction lies in the slower diffusion of H 2 O compared to H 2 .…”

Surface Chemistry of Perovskite-Type Electrodes During High Temperature CO2 Electrolysis Investigated by Operando Photoelectron Spectroscopy

“…A further, though somewhat exotic, application of CO 2 electrolysis is the production of storable fuel as well as oxygen during space missions such as a long-term human exploration of planet Mars. 7 , 8 …”

“…With sustainably produced CO and H 2 (commonly referred to as syngas) these processes thus offer the possibility of storing excess renewable energy in a form that is compatible with the existing fuel infrastructure. A further, though somewhat exotic, application of CO 2 electrolysis is the production of storable fuel as well as oxygen during space missions such as a long-term human exploration of planet Mars. , …”

Co-Electrolysis of Steam and Carbon Dioxide in Solid Oxide Cells

“…2,[5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] These studies were performed on SOCs based on metal cermet electrodes of palladium, platinum or nickel. 2,[5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] The first studies of CO 2 electrolysis were performed in platinum and nickel based SOCs at NASA as a means for producing oxygen. 2,[9][10][11]13,15 Co-electrolysis has only been shown in a few studies, 7,[21][22][23][24][25][26][27] and there are discrepancies whether CO is produced via the ...…”

“…2,[5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] The first studies of CO 2 electrolysis were performed in platinum and nickel based SOCs at NASA as a means for producing oxygen. 2,[9][10][11]13,15 Co-electrolysis has only been shown in a few studies, 7,[21][22][23][24][25][26][27] and there are discrepancies whether CO is produced via the reverse water gas shift reaction solely and that no electrolysis of CO 2 occur 25,26 or if CO is produced both via the reverse water gas shift reaction and via electrolysis of CO 2 . 7,23 It is the aim of the present study to investigate the reaction mechanism during co-electrolysis and to investigate the reaction mechanism of the electrochemical reduction of H 2 O and CO 2 , as well as oxidation of H 2 and CO in mixtures of H 2 O -H 2 , CO 2 -CO and H 2 O -CO 2 -H 2 -CO to gain insight in the reaction mechanism and to establish the effect of the Water Gas Shift (WGS)/Reverse Water Gas Shift (RWGS) reaction.…”