期刊
JOURNAL OF APPLIED ELECTROCHEMISTRY
卷 43, 期 11, 页码 1131-1144出版社
SPRINGER
DOI: 10.1007/s10800-013-0566-x
关键词
Carbon dioxide reduction; Solid oxide electrolyser; Copper cathode; Ceria-gadolinia; Yttria-stabilised zirconia (YSZ)
资金
- UK Engineering and Physical Sciences Research Council
- EPSRC [EP/K035274/1, EP/H046380/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H046380/1, EP/K035274/1, 1162167] Funding Source: researchfish
The feasibility was investigated of using a Cu/CGO cathode for CO2 reduction to CO in a high temperature solid oxide electrolyser (CO2-CO, Cu/CGO|YSZ|YSZ/LSM|LSM, ambient air). An adherent layer of porous Cu/CGO electrode on YSZ electrolyte was achieved by sintering Cu/CGO paste at 1,000 A degrees C for 5 h. Comparable performance was obtained with Ni/YSZ and Cu/CGO cathodes for CO2 reduction at 750 A degrees C and a 50:50 CO2-CO feed; CO oxidation rates were faster than CO2 reduction rates. Ohmic and polarisation resistances of the Cu/CGO electrode all decreased with decreasing CO2:CO feed ratio. In the electrolytic mode, 100 % current efficiency for CO2 reduction to CO was achieved on the Cu/CGO cathode at potential differences up to 1.5 V, above which the electronic conductivity of the YSZ electrolyte increased, causing a loss in effective current efficiency. Further increase in potential difference to ca. > 2.3 V caused irreversible damage to the YSZ electrolyte due to its partial decomposition. No significant performance degradation, Cu sintering/migration, carbon deposition or electrode delamination was evident during 2 h of operating the electrolyser at 1.85 V and 750 A degrees C for CO2 reduction with a Cu/CGO cathode.
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