Details

Autor(en) / Beteiligte

• Cheng, C-Y.
• Kelsall, G. H.
• Kleiminger, L.

Titel

Reduction of CO2 to CO at Cu–ceria-gadolinia (CGO) cathode in solid oxide electrolyser

Ist Teil von

• Journal of applied electrochemistry, 2013-11, Vol.43 (11), p.1131-1144

Ort / Verlag

Dordrecht: Springer Netherlands

Erscheinungsjahr

2013

Quelle

SpringerNature Journals

Beschreibungen/Notizen

• The feasibility was investigated of using a Cu/CGO cathode for CO 2 reduction to CO in a high temperature solid oxide electrolyser (CO 2 –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 °C for 5 h. Comparable performance was obtained with Ni/YSZ and Cu/CGO cathodes for CO 2 reduction at 750 °C and a 50:50 CO 2 –CO feed; CO oxidation rates were faster than CO 2 reduction rates. Ohmic and polarisation resistances of the Cu/CGO electrode all decreased with decreasing CO 2 :CO feed ratio. In the electrolytic mode, 100 % current efficiency for CO 2 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 °C for CO 2 reduction with a Cu/CGO cathode.