Reduction of CO2 to CO at Cu-ceria-gadolinia (CGO) cathode in solid oxide electrolyser
Reduction of CO2 to CO at Cu-ceria-gadolinia (CGO) cathode in solid oxide electrolyser
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DOI：
10.1007/s10800-013-0566-x
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发表时间：
2013-11-01
影响因子：
2.9
通讯作者：
Kleiminger, L.
中科院分区：
文献类型：
--
作者：
Cheng, C-Y;Kelsall, G. H.;Kleiminger, L.
研究了在高温固体氧化物电解槽（CO2-CO，Cu/CGO）中使用Cu/CGO阴极进行CO2还原为CO的可行性|YSZ| YSZ/LSM| LSM，环境空气）。通过在1，000 A ℃下烧结Cu/CGO浆料5 h，获得多孔Cu/CGO电极在YSZ电解质上的粘附层。对于在750摄氏度和50：50的CO2-CO进料下的CO2还原，用Ni/YSZ和Cu/CGO阴极获得了相当的性能; CO氧化速率比CO2还原速率快。Cu/CGO电极的欧姆和极化电阻都随着CO2：CO进料比的降低而降低。在电解模式中，在高达1.5V的电位差下，在Cu/CGO阴极上实现了用于将CO2还原成CO的100%电流效率，高于该电位差，YSZ电解质的电子电导率增加，导致有效电流效率的损失。电位差进一步增加到ca。> 2.3V由于其部分分解而对YSZ电解质造成不可逆的损害。在用Cu/CGO阴极在1.85 V和750 A摄氏度下操作电解槽用于CO2还原的2小时期间，没有明显的性能劣化、Cu烧结/迁移、碳沉积或电极分层。
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.