Assessment of Pressure Effects on High Temperature Steam Electrolysis Based on Solid Oxide Technology

The cathode-supported tubular solid oxide electrolysis cell (SOEC) fabricated by dip-coating and co-sintering techniques have been studied for high temperature steam electrolysis application. The microstructure and electrochemical performeances were investigated in both SOEC and solid oxide fuel cell (SOFC) modes. In SOFC model, the maximum power densitity reached 390.7, 311.0 and 248.3 mW cm-2 at 850, 800, and 700 °C, respectively, running with H2 (105 mL min-1) and O2 (70 mL min-1) as working gases. In SOEC mode, the results indicated that the steam ratio had a strong impact on the performance of the tubular SOEC, and it’s better to operate the tubular SOEC in high steam ratio. I-V curves and EIS results suggested that the microstructure of the tubular SOEC needs to be optimized for mass transportation.

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Electrochemical Investigation of La0.2Sr0.8TiO3+δ-Ce0.8Sm0.2O2-δ Composite Cathode for the Direct High Temperature Steam Electrolysis

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.936.464 ◽

2014 ◽

Vol 936 ◽

pp. 464-470

Author(s):

Guo Jian Wu ◽

Kui Xie ◽

Yu Cheng Wu

Keyword(s):

Electrical Conductivity ◽

High Temperature ◽

Composite Cathode ◽

Solid Oxide ◽

Electrochemical Investigation ◽

Reducing Gas ◽

Direct Steam ◽

Ion Conducting ◽

High Temperature Steam ◽

Oxide Ion

This paper investigates a composite cathode La0.2Sr0.8TiO3+δ-Ce0.8Sm0.2O2-δ (LSTO-SDC) for the direct steam electrolysis in an oxide-ion-conducting solid oxide electrolyzer. The dependences of electrical conductivity of the reduced LSTO on temperature and oxygen partial pressure are studied and further correlated to the electrochemical properties of the cathode in symmetric cell LSTO-SDC/YSZ/LSTO-SDC and solid oxide electrolyzer LSTO-SDC/YSZ/LSM-SDC, respectively. Current efficiencies of the solid oxide electrolyzer with LSTO-SDC cathode were found to be 92.38% and 91.17% with or without reducing gas flowing over them under the applied voltage of 1.8 V at 800 °C, respectively.

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Thermodynamic analysis of high temperature steam and carbon dioxide systems in solid oxide cells

Sustainable Energy & Fuels ◽

10.1039/c9se00030e ◽

2019 ◽

Vol 3 (8) ◽

pp. 2076-2086 ◽

Cited By ~ 2

Author(s):

Petr Vágner ◽

Roman Kodým ◽

Karel Bouzek

Keyword(s):

Carbon Dioxide ◽

High Temperature ◽

Thermodynamic Analysis ◽

Solid Oxide ◽

High Temperature Steam

A thermodynamic analysis of the process in solid oxide cells with H2O and CO2 (SOCc) was performed based on the data available in the open literature.

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