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Barium carbonate as synergistic catalyst for H2O/CO2 reduction reaction at Ni-yttria stabilized zirconia cathode of solid oxide electrolysis cell

Abstract

BaCO3 is primarily demonstrated as an excellent synergistic catalyst for efficient electro-reduction of H2O/CO2 to H2/CO at the state-of-the-art Ni-YSZ (yttria-stabilized zirconia) cathodes for solid oxide electrolysis cells (SOECs) with YSZ electrolytes and strontium doped lanthanum manganite oxygen electrodes. BaCO3 nanoparticles, which are deposited to porous Ni-YSZ using infiltration process, can significantly improve the SOEC performance such as increasing the electrode interfacial polarization conductivity over 50% and promoting the electrolysis current density by a factor up to 2 for the electrolysis of H2O to H2, CO2 to CO, and co-electrolysis H2O-CO2 to H2-CO at 800 °C. In addition, it seems that BaCO3 can improve the SOEC durability for the co-electrolysis of H2O-CO2. The improvement is associated with enhanced surface charge transfer process, which is the rate-determining step for the reduction reaction, as showed by analyzing the AC impedance spectrum measured with three-electrode configuration. The highest improvement is achieved with CO2 reduction possibly due to the additional enhancement in the adsorption/dissociation process by BaCO3 as revealed with temperature programmed CO2 desorption analysis.

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Publication details

The article was received on 19 Sep 2017, accepted on 07 Jan 2018 and first published on 08 Jan 2018


Article type: Paper
DOI: 10.1039/C7TA08249E
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Barium carbonate as synergistic catalyst for H2O/CO2 reduction reaction at Ni-yttria stabilized zirconia cathode of solid oxide electrolysis cell

    M. Zheng, S. Wang, Y. Yang and C. Xia, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C7TA08249E

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