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High-temperature Co-electrolysis of CO2/H2O and direct methanation over Co-impregnated SOEC. Bimetallic synergy between Co and Ni
Abstract
To study the synergy between the transition metals for enhancing the electrochemical and chemical activity, a series of SOECs were modified with a small amount of Co ions, namely 1.8, 3.6, and 5.4 wt% in the reduced state. The addition of βCD into the precursor solution allowed for extremely fine dispersion of Co species across the Ni-YSZ cermet structure. The sample containing 3.6 wt% Co reached an outstanding over 2.5-times-higher concentration of CH4 in the outlet stream. At the same time, the Co greatly enhanced the electrochemical efficiency of water and CO2 co-electrolysis. Full characterization involving STXM imaging allowed for better understanding of the synergy between the Ni and Co host metal and made it possible to find the causes of the increased activity. It revealed the complexity of the substructures formed within the electrode. A novel discovery was described regarding the NiCo2O4 spinel structure subjected to the O2-TPO measurements. Despite the applied oxidizing atmosphere, the catalyst evolved oxygen at elevated temperatures in a reversible manner. The performance tests indicated the roles of both rWGS and direct electrolysis of CO2 in the electroreduction process. The addition of Co did not influence the prolonged degradation of the cell.
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Authors (9)
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Marcin Zając dr inż,
- National Synchrotron Radiation Centre SOLARIS, Jagiellonian University
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Krzysztof Matlak
- National Synchrotron Radiation Centre SOLARIS, Jagiellonian University
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Barbara Wolanin
- National Synchrotron Radiation Centre SOLARIS, Jagiellonian University
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Sea-Fue Wang
- Department of Materials and Mineral Resources Engineering, National Taipei University of Technology
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Anna Mandziak
- National Synchrotron Radiation Centre SOLARIS, Jagiellonian University
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Full text
- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.ijhydene.2022.08.057
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Details
- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
no. 47,
pages 35017 - 35037,
ISSN: 0360-3199 - Language:
- English
- Publication year:
- 2022
- Bibliographic description:
- Błaszczak P., Zając M., Ducka A., Matlak K., Wolanin B., Wang S., Mandziak A., Bochentyn B., Jasiński P.: High-temperature Co-electrolysis of CO2/H2O and direct methanation over Co-impregnated SOEC. Bimetallic synergy between Co and Ni// INTERNATIONAL JOURNAL OF HYDROGEN ENERGY -Vol. 47,iss. 82 (2022), s.35017-35037
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.ijhydene.2022.08.057
- Sources of funding:
- Verified by:
- Gdańsk University of Technology
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