Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 47, Issue 56, Pages 23514-23519Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2022.05.174
Keywords
Solid oxide electrolysis cells (SOECs); Solid oxide fuel cells (SOFCs); Hydrogen production; Current efficiency; Polarization
Categories
Funding
- National Natural Science Foundation of China [22109124]
- Depart- ment of Human Resources and Social Security of Shaanxi Province, Selected Funding Project for Science and Technology Activities of Overseas Scholars [16]
- Shaanxi Provincial Science and Tech- nology Department [2021JQ-673]
- Education Department of Shaanxi Provincial Government [21JK0644]
- Science Technology Development Department of CNTAC [2021038, 2021042]
- Young Talent fund of University Association for Science and Technology in Shaanxi, China [20210421, BS1610, BS1609]
- Xi 'an Polytechnic Uni- versity [202110709056, 202110709032]
- National College Student Innovation and Entrepre- neurship Training Program
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Deficient or non-linear hydrogen production is observed for the first time in large-scale steam electrolysis cells. Steam starvation affects the linearity of hydrogen production, with the Ni/NiO redox process playing a role in SOEC operations. The SOEC shows endurance to 10 hours of extreme polarization through electric conduction and oxygen vacancy transportation.
Deficient, or non-linear hydrogen production is for the first time experimentally observed in large-scale planar Ni-YSZ/YSZ/LSM-YSZ steam electrolysis cells. The apparent coinciding of the concentration polarization and Faraday efficiency decrease at certain current density (-0.5Acm(-2) or -0.6Acm(-2) for selected steam content) indicates that steam starvation appears to affect the hydrogen production's linearity, which in essence the Ni/NiO redox process is believed to play a role in such normal SOEC operations. The SOEC survives 10h extreme polarization through electric conduction and oxygen vacancy transportation. Rational SOEC working mode is recommended accordingly. The present work is complementary for the general application of the Faraday's Law to estimate hydrogen production, and to further evaluate the SOEC's overall characteristics. (C) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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