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Hydrogen Production by the High Temperature Steam Electrolysis of NiO/YSZ/Pt Cell  

Yu, Ji-Haeng (Energy Materials Research Center, Korea Institute of Energy Research)
Kim, Young-Woon (Energy Materials Research Center, Korea Institute of Energy Research)
Lee, Shi-Woo (Energy Materials Research Center, Korea Institute of Energy Research)
Seo, Doo-Won (Energy Materials Research Center, Korea Institute of Energy Research)
Hong, Ki-Suk (Energy Materials Research Center, Korea Institute of Energy Research)
Han, In-Sub (Energy Materials Research Center, Korea Institute of Energy Research)
Woo, Sang-Kuk (Energy Materials Research Center, Korea Institute of Energy Research)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.17, no.1, 2006 , pp. 62-68 More about this Journal
Abstract
High temperature electrolysis is a promising technology to produce massively hydrogen using renewable and nuclear energy. Solid oxide fuel cell materials are candidates as the components of steam electrolysers. However, the polarization characteristics of the typical electrode materials during the electrolysis have not been intensively investigated. In this study, NiO electrode was deposited on YSZ electrolyte by spin coat process and firing at $1300^{\circ}C$. Pt electrode was applied on the other side of the electrolyte to compare the polarization characteristics with those by NiO during electrolysis. The $H_2$ evolution rate was also monitored by measuring the electromotive force of Lambda probe and calculated by thermodynamic consideration. At low current density, Pt showed lower cathodic polarization and thus higher current efficiency than Ni, but the oxidation of Ni into NiO caused the increase of anodic resistance with increasing current density. High overpotential induced high power consumption to produce hydrogen by electrolysis.
Keywords
Hydrogen production; Steam electrolysis; Oxygen ion conductor; Zirconia; Polarization;
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