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http://dx.doi.org/10.3740/MRSK.2008.18.7.384

Comparison of Microstructure and Electrical Conductivity of Ni/YSZ and Cu/YSZ Cathode for High Temperature Electrolysis  

Kim, Jong-Min (Plant Engineering Center, Institute for Advanced Engineering)
Shin, Seock-Jae (CNL Energy)
Woo, Sang-Kook (Energy Materials Research Center, Korea Institute of Energy Research)
Kang, Kae-Myung (Department of Materials Engineering, Seoul National University of Technology)
Hong, Hyun-Seon (Plant Engineering Center, Institute for Advanced Engineering)
Publication Information
Korean Journal of Materials Research / v.18, no.7, 2008 , pp. 384-388 More about this Journal
Abstract
Hydrogen production via high high-temperature steam electrolysis consumes less electrical energy than compared to conventional low low-temperature water electrolysis, mainly due to the improved thermodynamics and kinetics at elevated temperaturetemperatures. The elementalElemental powders of Cu, Ni, and YSZ are were used to synthesize high high-temperature electrolysis cathodecathodes, of Ni/YSZ and Cu/YSZ composites, by mechanical alloying. The metallic particles of the composites were uniformly covered with finer YSZ particles. Sub-micron sized pores are were homogeneously dispersed in the Ni/YSZ and Cu/YSZ composites. In this study, The cathode materials were synthesized and their Characterizations properties were evaluated in this study: It was found that the better electric conductivity of the Cu/YSZ composite was measured improved compared tothan that of the Ni/YSZ composite. Slight A slight increase in the resistance can be produced for in a Cu/YSZ cathode by oxidation, but it this is compensated offset for by a favorable thermal expansion coefficient. Therefore, Cu/YSZ cermet can be adequately used as a suitable cathode material of in high high-temperature electrolysis.
Keywords
hydrogen production; high temperature electrolysis; cathode; microstructure; mechanical alloying;
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