Hydrogen Oxidation Activity of SOFC Anodes with Metal Oxide Addition

Abstract

Metal oxide addition is one of the major techniques to improve the performance of SOFC cermet anodes. However, the effects of the metal oxide addition on hydrogen oxidation activity of the anodes have not been clarified so far. In this study, Ni-CaO/YSZ anodes were prepared to examine the interaction between YSZ and Ca species. The hydrogen oxidation activities of the prepared anodes were investigated by introducing electrochemical impedance spectroscopy. The anodic resistance of the electrochemical hydrogen oxidation was determined by impedance fitting, and its temperature dependency was analyzed by means of Arrhenius plots. It was found that activation energy of the reaction was decreased with the CaO addition, suggesting the possibility of the SOFC operation at lower temperatures.

Calcium-Modified Ni-SDC Anodes in Solid Oxide Fuel Cells for Direct Dry Reforming of Methane

“…S1b). 37,39 Characteristic frequencies of R2-CPE2 and R3-CPE3 for the Ni-YSZ anode are 100-1000 Hz and 1-10 Hz, respectively.…”