Abstract
Evaporation of Ni in the form of Nickel Hydroxide (Ni(OH)2) in Solid Oxide Fuel Cell (SOFC) anodes (Ni-YSZ) is one of the major causes of anode degradation. Transition metals such as Fe, Cr and Co can act as sacrificial anodes for Ni, because of lower Gibbs Free Energy values for the formation of their corresponding volatile hydroxides as compared to Ni (OH)2. The transition metals were added to porous Ni-YSZ anode scaffold by infiltration method. Nano-sized particles were sporadically dispersed on the Ni-YSZ surface, confirmed by Scanning Electron Microscopy (SEM). X-Ray Diffraction (XRD) patterns show a very good chemical compatibility between the added metals and Ni-YSZ anodes. Symmetric cells were then prepared and the Area-Specific Resistance (ASR) was monitored at 1000 °C, with a fuel gas containing 25 vol.% H2, 75 vol.% N2, for more than 250 h . To control accelerated evaporation condition of anode, relative humidity in anode gas was fixed at 12 %. The difference in the amount of the added metal before and after long-tern test was determined by EDS analysis. Change in the grain size distribution of Ni particles and Triple Phase Boundary (TPB) density, before and after long term test were calculated by image analysis. Well-defined relations were obtained among ASR change rate determined from electrochemical measurements and grain size distribution, TPB density change rate calculated from image analysis.
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The research presented in this paper was supported by the New & Renewable Energy R&D Program under the Ministry of Knowledge Economy (MKE).
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Khan, M.S., Lee, SB., Song, RH. et al. Effect of infiltrated transition metals on nickel morphology change and area-specific resistance of Ni-YSZ based SOFC anode during long-term operation. J Electroceram 35, 81–89 (2015). https://doi.org/10.1007/s10832-015-9995-8
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DOI: https://doi.org/10.1007/s10832-015-9995-8