Self-Regeneration Pd-Perovskite Anode for SOFC

概要

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A Pd doped perovskite La0.85Sr0.15Cr0.9Ni0.05Pd0.05O3 (LSCNP) was investigated as a candidate for a metal-free anode material of solid oxide fuel cell in comparison with La0.85Sr0.15Cr0.9Ni0.1O3 (LSCN). The performance of anodes of LSCNP and LSCN with and without mixing Sm doped Ceria (SDC) was measured using H2 and dry-CH4 as fuel. The maximum current density of the cell in H2 increased approximately twofold by the doping of Pd for the anode with or without SDC. The rate of the anodic reaction in H2 was enhanced mainly by the catalytic activity of LSCNP and additionally by SDC. When dry-CH4 was used as the fuel, the cell with LSCNP-SDC anode was the only cell which was able to perform power generation. Both the doping of Pd to the perovskite and the mixing of SDC contributed to the ability to operate SOFC in dry CH4. The anode reaction did not occur when SDC was not in the anode, indicating that the supply of oxide ion was the rate determining step. Pd, which is considered to deposit from LSCNP in reducing atmosphere, seemed to be the reaction site of the electrochemical methane oxidation since the reaction rate was low for LSCN-SDC. Although slight indication of carbon deposition was observed, Pd doped perovskite would be a good candidate for metal-free SOFC anode.