サマリウム固溶セリア電解質とサーメット電極からなる固体酸化物形燃料電池の電気化学特性

概要

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Cermet electrodes for Sm-doped ceria electrolyte (SDC) with a composition Ce_<0.8>Sm_<0.2>O_<1.9> were prepared by freeze drying of the SDC-H_2PtCl_6-Cu(NO_3)_2 suspension (cathode) and the SDC-Ni(NO_3)_2-SnO_2 suspension (anode). The freeze-dried powders decomposed at 873 K and were sintered at 1323-1573 K in air to investigate phase compatibility, microstructures and electrical conductivity. The dominant factors for the terminal voltage drop of the present fuel cell were the resistance of solid electrolyte and the overpotentials at both electrodes. Addition of CuO to SDC-Pt cathode and addition of SnO_2 to SDC-Ni anode reduced the overpotentials at the electrodes and increased the terminal voltage and power density of the cell with SDC electrolyte (500μm thickness) using a 97 vol% H_2-3 vol% H_2O fuel. The highest power density was 183 mW/cm^2 at 1073 K.
社団法人日本セラミックス協会の論文
2005-09-01