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Abstract: The electronic structure of the protonic conductor Y-doped BaCeO3 (BaCe0.90Y0.10O3−δ ) has been studied by soft-X-ray spectroscopy. The valence band of H2-annealed BaCe0.90Y0.10O3−δ , which consists of the O 2p states hybridized with Ce 4f states, shifts to the higher binding energy side by approximately 0.4 eV. In the air-annealed BaCe0.90Y0.10O3−δ , holes and acceptor levels are observed at the top of the valence band and just above E F, respectively. Their intensities are lower in H2-annealed BaCe0.90Y0.10O3−δ . These findings indicate directly that hydrogen doping compensates for the presence of the holes. [Copyright &y& Elsevier]

Abstract: The electronic structure of protonic conductor SrZr1–x M x O3–δ (M=Y3+, Sc3+) has been studied by soft-X-ray spectroscopy. The valence band is mainly composed of O 2p state. The conduction band is composed of Zr 4d state. The holes and the acceptor level are observed at the top of valence band and just above the Fermi level (E F), respectively. In H2-annealed SrZr1–x M x O3–δ (M=Y3+, Sc3+), their intensities decrease and the hydrogen-induced level is created at just below E F. The energy separation between the bottom of the hydrogen-induced level and the top of valence band agrees with the activation energy estimated from the electrical conductivity. [Copyright &y& Elsevier]