La_(1-x)Sr_xCoO_(3-δ)氧化物电极的电子结构

ELECTRONIC STRUCTURE OF La_(1-x)Sr_xCoO_(3-δ)OXIDE ELECTRODES

通过ＸＰＳ和循环伏安（ＣＶ）研究了Ｌａ(１－ｘ)ＳｒｘＣｏＯ(２－δ)系列钙钛矿氧化物的非化学计量行为，研究结果表明，氧化物中 Ｌａ和 Ｓｒ的化学状态受其相对含量的影响较小，一部分 Ｃｏ３＋却由于Ｓｒ取代 Ｌａ而转变成高价态 Ｃｏ４＋，晶格氧空穴浓度也随

Nonstoichiometry behavior of La_(1-x)Sr_xCoO_(3-δ) series perovskite oxides was studied by XPS and cyclic voltammetry. The results indicated that the chemical states of La and Sr in the oxides were barely influenced by their relative content. Substitution of Sr for La results in the valence state change of some cobalt ions from Co3+ to Co4+ and the increase of the lattice oxygen vacancies.