钙钛矿型La_(1-x)Sr_xFeO_3和LaNiO_3纳米晶在双功能氧电极上的应用

Application of La _1- x Sr_ xFeO _3 and LaNiO_ 3 perovskite complex oxides nanocrystal at bifunctional oxygen electrode

采用溶胶－凝胶法制备了双功能氧电极催化剂Ｌａ１－ｘ Ｓｒｘ ＦｅＯ３ 和ＬａＮｉＯ３ 纳米晶，用ＸＲＤ、ＴＥＭ 技术对催化剂进行了表征，并采用稳态极化曲线法和循环伏安法考察了不同催化剂对氧电极的催化活性，充放电实验进行了寿命考查。结果表明，纳米级钙钛矿型复合氧化物Ｌａ１－ｘ ＳｒｘＦｅＯ３ 和ＬａＮｉＯ３ 作为催化剂用在双功能氧电极上具有良好的双向催化性能，并且纳米晶Ｌａ１－ｘ Ｓｒｘ ＦｅＯ３ 对氧阴极还原催化性能在ｘ＝ ０．５ 及ｘ＝ ０．２５时最佳，对氧阳极析出催化性能在ｘ＝ ０．７５时最佳。

La 1 x Sr xFeO 3 and LaNiO 3 perovskite complex oxides nanocrystal which can be used as the catalysts of bifunctional oxygen electrode were prepared by Sol Gel method.The characterization of the samples was carried out by XRD and TEM technology.The size of the crystals was measured to be about 14 nm～17 nm by Spread X ray Method and TEM.Their electrocatalytic activity at oxygen electrode were investigated by steady polarization curves and cyclic voltammetry method.The results show that La 1 x Sr xFeO 3 and LaNiO 3 nanocrystal used as catalyst of bifunctional oxygen electrode have excellent catalytic activity and the La 1-x Sr xFeO 3 nanocrystal is better than LaNiO 3 nanocrystal.Data of electrochemical measurements show that the activity of oxygen cathodic catalytic of La 1 x Sr xFeO 3 nanocrystal is the best at x=0.50,and to oxygen anode,x=0.75.The results also show that catalytic activity of nano level crystal is better than no nano level crystal which were prepared by conventional methods.