非水溶剂中纳米结构SrTiO_(3)薄膜电极平带电位研究

Flatband Potentials for Nanostructured SrTiO_(3) Film Electrodes in Nonaqueous Solvents

本文制备了纳米结构SrTiO_(3)薄膜电极,并通过XRD、TEM和SEM对电极的结构和表面形貌进行表征。利用光谱电化学法,测定了纳米结构SrTiO_(3)电极在非水溶剂中的平带电位。研究发现:SrTiO_(3)电极在水中及非水质子溶剂(甲醇、乙醇)中的平带电位比在非水非质子溶剂(乙腈、四氢呋喃)中更正。在水及非水质子溶剂中,Li^(+)的添加对SrTiO_(3)电极的平带电位影响较小,而在非水非质子溶剂中,Li^(+)的加入对SrTiO_(3)电极的平带电位有较大影响,随着Li^(+)浓度的增加,SrTiO_(3)电极的平带电位向电位更正的方向移动。

Transparent nanostructured SrTiO_(3) film electrodes were prepared on conduction substrates and characterized by XRD,TEM and SEM.The flatband potential(Efb)of a nanostructured SrTiO_(3) electrode was determined with spectroelectrochemical measurement in a range of nonaqueous solvents(acetonitrile,tetrahydrofuran,methanol and ethanol).The results show that Efb is significantly more positive for water and nonaqueous protic solvents(methanol and ethanol)than for nonaqueous aprotic solvents(acetonitrile and tetrahydrofuran)due to establishment of a proton adsorption-desorption equilibrium.Further,addition of Li^(+)has no significant effect on Efb in water and nonaqueous protic solvents,but in nonaqueous aprotic solvents,the Efb shifts to more positive values following the increase of added Li^(+)concentration.