Anodic hybridization of fluorinated layered perovskite nanosheet with polyaniline for electrochemical capacitor
Anodic hybridization of fluorinated layered perovskite nanosheet with polyaniline for electrochemical capacitor
复制标题
DOI：
10.1016/j.colsurfa.2014.07.001
复制
发表时间：
2014-10
期刊：
影响因子：
--
通讯作者：
T. Takei;Nanae Muraki;N. Xu;A. Miura;N. Kumada
中科院分区：
文献类型：
--
作者：
T. Takei;Nanae Muraki;N. Xu;A. Miura;N. Kumada
用聚四氟乙烯（PTFE）氟化层状钙钛矿，然后剥离，制备氟化钙钛矿纳米片溶液。在950°C和1100°C的固相反应条件下，制备了dionjacobson型层状钙钛矿rblanb2o7和KCa2Nb3O10。用聚四氟乙烯在400℃下氟化钙钛矿，其颜色由白色变为灰色或黑色，电导率提高到10−4 ~ 10−5S/m。首先用四丁基氢氧化铵（TBAOH）在水中插入各氟层状钙钛矿中的四丁基铵离子（TBA+），然后在乙腈溶液中剥离并电沉积。将苯胺作为单体加入到溶液中，在乙腈溶液中进行电沉积，形成杂化膜。x射线衍射图证实了聚苯胺分子可以嵌入到层间空间中。尽管进行了氟化处理，rblanb2o7和KCa2Nb3O10样品的聚苯胺在层间空间的体积填充分数分别为0.4和0.2左右。由于氟化作用，沉积的杂化膜的电化学比电容从低于50 F/g急剧增加到230 ~ 250 F/g以上。
A layered perovskite was fluorinated by polytetrafluoroethylene (PTFE) and then exfoliated to prepare a solution of fluorinated-perovskite nanosheets. Dion–Jacobson-type layered perovskites, RbLaNb2O7and KCa2Nb3O10, were prepared in solid-state reactions at 950 and 1100 °C, respectively. The perovskites were fluorinated using PTFE at 400 °C, upon which their color changed from white to gray or black and their electrical conductivity increased to the order of 10−4–10−5S/m. The tetrabutyl ammonium cations (TBA+) in each fluorinated layered perovskite were first intercalated by tetrabutylammonium hydroxide (TBAOH) in H2O and then exfoliated in an acetonitrile solution for electrodeposition. Aniline was added to the solution as a monomer and electrodeposition was carried out in the acetonitrile solution for formation of a hybrid film. X-ray diffraction patterns confirmed that the polyaniline molecules could be intercalated within the interlayer space. Despite the fluorination, the volumetric filling fractions of polyaniline in the interlayer space were around 0.4 and 0.2 for the respective samples from RbLaNb2O7and KCa2Nb3O10. The electrochemical specific capacitances of the deposited hybrid films increased steeply from below 50 F/g to above 230–250 F/g owing to the fluorination.