WO_(3)/PEDOT双层复合空心纳米球阵列的设计生长与电致变色/储能双功能特性

Designed growth of hollow WO_(3)/PEDOT bilayer hybrid nanosphere arrays film with superior electrochromic and capacitive performance

本文采用模板辅助磁控溅射和电化学沉积技术,构建了WO_(3)/聚(3,4-乙烯二氧噻吩)(PEDOT)双层复合空心纳米球阵列。独特的空心纳米阵列结构可以提供与电解液较大的接触面积,有利于电极与电解液之间的离子传输,所制备的WO3层属于对小离子具有大容量的非晶相,提供了大量的离子结合位点,PEDOT层则形成了一个独特的导电网络,可以有效地促进电子传递并连接原本分离的色心。所制备的空心纳米球复合薄膜在可见光波段具有较高光学调制能力(633 nm处77.4%),较快的响应速度(着色3.2 s,褪色4.2 s),良好的循环稳定性(2000次循环后失去14.5%的光调制幅度),在低电位下-1.0/1.0 V下具有良好的着色效率(116.2 cm^(2)·C^(-1)),所获得的有机无机复合材料还具有较高的面电容(54.6 mF/cm^(2))、出色的倍率性能和循环稳定性(经历2000次循环后的面积电容仍保持为原来的79.6%)。

In this work,hollow WO_(3)/poly(3,4-ethylenedioxythiophene)(PEDOT)bilayer hybrid nanosphere arrays film was constructed by template-assisted magnetron sputtering combined with electrochemical deposition.The hollow nanosphere arrays could provide large contact area with electrolyte to benefit ion exchange.The prepared WO3 layer was responsible for offering a lot of ions binding sites due to the large capacity of amorphous WO3 for small ions,and the PEDOT layer was prepared to construct a unique conductive network which could effectively facilitate electron transportation and connect separated color centers.The obtained hollow hybrid nanosphere film exhibits outstanding electrochromic performance with high contrast(77.4%at 633 nm),fast response speed(3.2 s for coloring and 4.2 s for bleaching),good cycling stability(lose 14.5%optical modulation after 2000 cycles)and decent coloring efficiency(116.2 cm^(2)·C^(-1))at low colored/bleached potentials(−1.0/1.0 V).The hollow hybrid nanospheres also display high areal capacitance(54.6 mF/cm^(2)),superior rate capability and cyclic stability(areal capacitance remains 79.6%after 2000 cycles).