In this work,hollow WO3/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 2 000 cycles)and decent coloring efficiency(116.2 cm2·C-1)at low colored/bleached potentials(-1.0/1.0 V).The hollow hybrid nanospheres also display high areal capacitance(54.6 mF/cm2),superior rate capability and cyclic stability(areal capacitance remains 79.6%after 2 000 cycles).
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