Structure modulated amorphous/crystalline WO3 nanoporous arrays with superior electrochromic energy storage performance

被引:71
作者
Shi, Yingdi [1 ,2 ]
Sun, Mingjun [1 ,2 ]
Zhang, Yong [1 ,2 ]
Cui, Jiewu [1 ,2 ]
Wang, Yan [1 ,2 ]
Shu, Xia [1 ,2 ]
Qin, Yongqiang [1 ,2 ]
Tan, Hark Hoe [3 ]
Liu, Jiaqin [1 ,4 ]
Wu, Yucheng [1 ,2 ]
机构
[1] Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Peoples R China
[2] Key Lab Adv Funct Mat & Devices Anhui Prov, Hefei 230009, Peoples R China
[3] Australian Natl Univ, Res Sch Phys & Engn, Dept Elect Mat Engn, Canberra, ACT 2601, Australia
[4] Hefei Univ Technol, Inst Ind & Equipment Technol, 193 Tunxi Rd, Hefei 230009, Anhui, Peoples R China
基金
中国国家自然科学基金;
关键词
Hybrid nanoarrays; Crystalline; Amorphous; Electrochromism; Capacitance; TUNGSTEN-OXIDE FILMS; SMART WINDOWS; THIN-FILMS; NANOROD ARRAYS; CRYSTALLINE; MORPHOLOGY; DEVICES; GROWTH; NANOSTRUCTURES; MECHANISM;
D O I
10.1016/j.solmat.2020.110579
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
In this work, porous bilayer hybrid WO3 nanoarray devices are constructed in which the active materials are composed of a crystalline WO3 nanobowl arrays layer modified by a nanoholey amorphous WO3 layer. The hybrid nanoarrays exhibit outstanding electrochromic performance with high color contrast in both visible and near infrared regions (93.9% at 633 nm, 89.6% at 1500 nm), fast response speed (3.0 s for coloring and 3.6 s for bleaching), exceptional cycling stability (95.4% contrast retention after 10,000 cycles) and decent coloring efficiency (92.3 cm(2)C(-1)) at low colored/bleached potentials (-1.0/1.0 V). In addition, the hybrid nanoarrays display high areal capacitance (47.4 mF/cm(2)), superior rate capability and cyclic stability (areal capacitance remains 84.0% after 2000 cycles). An electrochromic supercapacitor nanodevice is constructed based on the excellent electrochromic and capacitive performance of the hybrid nanoarrays. The enhanced electrochemical properties can be ascribed to the synergistic effect between the unique top amorphous layer structure and the underlying crystalline WO3 layer. In addition, oxygen partial pressure plays a crucial role in modulating the microstructure of the amorphous layer as well as electrochemical performance of the nanodevice. The obtained hybrid WO3 nanoarrays as well as the structure modulation promise great potential in developing high quality smart energy-efficient devices.
引用
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页数:10
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