Ultrathin TiO2(B) Nanorods with Superior Lithium-Ion Storage Performance

作者：Giannuzzi Roberto; Manca Michele^*; De Marco Luisa; Belviso Maria R; Cannavale Alessandro; Sibillano Teresa; Giannini Cinzia; Cozzoli P Davide; Gigli Giuseppe

来源：ACS Applied Materials & Interfaces, 2014, 6(3): 1933-1943.

DOI：10.1021/am4049833

• TiO2(B) nanorods
• mesostructured electrodes
• lithium-ion storage
• electrochemical-impedance spectroscopy

The peculiar architecture of a novel class of anisotropic TiO2(B) nanocrystals, which were synthesized by an surfactant-assisted nonaqueous sol-gel route, was profitably exploited to fabricate highly efficient mesoporous electrodes for Li storage. These electrodes are composed of a continuous spongy network of interconnected nanoscale units with a rod-shaped profile that terminates into one or two bulgelike or branch-shaped apexes spanning areas of about 5 x 10 nm(2). This architecture transcribes into a superior cycling performance (a charge capacitance of 222 mAh g(-1) was achieved by a carbon-free TiO2(B)-nanorods-based electrode vs 110 mAh g(-1) exhibited by a comparable TiO2-anatase electrode) and good chemical stability (more than 90% of the initial capacity remains after 100 charging/discharging cycles). Their outstanding lithiation/delithiation capabilities were also exploited to fabricate electrochromic devices that revealed an excellent coloration efficiency (130 cm(2) C-1 at 800 nm) upon the application of 1.5 V as well as an extremely fast electrochromic switching (coloration time similar to 5 s).

• 出版日期2014-2-12