Cation-anion dual-vacancy engineered two-dimensional atomically-thin nanosheets boosting the Na+ storage in TiO2
Cation-anion dual-vacancy engineered two-dimensional atomically-thin nanosheets boosting the Na+ storage in TiO2
研究概述
在原子级薄锐钛矿TiO2中同时引入钛空位和氧空位，用于钠离子储能。氧空位改善导电与离子扩散，钛空位增加储钠位点并降低势垒；0.1 A/g下容量298 mAh/g，1 A/g循环1200次后容量267 mAh/g。
谱图与表征信息
Fig. 3. Electronic structure and coordinated environment analysis of titanium oxide nanosheets with and without oxygen vacancies. (a) XANES spectra and (b) EXAFS in R-space of TiO2-500 and TiO2-Air. (c) EXAFS fitting curves of TiO2-500. The Ti K-edge WT-EXAFS contour plots for (d) Ti foil, (e) TiO2 and (f) TiO2-500. PDOS of (g) intrinsic anatase TiO2 (101) and (h) anatase TiO2 (101) with VTi and VO. (i) Charge densities of anatase TiO2 (101) with VTi and VO. The yellow/blue color denotes electron depletion/accumulation. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)