title: Improvements in the electrochemical kinetic properties and rate capability of anatase titanium dioxide nanoparticles by nitrogen doping.
abstract: Pure anatase TiO2 and N-doped TiO2 nanoparticles were prepared by a solvothermal method. X-ray photoelectron spectroscopy showed that the surface of the doped material was dominated by interstitial N, while interstitial and substitutional N coexisted in the material bulk. Both materials showed superior cycle stability. In addition, the N-doped material exhibited much better rate capability than pure TiO2. A discharge capacity of 45 mAh g(-1) was obtained at the 15 C rate, which was 80% higher than that of pure TiO2. The electrochemical kinetic properties of the materials were studied by a galvanostatic intermittent titration technique and electrochemical impedance spectroscopy. The charge-transfer resistance of TiO2 was decreased by N doping. Meanwhile, the minimum lithium diffusion coefficient was increased to 2.14 × 10(-11) cm(2) s(-1), which is 13 times higher than that of pure TiO2. This indicates that the electrochemical kinetic properties of TiO2 were improved by N doping, which substantially improved the specific capacity and rate capability of TiO2.
authors.affiliation: Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University , Changchun 130012, People's Republic of China.
authors.forename: Yongquan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Fei
authors.initials: F
authors.lastname: Du
authors.forename: Xiao
authors.initials: X
authors.lastname: Yan
authors.forename: Yuming
authors.initials: Y
authors.lastname: Jin
authors.forename: Kai
authors.initials: K
authors.lastname: Zhu
authors.forename: Xue
authors.initials: X
authors.lastname: Wang
authors.forename: Haoming
authors.initials: H
authors.lastname: Li
authors.forename: Gang
authors.initials: G
authors.lastname: Chen
authors.forename: Chunzhong
authors.initials: C
authors.lastname: Wang
authors.forename: Yingjin
authors.initials: Y
authors.lastname: Wei