Kim, Ki-Tae Ali, Ghulam Chung, Kung Yoon Yoon, Chong Seung Yashiro, Hitoshi Sun, Yang-Kook Lu, Jun Amine, Khalil Myung, Seung-Taek 2024-01-20T10:32:42Z 2024-01-20T10:32:42Z 2021-09-05 2014-02 1530-6984 https://pubs.kist.re.kr/handle/201004/127173 For the first time, we report the electrochemical activity of anatase TiO2 nanorods in a Na cell. The anatase TiO2 nanorods were synthesized by a hydrothermal method, and their surfaces were coated by carbon to improve the electric conductivity through carbonization of pitch at 700 degrees C for 2 h in Ar flow. The resulting structure does not change before and after the carbon coating, as confirmed by X-ray diffraction (XRD). Transmission electron microscopic images confirm the presence of a carbon coating on the anatase TiO2 nanorods. In cell tests, anodes of bare and carbon-coated anatase TiO2 nanorods exhibit stable cycling performance and attain a capacity of about 172 and 193 mAh g(-1) on the first charge; respectively, in the voltage range of 3-0 V. With the help of the conductive carbon layers, the carbon-coated anatase TiO2 delivers more capacity at high rates, 104 mAh g(-1) at the 10 C-rate (3.3 A g(-1)), 82 mAh g(-1) at the 30 C-rate (10 A g(-1)), and 53 mAh g(-1) at the 100 C-rate (33 A g(-1)). By contrast, the anode of bare anatase TiO2 nanorods delivers only about 38 mAh g(-1) at the 10 C-rate (3.3 A g(-1)). The excellent cyclability and high-rate capability are the result of a Na+ insertion and extraction reaction into the host structure coupled with Ti4+/3+ redox reaction, as revealed by X-ray absorption spectroscopy. English AMER CHEMICAL SOC NANOSTRUCTURED TIO2 ION INTERCALATION RUTILE TIN NANOCOMPOSITES LI Anatase Titania Nanorods as an Intercalation Anode Material for Rechargeable Sodium Batteries Article 10.1021/nl402747x 1 NANO LETTERS, v.14, no.2, pp.416 - 422 NANO LETTERS 14 2 416 422 scie scopus 000331343900004 2-s2.0-84894216143 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article NANOSTRUCTURED TIO2 ION INTERCALATION RUTILE TIN NANOCOMPOSITES LI Natase TiO2 nanorods carbon coating intercalation anode sodium battery