Anatase Titania Nanorods as an Intercalation Anode Material for Rechargeable Sodium Batteries
- Title
- Anatase Titania Nanorods as an Intercalation Anode Material for Rechargeable Sodium Batteries
- Author
- 윤종승
- Keywords
- Natase TiO2; nanorods; carbon coating; intercalation; anode; sodium battery
- Issue Date
- 2014-02
- Publisher
- AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
- Citation
- NANO LETTERS, Vol.14 No.2 [2014], 416-422
- Abstract
- 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 °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.
- URI
- https://pubs.acs.org/doi/10.1021/nl402747xhttps://repository.hanyang.ac.kr/handle/20.500.11754/70722
- ISSN
- 1530-6984; 1530-6992
- DOI
- 10.1021/nl402747x
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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