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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemical engineering
Anatase titania nanorods as an intercalation anode material for rechargeable sodium batteries
Nano Letters, Volume 14, No. 2, Year 2014
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Description
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. © 2014 American Chemical Society.
Authors & Co-Authors
Kim, Ki Tae
South Korea, Seoul
Sejong University
Ali, Ghulam
South Korea, Seoul
Korea Institute of Science and Technology
Chung, Kyung-yoon
South Korea, Seoul
Korea Institute of Science and Technology
Yoon, Chong Seung
South Korea, Seoul
Hanyang University
Yashiro, Hitoshi
Japan, Morioka
Iwate University
Sun, Yang Kook
South Korea, Seoul
Hanyang University
Saudi Arabia, Jeddah
King Abdulaziz University
Lu, Jun
United States, Lemont
Argonne National Laboratory
Amine, Khalil M.
Saudi Arabia, Jeddah
King Abdulaziz University
United States, Lemont
Argonne National Laboratory
Myung, Seung-taek
South Korea, Seoul
Sejong University
Statistics
Citations: 403
Authors: 9
Affiliations: 6
Identifiers
Doi:
10.1021/nl402747x
ISSN:
15306984
e-ISSN:
15306992
Research Areas
Environmental