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Carbon dots supported upon N-doped TiO2 nanorods applied into sodium and lithium ion batteries.
- Source :
- Journal of Materials Chemistry A; 2015, Vol. 3 Issue 10, p5648-5655, 8p
- Publication Year :
- 2015
-
Abstract
- N-doped TiO<subscript>2</subscript> nanorods decorated with carbon dots with enhanced electrical-conductivity and faster charge-transfer have been fabricated utilizing a simple hydrothermal reaction process involving TiO<subscript>2</subscript> powders (P25) and NaOH in the presence of carbon dots followed by ion exchange and calcination treatments. Due to the merits of the carbon dots, doping and nanostructures, the as-designed N–TiO<subscript>2</subscript>/C-dots composite utilized as anode materials for lithium-ion batteries can sustain a capacity of 185 mA h g<superscript>−1</superscript> with 91.6% retention even at a high rate of 10 C over 1000 cycles. It is interesting to note that the ratios of capacitive charge capacity during such high rates for the N–TiO<subscript>2</subscript>/C-dots composite electrodes are higher than those at low rates, which likely explains the observed excellent rate capabilities. In contrast to lithium-ion batteries, sodium-ion batteries have gained more interest in energy storage grids because of the greater abundance and lower cost of sodium-containing precursors. The as-obtained N–TiO<subscript>2</subscript>/C-dots composites reported here and utilized as anode materials for sodium-ion batteries exhibit excellent electrochemical performances, including substantial cycling stabilities (the capacity retention ratios after 300 cycles at 5 C is 93.6%) and remarkable rate capabilities (176 mA h g<superscript>−1</superscript> at 5 C, 131 mA h g<superscript>−1</superscript> at 20 C); such performances are the greatest ever reported to date over other structured TiO<subscript>2</subscript> or TiO<subscript>2</subscript> composite materials. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507488
- Volume :
- 3
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 101195670
- Full Text :
- https://doi.org/10.1039/c4ta05611f