Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 19, Pages 17416-17424Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b02123
Keywords
pseudocapacitive; high rate performance; first-principles calculations; surface defects; sodium-ion battery
Funding
- Major Projects of Shanxi Province [MC2015-04]
- Youth Foundation of Shanxi Province [201701D221070]
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Ti-O-C channels for ultrafast sodium storage were constructed in N/S-co-doped TiO2-C nanofibers, which deliver a high rate performance of 181.9 mAh g(-1) at 5 A g(-1) after 3000 cycles. The existence of Ti-O-C bonds at the interface of TiO2-C phases was revealed by synchrotron radiation X-ray absorption spectra. Based on this, first-principles calculations further verified the low energy barrier for Na+ insertion/extraction in the Ti-O-C channels formed by the intimately integrated graphite layer with TiO2 near the surface. In addition, surface defects induced by heteroatoms accelerate the Na+ mass transfer through the pathway from the carbon surface to the Ti-O-C channel.
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