Abstract：
:Anatase TiO2 has been suggested as a potential sodium anode material, but the low electrical conductivity of TiO2 often limits the rate capability, resulting in poor electrochemical properties. To address this limitation, we propose graphene-wrapped anatase TiO2 nanofibers (rGO@TiO2 NFs) through an effective wrapping of reduced graphene oxide (rGO) sheets on electrospun TiO2 NFs. To provide strong electrostatic interaction between the graphene oxide (GO) sheets and the TiO2 NFs, poly(allylamine hydrochloride) (PAH) was used to induce a positively charged TiO2 surface by the immobilization of the -NH3(+) group and to promote bonding with the negatively charged carboxylic acid (-COO(-)) and hydroxyl (-O(-)) groups on the GO. A sodium anode electrode using rGO@TiO2 NFs exhibited a significantly improved initial capacity of 217 mAh g(-1), high capacity retention (85% after 200 cycles at 0.2C), and a high average Coulombic efficiency (99.7% from the second cycle to the 200th cycle), even at a 5C rate, compared to those of pristine TiO2 NFs. The improved electrochemical performances stem from highly conductive properties of the reduced GO which is effectively anchored to the TiO2 NFs.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Yeo Y,Jung JW,Park K,Kim IDdoi
10.1038/srep13862subject
Has Abstractpub_date
2015-09-10 00:00:00pages
13862issn
2045-2322pii
srep13862journal_volume
5pub_type
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