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AuthorLi, W.
AuthorWang, F.
AuthorLiu, Y.
AuthorWang, J.
AuthorYang, J.
AuthorZhang, L.
AuthorElzatahry, A.A.
AuthorAl-Dahyan, D.
AuthorXia, Y.
AuthorZhao, D.
Available date2022-05-22T09:12:26Z
Publication Date2015
Publication NameNano Letters
ResourceScopus
Identifierhttp://dx.doi.org/10.1021/acs.nanolett.5b00291
URIhttp://hdl.handle.net/10576/31380
AbstractUniform oxide deposition on graphene to form a sandwich-like configuration is a well-known challenge mainly due to their large lattice mismatches and poor affinities. Herein, we report a general strategy to synthesize uniform mesoporous TiO2/graphene/mesoporous TiO2 sandwich-like nanosheets (denoted as G@mTiO2), which cannot be achieved by conventional one-pot synthetic methods. We show that by rational control of hydrolysis and condensation of Ti precursors in a slow way, GO sheets can be conformably coated by amorphous TiO2 shells, which then can be facilely transformed into the well-defined G@mTiO2 nanosheets by annealing. This amorphous-to-crystalline strategy conveniently allows bypassing strain fields that would inevitably arise if direct growth of mesoporous anatase shells on graphene. As distinct from the most common structures of graphene-based composites (mixed, wrapped, or anchored models), the resultant materials display a uniform sandwich-like configuration: few-layer graphene conformably encapsulated by mesoporous TiO2 shells. This new G@mTiO2 nanosheet exhibits ultrathin nature (?34 nm), small size and high crystalline nanocrystals (?6 nm), high surface areas (?252 m2/g) and uniform mesopores (?3.4 nm). We further show that the thickness of mesoporous TiO2 shells can be facilely adjusted as desired by controlling the ammonia content, and this facile strategy can be easily extended to design other oxide/graphene/oxide sandwich-like materials. More importantly, we showcase the benefits of the resultant G@mTiO2 nanosheets as anodes in lithium ion batteries: they deliver an extra high capacity, an excellent high-rate capability, and long cycle life. 2015 American Chemical Society.
Languageen
PublisherAmerican Chemical Society
SubjectCoatings
Crystalline materials
Graphene
Lattice mismatch
Lithium
Lithium alloys
Lithium batteries
Lithium compounds
Lithium-ion batteries
Nanosheets
Shells (structures)
Titanium dioxide
Few-layer graphene
Graphene-based composites
High rate capability
Hydrolysis and condensation
Large lattice mismatch
Mesoporous anatase
Mesoporous TiO
sandwich-like sheets
Mesoporous materials
TitleGeneral strategy to synthesize uniform mesoporous TiO2/Graphene/Mesoporous TiO2 sandwich-like nanosheets for highly reversible lithium storage
TypeArticle
Pagination2186-2193
Issue Number3
Volume Number15
dc.accessType Abstract Only


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