Do the bridging oxygen bonds between active Sn nanodots and graphene improve the Li-storage properties?

Three‐Dimensional Porous CoFe2O4/Graphene Composite for Highly Stable Sodium‐Ion Batteries

“…The CoFeÀ glycerate precursor could be used as a selftemplate [28,29] and nanoporous CoFe 2 O 4 hollow spheres were obtained upon a subsequent annealing (350°C for 2 h, N 2 flow). [31][32][33] Besides, the whole preparation is simple, low cost and easy for scale up. In the second hydrothermal step, the resultant nanoporous CoFe 2 O 4 hollow spheres were well anchored onto 3D nitrogen-doped graphene networks aided by electrostatic attraction due to the opposite charge nature of GO solution and CoFe 2 O 4 (GO solution is negative-charge nature [30] and CoFe 2 O 4 is positive-charged by EDA [31] ).…”

Sulfur‐Doped Carbon‐Wrapped Heterogeneous Fe3O4/Fe7S8/C Nanoplates as Stable Anode for Lithium‐Ion Batteries

“…The high resolution XPS spectrum of O 1s (Figure c) contains the peaks of Fe−O (530.1 eV) and O−S (530.9 eV). The existence of O−S bond indicates that there is a chemical bond interaction between Fe 3 O 4 and Fe 7 S 8 in Fe 3 O 4 /Fe 7 S 8 /C composite, which is beneficial to the structural stability of Fe 7 S 8 during charge and discharge . In the XPS spectrum of O 1s, the peak with a binding energy of 531.9 eV corresponds to −CO, and the other peak at 533.5 eV corresponds to ‐CO 2 .…”

“…indicates that there is a chemical bond interaction between Fe 3 O 4 and Fe 7 S 8 in Fe 3 O 4 /Fe 7 S 8 /C composite, which is beneficial to the structural stability of Fe 7 S 8 during charge and discharge. [27][28] In the XPS spectrum of O 1s, the peak with a binding energy of 531.9 eV corresponds to À CO, and the other peak at 533.5 eV corresponds to -CO 2 . In the high resolution XPS spectrum of C 1s (Figure 2d), the peaks at 284.9, 285.6 and 289.2 eV correspond to CÀ C, CÀ S and CÀ O, respectively.…”

Mn0.5Co2.5O4 Nanofibers Intercalated into Graphene Frameworks with Mesoporous Structure for Batteries and Supercapacitors

“…Thep ositively charged metal ions (Mn 2 + and Co 2 + )w ere easily assembled with oxygen-riche thylene glycol through electrostatic interactions,a nd then formed aligned manganese cobalt oxide nanofibers.F urthermore,s trong coordination between metal ions in the metal acetate and the functional groups (e.g., ÀCOOH, ÀOH) on the GO surfaces can make the nanofiber easy to nucleate on the surface of the GO layer, and fasten the GO layer with nanofibersi nto ad ensely packeds tructure. [30,31] As ar esult, the MnÀCo precursor nanofiber was generated on ag raphene layer, and GO was reduced to form reducedg raphene oxide (rGO) during hydrothermal treatment (donated as the MnCo@rGO precursor). In the second step,t he MnCo@rGOp recursorw as converted into the Mn 0.5 Co 2.5 O 4 @G composite with complete morphology retention during al ow-temperature heat treatment (200 8C) in air.…”