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Figure 7
XANES spectra of (a) the C K-edge of graphene (N-rmGO) and Co3O4-coated graphene (Co3O4/N-rmGO), and at the O K-edge of Co3O4 and Co3O4-coated graphene (inset); (b) the Co L-edge of Co3O4 and Co3O4-coated graphene. The chemical bonding between Co3O4 and graphene in Co3O4-coated graphene has been demonstrated by the spectroscopic difference between free-standing Co3O4 (and graphene) and the hybrid (Co3O4-coated graphene). The enhanced 288 eV peak at the C K-edge in the hybrid highlights the possibility of a C—O—Co bond in the hybrid (Liang et al., 2011BB11).

IUCrJ
Volume 1| Part 6| October 2014| Pages 604-613
ISSN: 2052-2525
doi:10.1107/S2052252514021368