Phoretic Deposition of Graphene on Manganese-Cobalt Oxide Composites for Supercapacitor Electrodes

Gutierrez, Daniel H.; Lake, John R.; Javier, Cristina; Cheng, Arthur; Tanaka, Zuki; Londoño, Nicolas J.; Chen, Bin

doi:10.4028/www.scientific.net/ast.77.302

Cited by 1 publication

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“…The synthesis protocol is explained in detail in our previous works. 20 , 24 For GO, MnO 2 , and Co 3 O 4 nanomaterial synthesis, the procedures in refs ( 25 − 27 )were followed.…”

Section: Experimental Workmentioning

confidence: 99%

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X-ray Absorption Study of Graphene Oxide and Transition Metal Oxide Nanocomposites

et al. 2014

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The surface properties of the electrode materials play a crucial role in determining the performance and efficiency of energy storage devices. Graphene oxide and nanostructures of 3d transition metal oxides were synthesized for construction of electrodes in supercapacitors, and the electronic structure and oxidation states were probed using near-edge X-ray absorption fine structure. Understanding the chemistry of graphene oxide would provide valuable insight into its reactivity and properties as the graphene oxide transformation to reduced-graphene oxide is a key step in the synthesis of the electrode materials. Polarized behavior of the synchrotron X-rays and the angular dependency of the near-edge X-ray absorption fine structures (NEXAFS) have been utilized to study the orientation of the σ and π bonds of the graphene oxide and graphene oxide–metal oxide nanocomposites. The core-level transitions of individual metal oxides and that of the graphene oxide nanocomposite showed that the interaction of graphene oxide with the metal oxide nanostructures has not altered the electronic structure of either of them. As the restoration of the π network is important for good electrical conductivity, the C K edge NEXAFS spectra of reduced graphene oxide nanocomposites confirms the same through increased intensity of the sp2-derived unoccupied states π* band. A pronounced angular dependency of the reduced sample and the formation of excitonic peaks confirmed the formation of extended conjugated network.

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“…The synthesis protocol is explained in detail in our previous works. 20 , 24 For GO, MnO 2 , and Co 3 O 4 nanomaterial synthesis, the procedures in refs ( 25 − 27 )were followed.…”

Section: Experimental Workmentioning

confidence: 99%

“…Chemicals used for GO and metal oxide synthesis were purchased from Sigma-Aldrich; 18 MΩ-cm water was used for all experiments. The synthesis protocol is explained in detail in our previous works. , For GO, MnO 2 , and Co 3 O 4 nanomaterial synthesis, the procedures in refs − were followed.…”

Section: Experimental Workmentioning

confidence: 99%