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Adjacent Fe-Vacancy Interactions as the Origin of Room Temperature Ferromagnetism in (InFe)O
R. J. Green, T. Z. Regier, B. Leedahl +5
Dilute magnetic semiconductors (DMSs) show great promise for applications in spin-based electronics, but in most cases continue to elude explanations of their magnetic behavior. He…
Nitrogen-Functionalized Graphene Nanoflakes (GNFs:N): Tunable Photoluminescence and Electronic Structures
J. W. Chiou, Sekhar C. Ray, S. I. Peng +22
This study investigates the strong photoluminescence (PL) and X-ray excited optical luminescence observed in nitrogen-functionalized 2D graphene nanoflakes (GNFs:N), which arise fr…
Covalent Hybrid of Spinel Manganese-Cobalt Oxide and Gra-phene as Advanced Oxygen Reduction Electrocatalysts
Yongye Liang, Hailiang Wang, Jigang Zhou +4
Through direct nanoparticle nucleation and growth on nitrogen doped, reduced graphene oxide sheets and cation substitution of spinel Co3O4 nanoparticles, a manganese-cobalt spinel…
Utility of the inverse partial fluorescence for electronic structure studies of battery materials
H. Wadati, A. J. Achkar, D. G. Hawthorn +7
X-ray absorption spectroscopy (XAS) is one of the most widely used experimental techniques to study the electronic and spatial structure of materials. Fluorescence yield mode is bu…
Co3O4 Nanocrystals on Graphene as a Synergistic Catalyst for Oxygen Reduction Reaction
Yongye Liang, Yanguang Li, Hailiang Wang +4
Catalysts for oxygen reduction and evolution reactions are at the heart of key renewable energy technologies including fuel cells and water splitting. Despite tremendous efforts, d…
Valence evaluation of LiMnO2 and related battery materials by x-ray absorption spectroscopy
H. Wadati, D. G. Hawthorn, T. Z. Regier +5
We present an x-ray absorption study of the oxidation states of transition-metal-ions of LiMnO2 and its related materials, widely used as cathodes in Li-ion batteries. The comparis…