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Electrochemical Energy Storage Applications of CVD Grown Niobium Oxide Thin Films

AuthorsFiz, Raquel; Appel, Linus; Gutiérrez-Pardo, A.; Ramírez-Rico, J.; Mathur, S.
Issue Date2016
PublisherAmerican Chemical Society
CitationACS Applied Materials and Interfaces 8: 21423- 21430 (2016)
AbstractWe report here on the controlled synthesis, characterization, and electrochemical properties of different polymorphs of niobium pentoxide grown by CVD of new single-source precursors. NbO films deposited at different temperatures showed systematic phase evolution from low-temperature tetragonal (TT-NbO, T-NbO) to high temperature monoclinic modifications (H-NbO). Optimization of the precursor flux and substrate temperature enabled phase-selective growth of NbO nanorods and films on conductive mesoporous biomorphic carbon matrices (BioC). NbO thin films deposited on monolithic BioC scaffolds produced composite materials integrating the high surface area and conductivity of the carbonaceous matrix with the intrinsically high capacitance of nanostructured niobium oxide. Heterojunctions in NbO/BioC composites were found to be beneficial in electrochemical capacitance. Electrochemical characterization of NbO/BioC composites showed that small amounts of NbO (as low as 5%) in conjunction with BioCarbon resulted in a 7-fold increase in the electrode capacitance, from 15 to 104 F g, while imparting good cycling stability, making these materials ideally suited for electrochemical energy storage applications.
Identifiersdoi: 10.1021/acsami.6b03945
issn: 1944-8252
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