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16 September 2014 Acid-leached α-MnO2 nanowires for electrochemical energy storage
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We present synthesis, acid-leaching, characterization and electrochemistry of α-MnO2 nanowires with tunnel crystal structure. This material is used as a matrix for lithium ions intercalation to provide insights into the effects of postsynthesis treatment on charge storage properties. Hydrothermal treatment of precursors produced 20 - 200 nm thick and tens of microns long nanowires. Acid leaching was carried out in the concentrated nitric acid at room temperature and resulted in the change of material composition and surface area. Original α-MnO2 nanowires showed initial discharge specific capacity of 96 mAh/g, while acid-leached material exhibited higher capacity values. This work forms the basis for future study aimed at understanding of correlation between crystal structure, composition and morphology of the “host” matrix and nature of the “guest” ions for beyond lithium electrochemical energy storage. In addition, we demonstrate single nanowire electrochemical cells for the study of electrochemically-correlated mechanical properties of the nanowires.
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Bryan Byles, Arunkumar Subramanian, and Ekaterina Pomerantseva "Acid-leached α-MnO2 nanowires for electrochemical energy storage", Proc. SPIE 9174, Nanoepitaxy: Materials and Devices VI, 91740Z (16 September 2014);

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