TY - GEN
T1 - Heterogeneous manganese oxide-encased carbon nanocomposite fibers for high performance pseudocapacitors
AU - Li, Qiang
AU - Lozano, Karen
AU - Lü, Yinong
AU - Mao, Yuanbing
PY - 2014
Y1 - 2014
N2 - The integration of transition metal oxide nanocrystals and one-dimensional (1D) conducting carbon structures to generate their hybrids can create unpredictable new physical and chemical properties in comparison with single phase components. Here we report the fabrication of heterogeneous MnO nanocrystal (NC)-encased hierarchical carbon nanocomposite fibers (MCNFs) via a novel and large-scale Forcespinning followed by low temperature carbonization. Manganese nitrate containing polyvinylpyrrolidone (PVP) polymeric fiber was carbonized at relatively low temperature, i.e. 500°C due to oxidant Mn 2+ cations. Different inward and outward ionic diffusion rates of Mn2+ cations concurrently result in congregating MnO NCs near the surface region of the nanocomposites during thermolysis. After anodic and cyclic voltammetric electrochemical oxidations, in situ phase transformation from electrochemically inactive MnO NCs to pseudocapacitive MnOx counterparts occurs, which yields a MnOx NC/carbon hybrid fiber network with MnOx NC-enriched functional surface. These NCs are accessible to aqueous electrolyte ions for Faradic redox reactions. Therefore these unique nanocomposites demonstrate a promising potential as pseudocapacitive electrode materials.
AB - The integration of transition metal oxide nanocrystals and one-dimensional (1D) conducting carbon structures to generate their hybrids can create unpredictable new physical and chemical properties in comparison with single phase components. Here we report the fabrication of heterogeneous MnO nanocrystal (NC)-encased hierarchical carbon nanocomposite fibers (MCNFs) via a novel and large-scale Forcespinning followed by low temperature carbonization. Manganese nitrate containing polyvinylpyrrolidone (PVP) polymeric fiber was carbonized at relatively low temperature, i.e. 500°C due to oxidant Mn 2+ cations. Different inward and outward ionic diffusion rates of Mn2+ cations concurrently result in congregating MnO NCs near the surface region of the nanocomposites during thermolysis. After anodic and cyclic voltammetric electrochemical oxidations, in situ phase transformation from electrochemically inactive MnO NCs to pseudocapacitive MnOx counterparts occurs, which yields a MnOx NC/carbon hybrid fiber network with MnOx NC-enriched functional surface. These NCs are accessible to aqueous electrolyte ions for Faradic redox reactions. Therefore these unique nanocomposites demonstrate a promising potential as pseudocapacitive electrode materials.
UR - http://www.scopus.com/inward/record.url?scp=84891371178&partnerID=8YFLogxK
M3 - 会议稿件
AN - SCOPUS:84891371178
SN - 9781118807583
T3 - Ceramic Engineering and Science Proceedings
SP - 41
EP - 55
BT - Ceramic Materials for Energy Applications III - A Collection of Papers Presented at the 37th International Conference on Advanced Ceramics and Composites, ICACC 2013
T2 - Ceramic Materials for Energy Applications III - 37th International Conference on Advanced Ceramics and Composites, ICACC 2013
Y2 - 27 January 2013 through 1 February 2013
ER -