title: Manganese Dioxide Supported on Porous Biomorphic Carbons as Hybrid Materials for Energy Storage Devices.
abstract: A facile and low-cost method has been employed to fabricate MnO2/C hybrid materials for use as binder-free electrodes for supercapacitor applications. Biocarbon monoliths were obtained through pyrolysis of beech wood, replicating the microstructure of the cellulosic precursor, and serve as 3D porous and conductive scaffolds for the direct growth of MnO2nanosheets by a solution method. Evaluation of the experimental results indicates that a homogeneous and uniform composite material made of a carbon matrix exhibiting ordered hierarchical porosity and MnO2nanosheets with a layered nanocrystalline structure is obtained. The tuning of the MnO2content and crystallite size via the concentration of KMnO4used as impregnation solution allows to obtain composites that exhibit enhanced electrochemical behavior, achieving a capacitance of 592 F g-1in electrodes containing 3 wt % MnO2with an excellent cyclic stability. The electrode materials were characterized before and after electrochemical testing.
authors: Departamento Física de la Materia Condensada, ICMS (Universidad de Sevilla-CSIC) , Avenida Reina Mercedes S/N, 41012 Seville, Spain.|Instituto de Ciencia de Materiales de Sevilla (CSIC-Universidad de Sevilla) , Avenida Américo Vespucio 49, 41092 Seville, Spain.
authors: Antonio
authors: A
authors: Gutierrez-Pardo
authors: Instituto de Ciencia de Materiales de Sevilla (CSIC-Universidad de Sevilla) , Avenida Américo Vespucio 49, 41092 Seville, Spain.
authors: Bertrand
authors: B
authors: Lacroix
authors: Departamento Física de la Materia Condensada, ICMS (Universidad de Sevilla-CSIC) , Avenida Reina Mercedes S/N, 41012 Seville, Spain.|Instituto de Ciencia de Materiales de Sevilla (CSIC-Universidad de Sevilla) , Avenida Américo Vespucio 49, 41092 Seville, Spain.
authors: Julian
authors: J
authors: Martinez-Fernandez
authors: Departamento Física de la Materia Condensada, ICMS (Universidad de Sevilla-CSIC) , Avenida Reina Mercedes S/N, 41012 Seville, Spain.|Instituto de Ciencia de Materiales de Sevilla (CSIC-Universidad de Sevilla) , Avenida Américo Vespucio 49, 41092 Seville, Spain.
authors: Joaquin
authors: J
authors: Ramirez-Rico
keywords: binder-free; biomorphic carbons; manganese oxide; nanostructured materials; supercapacitors