Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 45, Pages 30890-30898Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b09361
Keywords
biomorphic carbons; manganese oxide; nanostructured materials; supercapacitors; binder-free
Funding
- Junta de Andalucia [PE2012-TEP862]
- Spanish Ministerio de Economia y Competitividad [MAT2013-41233-R]
- Junta de Andalucia
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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 MnO, nanosheets 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 MnO, nanosheets with a layered nanocrystalline structure is obtained. The tuning of the MnO2 content and crystallite size via the concentration of KMnO4 used as impregnation solution allows to obtain composites that exhibit enhanced electrochemical behavior, achieving a capacitance of 592 F g(-1) in electrodes containing 3 wt % MnO2 with an excellent cyclic stability. The electrode materials were characterized before and after electrochemical testing.
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