期刊
WASTE AND BIOMASS VALORIZATION
卷 5, 期 2, 页码 305-313出版社
SPRINGER
DOI: 10.1007/s12649-013-9257-4
关键词
Wood residues; Energy storage; Supercapacitors; Activated carbons; Biocarbons; Eucalyptus grandis wood
资金
- Spanish AECID
- Uruguayan ANII
- Spanish MINECO
- [MAT 2011-25198]
- [ANII PR_FSE_2009_1_09]
Wood residues are ordinary wastes in the forestry industry and their valorization is an important issue. Eucalyptus grandis wood dust was chosen as a model wood residue and biocarbons (BCs) and activated BCs were prepared from it and studied as active materials for supercapacitor electrodes. Several ordinary activation methods were used and microporous activated BCs with specific surface areas up to 900 m(2) g(-1), and different content of oxygenated surface groups were obtained. The preparation or activation temperature is the parameter that mainly affects the electrical conductivity. For temperatures above 700 degrees C, the samples reach an electrical conductivity as high as 1 S cm(-1). The specific capacitance of the activated BCs reaches values up to 203 F g(-1) in acidic electrolyte. The highest specific capacitance is obtained when chemical activation with ZnCl2 at 900 degrees C followed by chemical oxidation with nitric acid is used. BCs activated with ZnCl2 at 900 degrees C and CO2 at 800 degrees C displayed good rate capability and the maximum power density. Activation with ZnCl2 at 900 degrees C also leads to BCs with the maximum energy density. These results show that E. grandis wood dust is a promising low cost and environmental friendly precursor for biocarbon electrodes.
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