期刊
CHEMELECTROCHEM
卷 4, 期 5, 页码 1016-1025出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201600848
关键词
carbon monoliths; electrical double-layer capacitance; microporosity; sulfuric acid electrolyte; supercapacitors
资金
- GV/FEDER [PROMETEOII/2014/010]
- University of Alicante [VIGROB-136]
- MINECO
- [MAT2014-57687-R]
Carbon monoliths are prepared by combining two carbon phases. A major phase is activated anthracite, which provides microporosity and a large surface area. The other phase is a carbonized polymer that provides self-consistency and contributes to densifying the monolith. Different degrees of anthracite activation and different contents of the two phases are investigated. These all-carbon monoliths have surface areas up to 2600 m(2)g(-1), mechanical strengths up to 6 MPa, electrical conductivities up to 2-4 S cm(-1), and densities between 0.4 and 0.7 gcm(-3). In sulfuric acid electrolyte, gravimetric capacitances up to 307 Fg(-1) are achieved. The double-layer capacitances due to the hydronium and bisulfate ions are separately measured, the former being approximately 25% higher than the latter. The size of the two ions electro-adsorbed at the double layer is discussed. The pseudocapacitance associated with the hydronium ion is 10-25% of the total capacitance of this ion. All of the carbon monoliths show high capacitance retention with current density; the retention of the double-layer capacitance is similar for the two types of ions and higher than the retention of the pseudocapacitance associated with the hydronium ion.
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