Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 29, Pages 15225-15234Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta03217b
Keywords
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Funding
- National Natural Science Foundation of China [21201065, 51372091, 21371061, 21401057]
- Key Program of Science Technology Innovation Foundation of Universities [cxzd1113]
- Science and Technology Plan Projects of Guangdong Province [2012B010200030]
- Natural Science Foundation of Guangdong Province, China [S2013030012842, S2012040007836]
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In this work, we demonstrate for the first time that three-dimensional honeycomb-like hierarchically structured carbon (HSC) can be prepared by using high-ash-content sewage sludge as a carbon precursor. The fly-silicon process plays a crucial role in the formation of honeycomb-like hierarchical structures. The as-resulted HSC exhibits novel honeycomb-like frameworks, high specific surface area (2839 m(2) g(-1)), large pore volume (2.65 cm(3) g(-1)), interconnected hierarchical porosity, and excellent electrochemical performance. The high specific capacitance of 379 F g(-1) as well as excellent rate capability and outstanding cycling stability (over 90% capacitance retention after 20 000 cycles even at a high current density of 20 A g(-1)), makes it suitable for high-performance supercapacitor electrode materials. The assembled HSC// HSC symmetric supercapacitor presents enhanced supercapacitive behavior with a high energy density of 30.5 W h kg(-1) in aqueous solution. This strategy provides an effective method to develop high-performance electrode materials derived from other high-ash-content biomass wastes for supercapacitors.
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