Journal
ROYAL SOCIETY OPEN SCIENCE
Volume 5, Issue 4, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rsos.172456
Keywords
digested sludge; supercapacitor; three-dimensional hierarchical porous carbon; energy storage
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Funding
- National Natural Science Foundation of China [51678426, 51538008]
- Key Program for International S&T Cooperation Projects of China [2014DFA91650]
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Digested sludge, as the main by-product of the sewage sludge anaerobic digestion process, still contains considerable organic compounds. In this protocol, we report a facile method for preparing digested sludge-derived self-doped porous carbon material for high-performance supercapacitor electrodes via a sustainable pyrolysis/activation process. The obtained digested sludge-derived carbon material (HPDSC) exhibits versatile O-, N-doped hierarchical porous framework, high specific surface area (2103.6 m(2) g(-1)) and partial graphitization phase, which can facilitate ion transport, provide more storage sites for electrolyte ions and enhance the conductivity of active electrode materials. The HPDSC-based supercapacitor electrodes show favourable energy storage performance, with a specific capacitance of 245 F g(-1) at 1.0 Ag-1 in 0.5M Na2SO4; outstanding cycling stability, with 98.4% capacitance retention after 2000 cycles; and good rate performance (211 F g(-1) at 11 A g(-1)). This work provides a unique self-doped three-dimensional hierarchical porous carbon material with a favourable charge storage capacity and at the same time finds a high value-added and environment-friendly strategy for disposal and recycling of digested sludge.
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