Digested sludge-derived three-dimensional hierarchical porous carbon for high-performance supercapacitor electrode

Royal Society Open Science
Jia-Jia ZhangShi-Jie Yuan

Abstract

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 m2 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 A g-1 in 0.5 M 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.

References

May 14, 2011·Science·Yanwu ZhuRodney S Ruoff
Jul 19, 2011·Waste Management·Murari Mohon RoyLucas Dickie
Feb 18, 2012·Waste Management·Alexandros Kelessidis, Athanasios S Stasinakis
Mar 12, 2016·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Thomas Nesakumar Jebakumar Immanuel EdisonMathur Gopalakrishnan Sethuraman
Jun 15, 2016·Advanced Materials·Jingyi ZhuRamakrishna Podila
Aug 2, 2016·Journal of Photochemistry and Photobiology. B, Biology·Thomas Nesakumar Jebakumar Immanuel EdisonYong Rok Lee

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Methods Mentioned

BETA
transmission electron microscopy
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