Journal
RSC ADVANCES
Volume 6, Issue 91, Pages 88674-88682Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra18725k
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Funding
- Independent Study Projects of the State Key Laboratory of Pulp and Paper Engineering [2016TS01, 2015C08, 2015ZD03]
- National Science Foundation of China [51673072]
- Science and Technology Program of Guangzhou, China [201504010033]
- New Century Excellent Talents in University [NCET-13-0215]
- Fundamental Research Funds for the Central Universities, SCUT [201522036]
- Opening Project of the Key Laboratory of Polymer Processing Engineering, Ministry of Education, China [KFKT-201401]
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We present a facile and green approach to simultaneously synthesize fluorescent carbon dots and porous active carbon for supercapacitors via a two-step carbonization process from a widely available protein-rich biomass precursor - soybeans. Fluorescent soybean carbon dots (SCDs) with inherent nitrogen-doping were obtained in the first low-temperature carbonization step, while hierarchical porous carbon with an interconnected microstructure was obtained by follow-up high-temperature carbonization with the insoluble residues. The effect of the activating agent (KOH) on the microstructure, conductivity, and nitrogen-doping degree of the porous carbon were explored. Significantly, we demonstrate that much less corrosive KOH (weight ratio: KOH/residue = 0.5/1) is needed to achieve a high specific surface area (1663.1 m(2) g(-1)) and remarkable capacitive performance with high specific capacitance (337.3 F g(-1) at 1 A g(-1)). This work provides a completely distinctive way for full utilization of biomass.
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