Journal
RSC ADVANCES
Volume 7, Issue 52, Pages 32795-32805Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ra05355j
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Funding
- National Natural Science Foundation of China [21506184]
- CAS Key Laboratory of Biobased Material [KLBM2016010]
- PhD Startup of XTU [15QDZ13]
- Postdoctoral Science Foundation [2015M572258]
- Project of Postgraduate Research Innovation [CX2017B335]
- Education Department of Hunan Province [16C1536]
- Hunan Collaborative Innovation Center of Chemical Engineering
- Environmental Benignity and Effective Resource Utilization
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Using biomass as a precursor for N-doped carbons is critical for future energy storage. Herein, macroalgae pollutants of Enteromorpha prolifera were used to obtain N-doped carbons from carbonization and activation after freeze-drying treatment. The pore structure and surface chemistry of carbons can be altered by adjusting the activation conditions with surface areas up to 3345 m(2) g(-1) consisting of hierarchical pores, and rich N (1.5-3.7%) groups, making algae a good choice for N-doped carbons as adsorbents and electrode materials. Significantly, H-2 uptake is high, up to 7.05 wt% at -196 degrees C and 20 bar, and an exceptional uptake of 2.71 wt% is also observed at 1 bar, among the largest data relative to state-of-art biomass-based carbons. Electrochemical test results confirmed that the carbon with the largest surface area had a capacitance of 440 F g(-1) at 1 A g(-1) in 6 M KOH electrolyte while the carbon with the largest microporous surface area had good cycling stability with 87% initial capacitance after 5000 cycles due to its hierarchical pores with high surface areas providing many active sites for better facilitating electrolyte diffusion.
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