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Cauliflower-derived porous carbon without activation for electrochemical capacitor and CO2 capture applications

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Abstract

Carbon materials have attracted great attention in CO2 capture and energy storage due to their excellent characteristics such as tunable pore structure, modulated surface properties and superior bulk conductivities, etc. Biomass, provided by nature with non-toxic, widespread, abundant, and sustainable advantages, is considered to be a very promising precursor of carbons for the view of economic, environmental, and societal issues. However, the preparation of high-performance biomass-derived carbons is still a big challenge because of the multistep process for their synthesis and subsequent activation. Herein, hierarchically porous structured carbon materials have been prepared by directly carbonizing dried cauliflowers without any addition of agents and activation process, featuring with large specific surface area, hierarchically porous structure and improved pore volume, as well as suitable nitrogen content. Being used as a solid-state CO2 adsorbent, the obtained product exhibited a high CO2 adsorption capacity of 3.1 mmol g−1 under 1 bar and 25 °C and a remarkable reusability of 96.7% retention after 20 adsorption/regeneration cycles. Our study reveals that choosing a good biomass source was significant as the unique structure of precursor endows the carbonized product with abundant pores without the need of any post-treatment. Used as an electrode material in electrochemical capacitor, the non-activated porous carbon displayed a fairly high specific capacitance of 228.9 F g−1 at 0.5 A g−1 and an outstanding stability of 99.2% retention after 5000 cycles at 5 A g−1.

Hierarchically porous structured carbon materials are prepared by directly carbonizing dried cauliflower without any agents and process of activation for high performance of CO2 capture and capacitor.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (21676070), Hebei Natural Science Foundation (B2015208109), Hebei Training Program for Talent Project (A201500117), Five Platform Open Fund Projects of Hebei University of Science and Technology (2015PT37), Hebei One Hundred-Excellent Innovative Talent Program (III) (SLRC2017034), Hebei Science and Technology Project (17214304D, 16214510D), Science Technology Department of Zhejiang Province (2015C31118), Zhejiang Provincial Natural Science Foundation of China (LR16B030001), and International Science and Technology Cooperation Program of Ningbo City (2014D10004).

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Correspondence to Chunlin Chen.

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Du, J., Yu, Y., Lv, H. et al. Cauliflower-derived porous carbon without activation for electrochemical capacitor and CO2 capture applications. J Nanopart Res 20, 15 (2018). https://doi.org/10.1007/s11051-017-4109-y

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  • DOI: https://doi.org/10.1007/s11051-017-4109-y

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