Agradecimentos: Tasks related to the synthesis, characterization and electrochemical evaluation of biomass-derived carbons and the publication of this work are financially supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (301918/2016-3), Fundação de Amparo à Pesquisa do...

Agradecimentos: Tasks related to the synthesis, characterization and electrochemical evaluation of biomass-derived carbons and the publication of this work are financially supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (301918/2016-3), Fundação de Amparo à Pesquisa do Estado de São Paulo (CEPID-CDMF 2013/07296-2 and 2018/04487-5). Tasks related to battery assembly and testing are supported by the US National Science Foundation grant number NSF CAREER CMMI–1454151. The authors thank Jay Tuggle (Virginia Tech) for access to XPS facility

Biomass-derived carbons are among the most promising candidates for large-scale electrochemical-energy-storage devices owing to their low cost, sustainability and widespread resources. Herein, the authors report a simplistic synthesis process for preparing two types of biomass carbons derived from...

Biomass-derived carbons are among the most promising candidates for large-scale electrochemical-energy-storage devices owing to their low cost, sustainability and widespread resources. Herein, the authors report a simplistic synthesis process for preparing two types of biomass carbons derived from cassava stalks and bamboo consisting of direct pyrolysis of the ground samples at 750°C for 4 h. The electrochemical performances of the prepared biomass carbons are investigated in supercapacitors and lithium-ion battery (LIB) systems. Both the cassava and bamboo samples possess a high graphitization degree and good surface wettability as demonstrated by X-ray diffraction, Raman spectroscopy and Fourier transform infrared spectroscopy. As a supercapacitor electrode, cassava-derived carbons show the best performance with a maximum specific capacitance of 212 F/g and capacity retention of 95% after 2000 cycles. Moreover, as an electrode material for LIBs, cassava-derived carbons demonstrate the highest charge capacity of 357 mAh/g (at 100 mA/g), which stabilizes at 254 mAh/g. This approach shows great potential to achieve advanced electrode materials from low-cost, green and industrial-grade production of biomass-derived carbon materials by simple synthesis for advanced energy-storage applications in the future compared with conventional approaches

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