Biomass straws are often regarding as agricultural waste, usually burned off in rural areas, which results in severe resource waste andair pollution. In this work, biomass-based porous carbon material with a lamellar ...Biomass straws are often regarding as agricultural waste, usually burned off in rural areas, which results in severe resource waste andair pollution. In this work, biomass-based porous carbon material with a lamellar microstructure is obtained via simple hydrothermaland subsequent KOH activation, the optimum activate process is determined by the proportion of activator. Scanning electronmicroscopy (SEM) and nitrogen adsorption techniques are conducted to investigate the physical properties of the materials. Cyclicvoltammetry and constant current discharge/charge in the three-electrode system and symmetrical double-layer capacitors resultsindicate the best electrochemical performance of SCA-1.5 electrode material, with a capacity of 250.0 F g-1 at 1.0 A g-1. And notably,high recycling stability at a high cycling rate of 1.0 A g-1 after 18,000 cycles.展开更多
Egg shell waste was used as an activation agent directly for the manufacture of a biomass-derived porous carbon,which possessed a surface area of 626 m2·g-1 and was rich in nitrogen,sulfur and oxygen functionalit...Egg shell waste was used as an activation agent directly for the manufacture of a biomass-derived porous carbon,which possessed a surface area of 626 m2·g-1 and was rich in nitrogen,sulfur and oxygen functionalities.The activation mechanism was proposed,and the carbon showed its potential to act as an adsorbent for the adsorptive removal of various contaminants from both aqueous and non-aqueous solutions,possessing maximum adsorption capacities of 195.9,185.1,125.5 and 44.6 mg·g-1 for sulfamethoxazole,methyl orange,diclofenac sodium and dibenzothiophene,respectively.Through the utilization of egg shell waste as a sustainable activation agent,this work may help to make the widely applied biomass-derived porous carbons more economical and ecological.展开更多
Porous carbons （PC） were prepared from a waste biomass named chestnut shell via a two-step method involving carbonization and KOH activation. The morphology, pore structure and surface chemical properties were inves...Porous carbons （PC） were prepared from a waste biomass named chestnut shell via a two-step method involving carbonization and KOH activation. The morphology, pore structure and surface chemical properties were investigated by scanning electron microscopy （SEM）, N2 sorption, Raman spectroscopy, X-ray diffraction （XRD） and X-ray photoelectron spectroscopy （XPS）. The carbons have been evaluated as the electrode materials for supercapacitors by a two-electrode system in 6 mol/L KOH electrolyte. Benefiting from the porous texture, high surface area and high oxygen content, the PCs derived from chestnut shell have exhibited high specific capacitance of 198.2 （PC-l）, 217.2 （PC-2） and 238.2 F·g^-1 （PC-3） at a current density of 0.1 Aog l, good rate capability of 55.7%, 56.6% and 54.9% in a range of 0.1 -20 A·g^-1 and high energy density of 5.6, 6.1 and 6.7 Wh·kg^-1, respectively. This is believed to be due to electric double layer capacitance induced by the abundant micropores and extra pseudo-capacitance generated by oxygen-containing groups. At a power density of 9000 Wh·kg^-1, the energy density is 3.1, 3.5 and 3.7 Whokg 1 for PC-l, PC-2 and PC-3, respectively, demonstrating the potential of the carbons derived from chestnut shells in energy storage devices.展开更多
基金This work was supported by the Research Foundation for Distinguished Scholars of Qingdao Agricultural University(665-1119008).The authors thank the Central Laboratory of Qingdao Agriculture University for the physical characterization.
文摘Biomass straws are often regarding as agricultural waste, usually burned off in rural areas, which results in severe resource waste andair pollution. In this work, biomass-based porous carbon material with a lamellar microstructure is obtained via simple hydrothermaland subsequent KOH activation, the optimum activate process is determined by the proportion of activator. Scanning electronmicroscopy (SEM) and nitrogen adsorption techniques are conducted to investigate the physical properties of the materials. Cyclicvoltammetry and constant current discharge/charge in the three-electrode system and symmetrical double-layer capacitors resultsindicate the best electrochemical performance of SCA-1.5 electrode material, with a capacity of 250.0 F g-1 at 1.0 A g-1. And notably,high recycling stability at a high cycling rate of 1.0 A g-1 after 18,000 cycles.
基金Financial support from the National Natural Science Foundation of China(Grant Nos.5197846551908409+2 种基金51638011)the Science and Technology Plans of Tianjin(Grant No.19JCZDJC39800)China Postdoctoral Science Foundation(Grant No.2018M641655)。
文摘Egg shell waste was used as an activation agent directly for the manufacture of a biomass-derived porous carbon,which possessed a surface area of 626 m2·g-1 and was rich in nitrogen,sulfur and oxygen functionalities.The activation mechanism was proposed,and the carbon showed its potential to act as an adsorbent for the adsorptive removal of various contaminants from both aqueous and non-aqueous solutions,possessing maximum adsorption capacities of 195.9,185.1,125.5 and 44.6 mg·g-1 for sulfamethoxazole,methyl orange,diclofenac sodium and dibenzothiophene,respectively.Through the utilization of egg shell waste as a sustainable activation agent,this work may help to make the widely applied biomass-derived porous carbons more economical and ecological.
基金We are grateful for the financial support from the National Natural Science Foundation of China （Nos. 21402108, 21476132, 51302156 and 21576158）, the Natural Science Foundation of Shandong Province （No. ZR2014BQ036） and the Young Teacher Supporting Fund of Shandong University of Technology.
文摘Porous carbons （PC） were prepared from a waste biomass named chestnut shell via a two-step method involving carbonization and KOH activation. The morphology, pore structure and surface chemical properties were investigated by scanning electron microscopy （SEM）, N2 sorption, Raman spectroscopy, X-ray diffraction （XRD） and X-ray photoelectron spectroscopy （XPS）. The carbons have been evaluated as the electrode materials for supercapacitors by a two-electrode system in 6 mol/L KOH electrolyte. Benefiting from the porous texture, high surface area and high oxygen content, the PCs derived from chestnut shell have exhibited high specific capacitance of 198.2 （PC-l）, 217.2 （PC-2） and 238.2 F·g^-1 （PC-3） at a current density of 0.1 Aog l, good rate capability of 55.7%, 56.6% and 54.9% in a range of 0.1 -20 A·g^-1 and high energy density of 5.6, 6.1 and 6.7 Wh·kg^-1, respectively. This is believed to be due to electric double layer capacitance induced by the abundant micropores and extra pseudo-capacitance generated by oxygen-containing groups. At a power density of 9000 Wh·kg^-1, the energy density is 3.1, 3.5 and 3.7 Whokg 1 for PC-l, PC-2 and PC-3, respectively, demonstrating the potential of the carbons derived from chestnut shells in energy storage devices.
