Study on the preparation and electrochemical behaviors of histidine-based N-doped hierarchical porous carbon as a supercapacitor material
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE(2023)
摘要
Hierarchical porous carbon materials can be obtained by etching carbonaceous materials with potassium hydroxide at high temperature. In this work, we chose the environment-friendly biomolecular galactose as the source to prepare carbon materials, histidine as the nitrogen source to improve the surface properties, and potassium hydroxide as the pore-forming agent. A series of carbon precursors were obtained via simultaneous calcination of histidine and galactose with different weight ratios under the nitrogen atmosphere. The porous carbon materials with meso/micro pores were further prepared using KOH as the activation agent. The optimal carbon material G8H1 featured with a large pore volume (1.05 cm3 center dot g-1) and a high proportion of mesopores (Vnonmicro/Vmicro=1.62), large specific surface area (2040.2 m2 center dot g-1), high content oxygen (12.6 at%) and nitrogen (2.32 at%), and good wettability. At three electrode system, G8H1 electrode material showed excellent specific capacitance performance 312 F center dot g-1 in the 6 M KOH electrolyte when the current density was 0.5 A center dot g-1. While symmetric supercapacitors were further assembled using 1 M Na2SO4, a capacitance of 85.4 F center dot g-1 at 0.05 A center dot g-1 was achieved with a maximal energy density of 38.43 kW center dot kg-1. Overall, the hierarchical porous carbon materials derived from biomolecules galactose and histidine showed excellent specific capacitance performance, which played a positive role in expanding the raw materials of synthetic carbon materials.
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关键词
hierarchical porous carbon,electrochemical behaviors,histidine-based,n-doped
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