Generally, the capacitive capability of supercapacitors highly depends on the electrode materials. HPCs have been extensively studied as a promising electrode candidate for supercapacitors because of their large specific surface area (SSA), ideal hierarchical porous structure and low cost. Compared with the complicated, time-consuming and high cost traditional demineralization method, we creatively introduce extraction and back-extraction method to obtain the desired ash-free group component-loose medium component (LMC) from raw coal and adopt it as the precursor for preparation of hierarchical porous carbon materials (HPCs).
#Supercal humic how to#
Considering the sustainable development of resource and environment protection, how to realize the utilization of coal with high ash matter cleanly and effectively, has become an important issue to researchers. Supercapacitors are an excellent alternative to traditional methods of energy storage like batteries and dielectric capacitors, meanwhile coal as the most affordable and abundant energy resource currently, has also been commonly used as carbon source for electrode materials of supercapacitors. The representing promising application as a green route to synthesis advance nanoporous carbon materials from Ipomoea carnea biomass for high-capacity supercapaciors. Therefore the present results show the suitability of synthesized material for use in energy storage applications. The electrochemical performance of prepared nanoporous structured carbon electrode is studied in non-aqueous (TEABF4) electrolyte, which exhibits high specific capacitance of 257 Fg ⁻¹ maximum energy density of 61.46 Wh kg ⁻¹ and power density of 13.32 kW kg ⁻¹ at 1 Ag ⁻¹ with remarkable capacity retention of 90 % for 10000 cycles.
The effective novel synthesized scheme and hierarchical nanoporous carbon structure with large specific surface areas of 1264.9 m ² g ⁻¹ and mean pore diameter of 2.1628 nm. The mixture of ferric chloride and diethyl ether of the activating agent and the impregnation ratios are investigated under constant temperature at 800 ☌ for 2 h. In this study, we report the hierarchically nanoporous activated carbons syntheses from most abundant bio-weed source of Ipomoea carnea stems by nickel foam template assisted with chemical and thermal activation method. This work demonstrates a promising preparation route for large-scale production of hierarchical porous carbons for high-performance supercapacitors. Moreover, the porous carbons had high area specific capacitance (up to 33.4 μF cm⁻²), superior cycling performance, and low resistance. The respective specific capacitances for LPC and BPC were 223 and 200 F g⁻¹ at current density of 50 mA g⁻¹, and 175 and 151 F g⁻¹ at current density of 2.5 A g⁻¹ in a 3 M KOH electrolyte. These porous carbons applied as electrode materials for supercapacitors exhibited an excellent capacitive behavior in basic, acid, and neutral aqueous electrolytes. The porous carbons obtained from leonardite potassium humate (denoted as LPC) and biotechnology potassium humate (denoted as BPC) showed macro-meso-micro hierarchical porous structure, moderate surface area (668 m² g⁻¹ for LPC and 604 m² g⁻¹ for BPC) and were enriched in oxygen-containing functional groups on the surface. Moreover, the PH-Mn-0.1 shows an enhanced rate capability due to its improved wettability, and novel cycle performance with an increasing specific capacitance during the 1000 charge–discharge cycles at 2500 mA g−1.Ī simple, cost-effective, and environmentally friendly strategy for the preparation of porous carbons for supercapacitors via direct carbonization of potassium humate is presented. When used as electrode material for two-electrode symmetric supercapacitor, the PH-Mn-0.1 delivers higher volumetric capacitance of 276 F cm−3 at a current density of 50 mA g−1, consisting of pseudocapacitance related to MnO nanoparticles and electric double layer capacitance, a maximum energy density of 7.45 Wh kg−1 and low electrochemical resistance. The PH-Mn-0.1 displays a hierarchical porosity with a moderate surface area of 776 m2 g−1 and total pore volume of 0.487 cm3 g−1, and MnO nanoparticles were uniformly deposited on the porous carbon matrix with a Mn content of 6.7 wt%. Manganese nitrate in precursors has a synergistic catalysis effect with potassium element on the pore forming, also leads to an increased oxygen content of as-prepared composite. The hierarchical porous carbon/MnO composites were prepared from the homogenous mixture of potassium humate and manganese nitrate via one-step carbonization at 700 ☌.
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