Research on nitric acid activation and its electrochemical performance of residual carbon from coal gasification fine slag
The application of carbon materials prepared by residual carbon(RC)from coal gasification fine slag as active materials for electrodes can not only reduce solid waste pollution and lower the cost of electrode materials,but also effectively change the physical structure and surface chemical properties of carbon materials through acid treatment.Using nitric acid(HNO3)to activate RC,adjusting the pore structure and surface functional groups of RC by changing the activation temperature,and its effect on the electrochemical performance of active materials was explored.When 2 mol/L HNO3 was used as an activator and activated at 80 ℃ for 2 hours,the current density of the active material(RCH-3)was 0.5 A/g,and the specific capacitance reached 104.0 F/g.At a current density of 2.0 A/g,the symmetrical supercapacitor using RCH-3 as the active material maintained a capacitance value of 96.03％of its initial value after 10 000 cycles,demonstrating better cycling stability.This was due to the rich oxygen-containing functional groups,high wettability,large surface area,and mesoporous ratio of RCH-3.
gasification fine slagresidual carbonactivationelectrochemical performance
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