25 Questions
What are P-doped hierarchical porous carbon aerogels derived from?
phenolic resins
How is phosphoric acid used in the preparation procedure?
as the polymerization catalyst and P-doped agent
What is the energy density of the prepared sample at a power density of 200 W kg−1?
16.97 Wh kg−1
What is the specific capacitance of PPC-800-2 at a scan rate of 5 mV s-1?
406.2 F g-1
What is the coulomb efficiency of PPC-800-2 at a current density of 70 A g-1?
100.1%
What is the internal resistance of PPC-700-2 electrode material?
0.42 Ω
What is the purpose of the research mentioned in the text?
The purpose of the research is to enhance the capacitive performance of phenolic resin-based porous carbon materials.
What is one factor that can influence the structure and performance of phenolic resin-based porous carbon?
The choice of drying method can influence the structure and performance of phenolic resin-based porous carbon.
What is the most common doping atom used to improve the interaction between porous carbon frameworks and active sites?
Nitrogen is the most common doping atom used to improve the interaction between porous carbon frameworks and active sites.
What reagents were used in the electrochemical measurements?
The reagents used were phloroglucinol anhydrous, formaldehyde, phosphoric acid, ZnCl2, KOH, and ethanol absolute.
What was the mass loading of active material on each current collector?
The mass loading of active material on each current collector was 2 mg.
What were the potential window and scan rate for cyclic voltammetry?
The potential window for cyclic voltammetry was -1 to 0 V, and the scan rate ranged from 5 to 500 mV s^-1.
What is the effect of increasing the carbonization temperature on the relative intensity of the D peak and G peak?
The relative intensity of the D peak and G peak (ID/IG) value decreases gradually with increasing the carbonization temperature.
Which sample has the highest specific capacitance?
The sample prepared at 1000 °C has the highest specific capacitance.
What is the effect of KOH activation on the defects and structural distortions of the prepared samples?
KOH activation remarkably increases the defects and structural distortions of the prepared samples.
What is the equation for calculating the specific capacitance?
Cs = ∫ (I dV )/(vmΔV ) (1)
What is the equation for calculating the real capacitance?
C ″ = (Z′ (ω))/(ω|Z (ω)2| (3)
What is the equation for calculating the power density?
P = E /Δt (6)
What is the relationship between capacitance loss and frequency?
The higher the capacitance loss, the larger the corresponding frequency.
What does the vertex of the curve represent?
The vertex of the curve represents the maximum capacitance loss.
What does a larger frequency indicate?
A larger frequency indicates a shorter relaxation time (τ0).
What is the sample with the highest specific surface area?
Sample PPC-900-2 has the highest specific surface area with 89.03 m^2/g.
What is the micropore distribution centered at?
The micropore distribution is centered below 5 nm.
What is the range of the meso/micropore distributions?
The meso/micropore distributions range between 1 and 130 nm.
How do the hierarchical porous textures and large specific surface area of PPC-800-2 affect its electrochemical properties?
They improve its electrochemical properties by promoting fast diffusion and adsorption of potassium ions on the large electrode surface.
Test your knowledge on N2 adsorption/desorption isotherms and pore size distributions of PPC-x-2 (x = 700, 800, 900 °C) in this quiz. Learn about the electrochemical performance of the samples and the techniques used for testing.
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