Table 1.

Comparing the advantages and disadvantages of each type of material.

	Feature	Advantage	Disadvantage
Material
Carbon		Large specific surface area High conductivity Electrochemical stability Cheap price	Low energy density Poor dispersity
MXenes		Large specific surface area High conductivity Good dispersity Higher area capacitance	Complex production High prices Lower mass capacitance
Conductive polymers		High specific capacitance Unique solution processability Filming has good flexibility	Low conductivity Poor electrochemical stability
Transition metal oxides or hydroxides		High specific capacitance High energy density Wide potential window Low cost Easy to prepare	Low conductivity Poor electrochemical stability
Transition metal dichalcogenides		Large specific surface area High specific capacitance Good electrochemical stability	Preparing method is not mature. Physical and chemical properties are easily affected by the environment.