I have observed higher values of supercapacitance of NRGO than rGO, which has better dispersion than rGO. But what can be the possible reason of higher supercapacitor performance? Has it something to do with conductivity?
try KPFM (kelvin probe atomic force microscopy ) , you will get better insight regarding conductivity of both materials.
Conductivity of reduced graphene oxide(rGO) and nitrogen-doped reduced graphene oxide (N-RGO) depends on the surface area .Generally, as surface area increases as electrical conductivity increases .During reduction process ,C/O ratio increase and rGO restore it's π--π conjugated structure, this improves it's conductivity.
Also,during reduction process ,rGO sheets tend to agglomerate due to the strong π-π interactions between them which decreases the specific surface area. Doping of rGO with nitrogen- containing functional groups causes an increase in interlayer spacing of rGO sheets and thereby increases the surface area and enhance conjugated structure.
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