I synthesized rGO/Co3O4 nanocompsites employing a temperate coprecipitation method.The maximum ratio of rGO is 10%.The BET analysis show an increase in the surface area of composite as rGO ratio increase...I need an explanation.
graphene is sea of electron and its ring having area very high from 500 to 1000 or 2000 m3/g
so reduced have low defect and that make all site of the graphene available to transport electrons very fast
In all likelihood, in the range of rGO used, the metal oxide forms larger clusters at lower rGO concentrations resulting in lowered surface area of the metal oxides. As your rGO contnet increases, the cluster sizes become smaller resulting in an increase in surface area.
Another possibility is that, the cluster sizes do not change but simply the fact that rGO has a higher specific surface area than Co3O4 particles precipitated and as a result as you increase the rGO content, the specific surface area increases. You need to differentiate as to awhich of the two are occurring.
The Brunauer-Emmett-Teller (BET) specific surface areas of
rGO@Co3O4, Co3O4-rGO-Co3O4 and Co3O4 are 198.54, 494.54 and
32.54 m2 g1
, severally. With the addition of rGO, the specific
surface areas are increased. The large difference of specific surface
areas of rGO@Co3O4 and Co3O4-rGO-Co3O4 may due to the forms of
rGO, a coating or a supporting layer.
Ref:Electrochimica Acta 215 (2016) 410–419
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