Novel Cd-doped Co/C nanoparticles for electrochemical supercapacitors

•Cd-doped Co/C NPs are introduced to be used in the electrochemical supercapacitors.•Introduced NPs revealed good performance, specific capacitance 255 F/g.•Introduced NPs have been prepared by simple sol–gel technique.•Nanoparticles are shelled in a thin graphite layer.

Novel cadmium-doped cobalt nanoparticles encapsulated in graphite shell are introduced to be utilized in the electrochemical supercapcitors. Electrochemical characterization for the introduced NPs indicated that the corresponding specific capacitance is 255 F/g with good stability. The introduced NPs were synthesized using a simple sol–gel technique. Typically, a sol–gel composed of cadmium acetate, cobalt acetate and poly(vinyl alcohol) was prepared based on the polycondensation property of the acetate anions. The utilized physiochemical characterizations affirmed that drying, grinding and calcination in Ar atmosphere of the prepared gel leads to produce Cd-doped Co nanoparticles encapsulated in a thin graphite layer. Overall, the present study opens a new avenue for the encapsulated bimetallic nanostructures to be used as effective materials in the electrochemical supercapacitors.

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