(537c) Se-Nanorods Decorated N-Rgonanocomposite for Application in Supercapacitors

It is experimentally proved that selenium and reduced graphene oxide have low specific capacitance due to their chemical nature. Nevertheless, selenium nanorods decorated rGO results in significant increase in the specific capacitance due to formation of the electrochemical double layer at the interfacial area. Moreover, the specific capacitance could be further enhanced by nitrogen doping the rGO sheets. Therefore, novel N-rGO/Se nanocomposite has been successfully synthesized by hydrothermal route starting with graphene oxide, selenium chloride and urea as raw materials. The composite was characterized by XRD, HR-TEM, FESEM, Raman and XPS techniques. The utilized physiochemical characterizations indicated that the final prepared composite can be demonstrated as N-doped rGO decorated by Se nanorods. The supercapacitive performance of the N-rGO/Se nanocomposite has been investigated by cyclic voltammetry and galvanostaticcharge-discharge in 1 M KOH solution and the results reveal that the N-rGO/Se nanocomposite has a large specific capacitance according to CV and galvanostatic charge-discharge tests, while the Se, rGO, and rGO/Se based electrodes has a poor electrochemical performance. Moreover, the as-prepared composite exhibited excellent long cycle stability after 5000 cycles.