Incorporation of CeO<sub>2</sub> Nanosheets into MnCoSx Hollow Nanorods for Next Generation Supercapacitors
Zeynab Molaei, Ali Akbar Asgharinezhad, Afsanehsadat Larimi, Cyrus Ghotbi, Farhad Khorasheh
Abstract
Cerium oxide facilitates redox reactions due to the presence of a reversible redox couple, but its conductivity is not high. The presence of manganese–cobalt sulfide (MnCoS) as a transition metal sulfide, along with cerium oxide, boosts the electrical conductivity and electrochemical properties. Herein, MnCoS hollow nanorods were synthesized on cerium oxide nanosheets (MnCoS/CeO 2 ) using a hydrothermal technique. The specific capacitance is 772.5 F g –1 at 1 A g –1 for MnCoS/CeO 2 . It also demonstrated high cyclic stability, maintaining an 89% capacitance after 2500 cycles. Additionally, a battery-type asymmetric supercapacitor (MnCoS/CeO 2 //activated carbon) was constructed with an energy density of 24.9 Wh kg –1 at 407.6 W kg –1 . The device capacitance is retained at 75% after 5000 cycles, showing good cyclic stability. These findings suggest that the MnCoS/CeO 2 composite offers significant potential for enhancing supercapacitor performance and energy storage devices in general.