Metal-Node-Engineered MOF-Derived Cobalt Manganese Selenide with Synergetic Surface Tailoring for Energy Storage Applications
A. Dennyson Savariraj, Loganathan Kulandaivel, JeongWon Park, Periyasamy Sivakumar, Byung Chul Kim, Byung Chul Kim, Hyun Jung
Abstract
Nickel foam-supported binder-free cobalt manganese selenide (CoMnSe@NF) was grown by in situ deposition using metal organic frameworks (MOFs) as the template with metal node engineering. The CoMnSe@NF electrode employed as the positive electrode for supercapacitors delivered well-pronounced conductivity, a high areal capacity ( C a ) of 1714 mC cm –2 at 1 mA cm –2, and a specific capacity ( C s ) of 519 C g 1– (1 A g –1 ) withstanding over 5000 cycles with a good retention of 87% of its initial capacity. The outstanding electrochemical profile of CoMnSe@NF can be credited to the tailor-made synergetic surface, bearing densely packed 2-dimensional sheets harboring numerous redox sites with an even distribution of voids, allowing easy passageway and diffusion of the electrolyte. Armed with the said caliber of CoMnSe@NF, the asymmetric device fabricated (CoMnSe@NF-2h//O, N, S@AC@NF) delivered a remarkable specific capacity ( C s ) of 139 C g –1, maximum energy density ( E s ) of 35.47 W h kg –1, and a power density of 11,500 W kg –1, remaining intact beyond 10,000 charge–discharge cycles and retaining 82.6% of the initial capacity.