Ultrathin Mn Doped Ni-Mof Nanosheet Array For Highly Capacitive And Stable Asymmetric Supercapacitor

In this study, we demonstrate that an Mn-doped ultrathin Ni-MOF nanosheet array on nickel foam (Mn-0.1-Ni-MOF/NF) serves as a highly capacitive and stable supercapacitor positive electrode. The Mn-0.1-Ni-MOF/NF shows an areal capacity of 6.48 C cm(-2) (specific capacity C: 1178 C g(-1)) at 2 mA cm(-2) in 6.0 m KOH, outperforming most reported MOF-based materials. More importantly, it possesses excellent cycle stability to maintain 80.6 % capacity after 5000 cycles. An asymmetric supercapacitor device utilizing Mn-0.1-Ni-MOF/NF as the positive electrode and activated carbon as the negative electrode attains a high energy density of 39.6 Wh kg(-1) at 143.8 Wkg(-1) power density with a capacitance retention of 83.6 % after 5000 cycles.