Metal‐Organic‐Framework‐Derived MCo2O4 (M=Mn and Zn) Nanosheet Arrays on Carbon Cloth as Integrated Anodes for Energy Storage Applications

Abstract Electrode materials with special microstructures derived from metal‐organic frameworks (MOFs) exhibited high performance in electrochemical energy storage devices. In this manuscript, using freshly prepared Co−MOF nanosheet arrays as the self‐sacrificed template, MCo 2 O 4 (M=Mn and Zn) nanosheet arrays were successfully grown on carbon cloth (CC) by using a facile solution method. As‐prepared MnCo 2 O 4 @CC and ZnCo 2 O 4 @CC were used as the integrated electrodes for supercapacitors and Li‐ion batteries. Studies found that both integrated electrodes delivered high capacity and a long cycling life of 20 000 cycles with the capacity retention of 95.5 % for MnCo 2 O 4 @CC and 94.7 % for ZnCo 2 O 4 @CC at the current density of 50 mA cm −2 , respectively. Assembled into asymmetric supercapacitors with carbon nanosheet arrays@CC (CNS@CC), the obtained maximum energy densities were measured to be 25.6 Wh kg −1 at the power density of 3.4 kW kg −1 for MnCo 2 O 4 @CC//CNS@CC based device and 22.7 Wh kg −1 at the power density of 4.1 kW kg −1 for ZnCo 2 O 4 @CC//CNS@CC based device, respectively. In addition, both integrated electrodes also showed good lithium storage performance, delivering high capacities of 1289 mA h/g (MnCo 2 O 4 @CC) and 1376 mA h/g (ZnCo 2 O 4 @CC) even after 200 cycles at the current density of 1 A g −1 , respectively. The outstanding performances suggest the potential of both nanosheet arrays integrated electrodes for extensive applications in energy storage devices.