Construction of Hierarchical NiCo2O4@Ni-MOF Hybrid Arrays on Carbon Cloth as Superior Battery-Type Electrodes for Flexible Solid-State Hybrid Supercapacitors
Li, Cai, Li, Zhang, Zhang, Yang, Xiong (2019) Construction of Hierarchical NiCo2O4@Ni-MOF Hybrid Arrays on Carbon Cloth as Superior Battery-Type Electrodes for Flexible Solid-State Hybrid Supercapacitors ACS Appl Mater Interfaces (IF: 9.5) 11(41) 37675-37684Abstract
Metal-organic frameworks (MOFs) have been considered as a class of promising electrode materials for supercapacitors owing to their large surface area, rich porosity, and variable redox sites; however, direct application of pristine MOFs in energy storage has been largely hindered by their poor electrical conductivity and stability issues. In this work, we demonstrate a facile two-step approach to address the controlled growth of Ni-MOF arrays on the surface of NiCo2O4 nanowires by modulating the formation reaction of MOFs. By taking advantage of the intriguing merits from the NiCo2O4 core and Ni-MOF shell as well as their synergistic effects, the optimized NiCo2O4@Ni-MOF hybrid electrode exhibits boosted electrochemical performance, in terms of high specific capacity (208.8 mA h/g at 2 mA/cm2) and good rate capability. In addition, the assembled flexible solid-state HSC device based on the optimized NiCo2O4@Ni-MOF and activated carbon as the cathode and anode achieves a maximum energy density of 32.6 W h/kg at a power density of 348.9 W/kg without sacrificing its outstanding cycling performance (nearly 100% retention over 6000 cycles at 8 mA/cm2) and mechanical stability, outperforming most recently reported MOF-based HSC devices in an aqueous electrolyte. Our work demonstrates the possibility of exploiting novel MOF-based hybrid arrays as battery-type electrodes with enhanced electrochemical properties, which exhibits great potential in flexible energy storage devices.
Links
http://www.ncbi.nlm.nih.gov/pubmed/31532185http://dx.doi.org/10.1021/acsami.9b11994
