Construction
of Hierarchical NiCo2O4@Ni-MOF Hybrid Arrays
on Carbon Cloth as Superior Battery-Type
Electrodes for Flexible Solid-State Hybrid Supercapacitors
Posted on 2019-09-26 - 10:29
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.
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Li, Geng; Cai, Haoran; Li, Xiaolong; Zhang, Jing; Zhang, Desuo; Yang, Yefeng; et al. (2019). Construction
of Hierarchical NiCo2O4@Ni-MOF Hybrid Arrays
on Carbon Cloth as Superior Battery-Type
Electrodes for Flexible Solid-State Hybrid Supercapacitors. ACS Publications. Collection. https://doi.org/10.1021/acsami.9b11994