Abstract
Metal organic frameworks (MOFs) have been rapidly developed in the application of electrode materials due to their controllable morphology and ultra-high porosity. In this research, flower-like layered nickel-based bimetallic MOFs microspheres with different metal central ions were synthesized by solvothermal method. Compared with Ni-MOFs, the optimization of the specific capacitance of NiCo-MOFs and NiMn-MOFs was been confirmed. For example, the specific capacitance of NiCo-MOFs can reach 882 F·g−1 at 0.5 A·g−1 while maintaining satisfactory cycle life (the specific capacity remains 90.1% of the initial value after 3000 charge-discharge cycles at 5 A·g−1). In addition, the NiCo-MOFs//AC HSCs, which are composed of NiCo-MOFs and activated carbon (AC), achieved a maximum energy density of 18.33 Wh·kg−1 at a power density of 400 W·kg−1, and showed satisfactory cycle life (82.4% after 3000 cycles). These outstanding electrochemical properties can be ascribed to the synergistic effect between metal ions, the optimized conductivity, and the unique layered stacked flower structure, which provides a smooth transmission channel for electrons/ions. In addition, this research gives a general method for the application of MOFs in the field of supercapacitors.
Highlights
Serious deterioration of the environment and rapid depletion of energy resources have accelerated the exploration of green high-performance energy storage devices [1,2]
The hybrid supercapacitors (HSCs) made by assembling NiCo-Metal organic frameworks (MOFs) and activated carbon (AC) exhibited satisfactory energy density (18.33 Wh·kg−1 at 400 W·kg−1) and cycle life (82.4% after 3000 cycles)
The spectrum of Ni 2p of Ni-MOFs (Figure 1c), NiCo-MOFs (Figure 1g), NiMn-MOFs (Figure 1k), and NiCu-MOFs (Figure 1o) show almost the same diffraction peak positions, all showing two shake-up satellites and two characteristic peaks of Ni 2p3/2 (855.8 eV) and Ni 2p1/2 (873.7 eV), which can be assigned to the 2p orbits of Ni2+
Summary
Serious deterioration of the environment and rapid depletion of energy resources have accelerated the exploration of green high-performance energy storage devices [1,2]. As an emerging large-capacity energy storage device, supercapacitors have shown enormous potential development benefits due to their surprising power density and superior cycle life, which are more suitable for the demands of energy storage devices in industrial equipment, transportation, and electronic equipment [3,4]. Among the three types of electrode materials, electric double-layer capacitors (EDLCs), which are electrode materials represented by carbon-based materials, mainly store electric energy through electrostatic action, with long cycle life but low specific capacitance [5,6,7]. In order to further accelerate the exploration of HSCs, it is urgent and necessary to develop a new type of high-performance electrode material
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