Abstract
Nanofabrication of heteroatom-doped metal oxides into a well-defined architecture via a “bottom-up” approach is crucial to overcome the boundaries of the metal oxides for energy storage systems. In the present work, this issue was addressed by developing sulfur-doped bimetallic cobalt tungstate (CoWO4) porous nanospheres for efficient hybrid supercapacitors via a single-step, ascendable bottom-up approach. The combined experimental and kinetics studies revealed enhanced electrical conductivity, porosity, and openness for ion migration after amendments of the CoWO4 via sulfur doping. As a result, the sulfur-doped CoWO4 nanospheres exhibited a specific capacity of 248.5 mA h g−1 with outstanding rate capability and cycling stability. The assembled hybrid supercapacitor cell with sulfur-doped CoWO4 nanospheres and activated carbon electrodes could be driven reversibly in a voltage of 1.6 V and exhibited a specific capacitance of 177.25 F g−1 calculated at 1.33 A g−1 with a specific energy of 63.41 Wh kg−1 at 1000 W kg−1 specific power. In addition, the hybrid supercapacitor delivered 94.85 % initial capacitance over 10000 charge-discharge cycles. The excellent supercapacitive performance of sulfur-doped CoWO4 nanospheres may be credited to the sulfur doping and bottom-up fabrication of the electrode materials.
Original language | English |
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Pages (from-to) | 1602-1611 |
Number of pages | 10 |
Journal | ChemSusChem |
Volume | 14 |
Issue number | 6 |
DOIs | |
State | Published - 22 Mar 2021 |
Keywords
- energy storage
- heteroatom doping
- nanospheres
- specific capacitance
- supercapacitors