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Bottom‐up Approach for Designing Cobalt Tungstate Nanospheres through Sulfur Amendment for High‐Performance Hybrid Supercapacitors
Author(s) -
Patil Swati J.,
Chodankar Nilesh R.,
Huh Yun Suk,
Han YoungKyu,
Lee Dong Weon
Publication year - 2021
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202002968
Subject(s) - supercapacitor , materials science , heteroatom , nanotechnology , capacitance , cobalt , sulfur , chemical engineering , cobalt sulfide , tungstate , carbon fibers , doping , electrode , composite number , chemistry , optoelectronics , electrochemistry , composite material , organic chemistry , metallurgy , ring (chemistry) , engineering
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 (CoWO 4 ) 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 CoWO 4 via sulfur doping. As a result, the sulfur‐doped CoWO 4 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 CoWO 4 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 CoWO 4 nanospheres may be credited to the sulfur doping and bottom‐up fabrication of the electrode materials.