High capacity Mo7S8 nanosheets with electrodeposited alpha-Co(OH)2 thin layer as positive electrode in hybrid potassium dual-ion supercapacitors
Qiu G. Zhang Z. Pameté E. He Y. Pan X. Chen M. Luo S. Supiyeva Z. Abbas Q. Chen X.
1 August 2023Elsevier Ltd
Electrochimica Acta
2023#458
Alpha-Co(OH)2 nanoflakes are grown on Mo7S8 electrodes by galvanostatic electrodeposition. The influence of various electrodeposition time durations on the electrochemical properties of alpha-Co(OH)2@Mo7S8 electrodes is compared. When the optimized deposition time is 1440 s, alpha-Co(OH)2@Mo7S8 composite electrode obtains the highest specific capacity of 484.8 C g−1, the lowest internal resistance of 1.96 Ω, the shortest time constant of 2.15 s, and the maximum diffusion coefficient of 2.27 × 10−14 cm2 s−1. The kinetic analysis of this electrode reveals the highest diffusion and the lowest non-diffusion contributions of 76.25% and 23.75% at 0.5 mV s−1, respectively. Ex-situ X-ray photoelectron spectroscopy shows that chemical valences of Mo and Co increased from +2 to +4 and from +2 to +3 after OH− insertion, respectively. The hybrid potassium dual-ion supercapacitor is assembled with alpha-Co(OH)2@Mo7S8 cathode (positive electrode) and molybdenum-phosphate-based MoPO@Mo7S8 anode (negative electrode). The device exhibits remarkable capacitance characteristics with a high specific energy of 59.4 Wh kg−1 at a specific power of 734 W kg−1 and a capacity-maintaining retention rate of 97.3% after 10,000 charge–discharge cycles.
Alalpha-Co(OH)2@Mo7S8 nanocomposite , Electrodeposition , Potassium dual-ion supercapacitors , Specific energy , Storage mechanism
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School of Chemical Engineering and Energy Technology, Dongguan University of Technology, Dongguan, 523808, China
School of Semiconductor Science and Technology, South China Normal University, Foshan, 528225, China
Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, Poznan, 60-965, Poland
Guangdong Jiuzhou Energy Storage Technology Co., Ltd., Zhongshan, 528437, China
Al-Farabi Kazakh National University, 71 al-Farabi Ave., Almaty, 050040, Kazakhstan
Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, Graz, 8010, Austria
SCNU Qingyuan Institute of Science and Technology Innovation Co., Ltd, Qingyuan, 511517, China
School of Chemical Engineering and Energy Technology
School of Semiconductor Science and Technology
Faculty of Chemical Technology
Guangdong Jiuzhou Energy Storage Technology Co.
Al-Farabi Kazakh National University
Institute for Chemistry and Technology of Materials
SCNU Qingyuan Institute of Science and Technology Innovation Co.
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