Abstract
Long-cycle stability and high-energy density are big challenges for developing high-performance hybrid supercapacitor (HSC) electrode materials. In this work, molybdenum-doped Co3O4 nanosheets arrays on nickel foam (noted as MoxCo1.5−xO/NF) are successfully prepared via facile one-step electrodeposition followed by annealing for hybrid supercapacitors. The experimental and calculated results indicate that the band gap modification and conductivity enhancement of MoxCo1.5−xO lead to excellent capacitive performance due to the doping of Mo into Co3O4. The as-prepared Mo0.25Co1.25/NF electrode demonstrates a high specific capacity of 128.2 mAh g−1 (923 F g−1) at 1 A g−1 (60% higher than the undoped Co3O4) and superior cycle stability with 95.2% capacity retention after 10,000 cycles at 10 A g−1. The assembled HSC delivers high-energy density of 64.3 Wh kg−1 at the power density of 794.1 W kg−1 and with 87.7% capacity retention after 10,000 cycles. This work can present a new strategy to fabricate the three-dimensional high-performance integrated electrode materials by a facile electrodeposition for heteroatom-doped transition metal oxide for high-performance supercapacitors.
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Acknowledgements
We also thank the support of the Analysis and Test Center, Nanjing University of Science and Technology, for XRD data collection.
Funding
The work was supported by the National Natural Science Foundation of China (Nos. 51972173, 51872140), “333 program” of Jiangsu Province (BRA2019262), Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology (BM2012110), and the program for Science and Technology Innovative Research Team in Universities of Jiangsu Province, China.
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Highlights
(1) Mo doped Co3O4 nickel foam electrodes (MoxCo1.5-xO/NF) are synthesized by electrodeposition.
(2) The effect of Mo doping on the bandgap of Co3O4 and electrochemical properties was studied.
(3) Mo0.25Co1.25O/NF exhibits high specific capacity and superior capacity retention of 95.2% after 10000 cycles.
(4) The HSC device shows energy density of 64.3 Wh kg-1 at 794.1 W kg-1.
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Shen, H., Yang, X., Song, J. et al. Electrodeposited molybdenum-doped Co3O4 nanosheet arrays for high-performance and stable hybrid supercapacitors. J Solid State Electrochem 26, 353–363 (2022). https://doi.org/10.1007/s10008-021-05061-2
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DOI: https://doi.org/10.1007/s10008-021-05061-2