1. Electrodeposited molybdenum-doped Co3O4 nanosheet arrays for high-performance and stable hybrid supercapacitors.
- Author
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Shen, Honglong, Yang, Xiaoqiang, Song, Juanjuan, Gao, Haiwen, Wu, Zongdeng, Yu, Jia, Lei, Wu, Yang, Jiazhi, He, Guangyu, and Hao, Qingli
- Subjects
TRANSITION metal oxides ,SUPERCAPACITORS ,BAND gaps ,POWER density - 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 Co
3 O4 nanosheets arrays on nickel foam (noted as Mox Co1.5−x O/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 Mox Co1.5−x O lead to excellent capacitive performance due to the doping of Mo into Co3 O4 . The as-prepared Mo0.25 Co1.25 /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 Co3 O4 ) 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. [ABSTRACT FROM AUTHOR]- Published
- 2022
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