N-doped two-dimensional ultrathin NiO nanosheets for electrochromic supercapacitor

The performance of electrochromic supercapacitors (ESCs) can be improved by the use of electrodes with high electronic conductivity and ion transport ability. Herein, two-dimensional (2D) N-doped NiO ultrathin nanosheets (N-NiO UTNSs) synthesized in situ on fluorine-doped tin oxide glass were used a...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2020-11, Vol.31 (22), p.20611-20619
Main Authors: Xue, Junying, Wang, Shen, Zhang, Hongming, Song, Ying, Li, Yao, Zhao, Jiupeng
Format: Article
Language:English
Subjects:
Asymmetry
Capacitance
Characterization and Evaluation of Materials
Chemistry and Materials Science
Color
Electrochromism
Electrodes
Fluorine
Ion diffusion
Ion transport
Light emitting diodes
Materials Science
Nanosheets
Nickel oxides
Optical and Electronic Materials
Supercapacitors
Thickness
Tin oxides
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Summary:The performance of electrochromic supercapacitors (ESCs) can be improved by the use of electrodes with high electronic conductivity and ion transport ability. Herein, two-dimensional (2D) N-doped NiO ultrathin nanosheets (N-NiO UTNSs) synthesized in situ on fluorine-doped tin oxide glass were used as bifunctional ESC electrodes. These electrodes exhibited an elevated specific capacitance (540 F g −1 at 1 A g −1 ), superior cycling stability (85% capacitance retention after 10,000 cycles), and good electrochromic properties (color change from colorless to black with a transmittance modulation of 73% and a coloration efficiency of up to 83.47 cm 2 C −1 at 550 nm), which was ascribed to the high electronic conductivity of NiO (due to N doping) and the short ion diffusion path (due to the ultralow nanosheet thickness). To further explore the practical applications of N-NiO UTNSs, we constructed asymmetric ESCs by integrating NiO films with Fe 2 O 3 films and revealed that these devices displayed applied voltage–dependent colors. Two charged asymmetric ESCs connected in series could light up a red light-emitting diode and changed color synchronously with charge state alteration. Thus, our results contribute to the development of Ni-based electrochromic supercapacitors exhibiting charge state-dependent color changes.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-020-04581-3