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Open AccessArticle

α- and β-Phase Ni-Mg Hydroxide for High Performance Hybrid Supercapacitors

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Jiangsu Key Laboratory for the Chemistry of Low-Dimensional Materials, School of Chemistry and Chemical Engineering, Huaiyin Normal University, Huai’an 223001, China
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State Key Laboratory of Coordination Chemistry, Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China
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School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng 224051, China
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Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(12), 1686; https://doi.org/10.3390/nano9121686
Received: 7 October 2019 / Revised: 14 November 2019 / Accepted: 20 November 2019 / Published: 25 November 2019
Mg-substituted α- and β-phase nickel hydroxides with high specific capacitance and good stability have been synthesized via sacrificial metal-based replacement reaction. 2D α- and β-phase nickel-magnesium hydroxide (NiMg-OH) have been synthesized by sacrificing magnesium (Mg) powder with nickel salt aqueous solutions. Interestingly, the phase of the obtained NiMg-OH can be controlled by adjusting the nickel precursor. As well, the Mg powder is used not only as Mg source but also alkali source to form NiMg-OH. The α-phase nickel-magnesium hydroxide sample (α-NiMg-OH) exhibits lager surface area of 290.88 m2 g–1. The electrochemical performances show that the α-NiMg-OH presented a superior specific capacitance of 2602 F g–1 (1 A g–1) and β-phase nickel-magnesium hydroxide sample (β-NiMg-OH) exhibits better stability with 87% retention after 1000 cycles at 10 A g–1. The hybrid supercapacitor composed of α-NiMg-OH and activated carbon (AC) display high storage performance and cycle stability, it presents 89.7 F g–1 (1 A g–1) and of 0–1.6 V potential window and it maintains capacitance retention of 84.6% subsequent to 4000 cycles. View Full-Text
Keywords: Ni-Mg hydroxides; α- and β-phases; energy storage; supercapacitor Ni-Mg hydroxides; α- and β-phases; energy storage; supercapacitor
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Yin, J.; Zhou, G.; Gao, X.; Chen, J.; Zhang, L.; Xu, J.; Zhao, P.; Gao, F. α- and β-Phase Ni-Mg Hydroxide for High Performance Hybrid Supercapacitors. Nanomaterials 2019, 9, 1686.

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