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Open AccessArticle

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

Jiangsu Key Laboratory for the Chemistry of Low-Dimensional Materials, School of Chemistry and Chemical Engineering, Huaiyin Normal University, Huai’an 223001, China
State Key Laboratory of Coordination Chemistry, Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China
School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng 224051, China
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(12), 1686;
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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