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

ABSTRACT: 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)

SUBMITTER: Yin J 

PROVIDER: S-EPMC6955959 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature