Capacitive Performance of Zn-Ni Hydroxide Nano-sheet Arrays on Nickel Foams via a Mild Chemical-bath Deposition Process

doi:10.15541/jim20160333

Abstract

Abstract:

Zn-Ni hydroxide nano-sheets were successfully deposited on nickel foams through a mild, cost-effective chemical bath method. SEM observation shows that these interconnected nano-sheets form a uniform marray layer and completely cover the surface of nickel foam. At the same time, additional homogeneously-precipitated hydroxide nano-sheets locate in the skeleton voids of nickel foams as aggregated porous clumps, resulting in a relatively high mass-loading of 4.27 mg/cm². Afterwards, the electrochemical capacitive behaviors of this binder-free electrode were investigated by cyclic voltammetry, galvanostatic charge/discharge tests and electrochemical impedance spectroscopy. It is found that the Zn-Ni hydroxide electrode exhibits a specific capacitance of 746.2 F/g (areal capacitance of 3.18 F/cm²) at a current density of 1 A/g in 2 mol/L KOH electrolyte. Meanwhile, the Zn-Ni hydroxide electrode also shows a decent long-life cycling stability, retaining 70.9% of the initial capacitance after 3000 charge-discharge cycles.

Key words: znic hydroxide, nickel hydroxide, double hydroxides, Ni foam, supercapacitor

CLC Number:

TQ174

QI Xing-Yao, ZHOU Qing-Feng, CUI Mang-Wei, YANG Yong-Zhen, JIANG Hai-Wei, LIANG Wei, KANG Li-Tao. Capacitive Performance of Zn-Ni Hydroxide Nano-sheet Arrays on Nickel Foams via a Mild Chemical-bath Deposition Process[J]. Journal of Inorganic Materials, 2017, 32(4): 372-378.

Figures/Tables 10

Fig. 1 XRD patterns of acidified Ni foams and Ni@Zn-Ni DHs

Fig. 2 Different magnificent SEM images of the Ni foam substrate

Fig. 3 SEM images of the Ni@Zn-Ni electrode (a), Zn-Ni on the surface of the nickel foam skeletons(b-d), Zn-Ni in the void space of the nickel (foam e-f)

Fig. 4 Nitrogen adsorption/desorption isotherms and pore size distribution (inset) of Ni@Zn-Ni DHs

Fig. 5 (a) Cyclic voltammetric and (b) galvanostatic charge-discharge curves of Ni@Zn-Ni DHs at various scan rates and current densities, (c) GCD curve of acidified Ni foam at current density of 1 A/g

Fig. 6 (a) Areal capacitance and (b) specific capacitance of Ni@Zn-Ni DHs electrodes at different discharge current densities

Fig. 7 Stability test in terms of specific capacitance and galvanostatic charge-discharge curves after every 1000 cycle at a current density of 5 A/g (insert) for Ni@Zn-Ni DHs

Fig. 8 Nyquist plots of Ni@Zn-Ni DHs before and after 3000 charge-discharge cycles in 2 mol/L KOH aqueous electrolyte.

Fig. 9 XRD patterns of Ni@Zn-Ni sample after 3000 charge- discharge cycles

Fig. 10 SEM images of the Ni@Zn-Ni DHs electrode after 3000 charge-discharge cyclesSEM images of Zn-Ni nano-sheets grown on the surface of the Ni foam skeletons (a, b); Zn-Ni nano-sheets accommodated in the voids between skeletons of the Ni foam (c, d)

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