Comparison on Structure and Electrochemical Performances of NiAl-LDH, CoAl-LDH and NiCoAl-LDH

doi:10.15541/jim20160099

Abstract

Abstract:

NiAl, CoAl and NiCoAl hydroxides were fabricated via urea decomposition method. The structure and morphology of samples were characterized by X-Ray diffraction, FTIR, scanning electron microscope, X-ray photoelectron spectroscope, and nitrogen adsorption desorption. The results indicate that three samples exhibit hydrotalcite structure and different morphology. Specific surface area of NiCoAl is the smallest among the three samples. Ni and Co elements coexist in the form of bivalent in NiCoAl-LDH. Cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and AC impedance tests demonstrate that, at the current density of 0.6 A/g, specific capacitance of NiAl, CoAl and NiCoAl electrodes is 468, 507 and 929 F/g, respectively. The capacitance retention of their electrodes is 30%, 36% and 40%, respectively, after 3000 cycles at the current density of 6 A/g. Based on these properties, NiCoAl is superior in electrochemical performance to the others.

Key words: hydroxides, nickel, cobalt, aluminum

CLC Number:

TQ174

KANG Gui-Ying, CHEN Yong, LI Juan-Juan. Comparison on Structure and Electrochemical Performances of NiAl-LDH, CoAl-LDH and NiCoAl-LDH[J]. Journal of Inorganic Materials, 2016, 31(11): 1230-1236.

Figures/Tables 7

Fig. 1 XRD patterns (a) and FT-IR spectra (b) of samples

Fig. 2 SEM images of CoAl-LDH (a), NiAl-LDH (b) and NiCoAl-LDH (c)

Fig. 3 Nitrogen adsorption desorption isotherms of NiCoAl-LDH (a), NiAl-LDH (b) and CoAl-LDH (c), and their corresponding pore size distribution curve in inset

Fig. 4 XPS spectra of NiCoAl-LDH(a) Survey scan; (b) Ni2p spectrum; (c) Co2p spectrum

Fig. 5 Electro-chemical properties of the sample(a) CV curves of samples at a scan rate of 5 mV/s; (b) GCD curves of samples at a current density of 0.6 A/g; (c) AC impedance plots of samples at open circuit voltage; (d) Charge-discharge cycling test of samples electrode at the current density of 6 A/g

Fig. 6 Equivalent circuits for the simulation of EIS spectra of NiAl-LDH (a), CoAl-LDH (b) and NiCoAl-LDH (c)

Table 1 Simulation data of equivalent circuit

	NiAl-LDH	CoAl-LDH	NiCoAl-LDH
Rs	0.80	0.80	0.80
Rp	0.64	0.22	0.18

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