NiAl、CoAl与NiCoAl氢氧化物的结构和电化学性能比较

doi:10.15541/jim20160099

摘要/Abstract

摘要：

采用尿素分解法制备了NiAl、CoAl及NiCoAl三种氢氧化物。经XRD、FT-IR、SEM、XPS和N₂吸脱附等方法对样品进行结构和形貌表征, 结果表明: 三种材料都为类水滑石结构, 形貌各不相同, NiCoAl氢氧化物的比表面积最小, 其中Ni和Co元素都以二价的形式存在。通过循环伏安(CV)、恒电流充放电 (GCD)、交流阻抗对样品的电化学性能进行评估, 结果表明: 电流密度为0.6 A/g时, NiAl、CoAl、NiCoAl电极的比电容分别为468、507、929 F/g, 电流密度为6 A/g, 经3000次恒电流充放电测试后, 三种电极比电容的保持率分别为30%、36%、40%。这说明, NiCoAl氢氧化物具有优于其它两种材料的电化学性能。

关键词: 氢氧化物, 镍, 钴, 铝

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

中图分类号:

TQ174

康桂英, 陈泳, 李娟娟. NiAl、CoAl与NiCoAl氢氧化物的结构和电化学性能比较[J]. 无机材料学报, 2016, 31(11): 1230-1236.

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.

图/表 7

图1 样品的XRD (a)和FT-IR(b)图谱

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

图2 CoAl-LDH (a)、NiAl-LDH (b); NiCoAl-LDH (c)样品的SEM照片

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

图3 N2吸脱附等温线NiCoAl-LDH (a)、NiAl-LDH (b)和CoAl-LDH (c)及其相应的孔径分布图

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

图4 NiCoAl-LDH的XPS光谱图

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

图5 样品的电化学性能测试

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

图6 模拟等效电路图

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

表1 等效电路的模拟数据

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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