表面活性剂对NiCo2S4纳米薄膜的电化学性能影响的研究

doi:10.15541/jim20170181

摘要/Abstract

摘要：

通过水热法在泡沫镍上成功制备了纳米结构的NiCo₂S₄薄膜, 主要包括前驱体制备及硫化过程。研究表明, 制备过程中添加不同种类的表面活性剂会对NiCo₂S₄薄膜的形貌、结构和电化学性能产生影响。添加表面活性剂后, NiCo₂S₄会自组装逐渐形成三维纳米片网状结构。在所有的NiCo₂S₄薄膜中, 添加SDS表面活性剂的薄膜表现出最高的比电容(在0.5 A/g电流密度下达到2893 F/g)、出色的倍率特性(在10 A/g电流密度下达到1890.6 F/g)和良好的循环稳定性(1000次循环后保持率为96.1%)。研究结果表明纳米网状的NiCo₂S₄是一种极具潜力的超级电容器电极材料。

关键词: 纳米结构NiCo₂S₄, 表面活性剂, 水热法, 电化学性能

Abstract:

Nanostructured NiCo₂S₄ films on Ni foams were successfully synthesized through a facile method, involving hydrothermal growth of NiCo-precursor and subsequent sulfidation process of NiCo₂S₄. The influence of different surfactants were investigated, including morphology, phase structure and electrochemical performance of NiCo₂S₄ electrodes. With the addition of surfactants during the hydrothermal processes, the nanostructured NiCo₂S₄ self-organized and agglomerated into nanosheets, showing outstanding influence on the morphology by the surfactants. Among these electrodes, the NiCo₂S₄ electrode modified with SDS exhibited an optimal capacitance of 2893 F/g at 0.5 A/g, a superior rate capability of 1890.6 F/g even at 10 A/g, and good cycling stability of 96.1% over 1000 cycles. These results indicate that nanosheet NiCo₂S₄ would be promising electrode materials for supercapacitor applications.

Key words: nanostructured NiCo₂S₄, surfactants, hydrothermal, electrochemical performance

中图分类号:

TQ174

张国雄, 陈月梅, 何臻妮, 林川, 陈益钢, 郭海波. 表面活性剂对NiCo₂S₄纳米薄膜的电化学性能影响的研究[J]. 无机材料学报, 2018, 33(3): 289-294.

ZHANG Guo-Xiong, CHEN Yue-Mei, HE Zhen-Ni, LIN Chuan, CHEN Yi-Gang, GUO Hai-Bo. Surfactant Dependence of Nanostructured NiCo₂S₄ Films on Ni Foam for Superior Electrochemical Performance[J]. Journal of Inorganic Materials, 2018, 33(3): 289-294.

图/表 7

图1 不同样品的XRD图谱

Fig. 1 XRD patterns of different specimens(a) NiCo2S4-pure; (b) NiCo2S4-SDS; (c) NiCo2S4-PEG; (d) NiCo2S4-CTAB

图2 不同NiCo2S4及其前驱体的SEM照片

Fig. 2 FESEM images of different NiCo2S4 and precusors(a) NiCo2S4-pure; (b) NiCo2S4-CTAB; (c) NiCo2S4-PEG; (d) NiCo2S4-SDS

图3 不同NiCo2S4样品的TEM照片

Fig. 3 TEM images of different NiCo2S4(a) NiCo2S4-pure; (b) NiCo2S4-CTAB; (c) NiCo2S4-PEG; (d) NiCo2S4-SDS; (e) SAED patterns; (f) HRTEM image of NiCo2S4-SDS

图4 NiCo2S4-SDS样品的等温吸脱附曲线及平均孔径分布

Fig. 4 Nitrogen adsorption/desorption isotherm of the NiCo2S4-SDS specimens with inset showing the corresponding pore size distributions

表1 添加不同表面活性剂的NiCo2S4样品的比表面积、平均孔径及在1 A/g电流下的比电容

Table 1 Specific surface area, average pore size and specific capacitance at current density of 1 A/g of different NiCo2S4 electrodes

Electrode	Specific surface area/(m²•g^-1)	Average pore size/nm	Specific capacitance/(F•g^-1)
NiCo₂S₄-pure	33.3	12.8	1056.7
NiCo₂S₄-CTAB	27.3	26.5	983.3
NiCo₂S₄-PEG	39.2	12.4	2155.5
NiCo₂S₄-SDS	53.3	14.7	2635.9

图5 不同NiCo2S4样品的电化学性能测试

Fig. 5 Electrochemical properties of different NiCo2S4(a) CV curves at 5 mV/s; (b) Discharge curves at 0.5 A/g; (c) CV curves of NiCo2S4-SDS electrodes at 2 mV/s and 5-20 mV/s (insert); (d) Charge-discharge curves of NiCo2S4-SDS electrodes at 0.75-20 A/g

图6 不同NiCo2S4样品的电化学性能测试

Fig. 6 Electrochemical properties of different NiCo2S4(a) The specific capacitance of NiCo2S4 electrodes at different current densities; (b) EIS of NiCo2S4 electrodes; (c) Cycling performance of NiCo2S4 electrodes at 5 A/g

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表面活性剂对NiCo₂S₄纳米薄膜的电化学性能影响的研究

Surfactant Dependence of Nanostructured NiCo₂S₄ Films on Ni Foam for Superior Electrochemical Performance

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