類松果狀NiMoO<sub>4</sub>/MnO<sub>2</sub>復合材料的合成及超級電容性能

張勇; 常翠榮; 王詩文; 高海麗; 閆繼; 賈曉東; 羅河偉; 高可政; 張愛勤

doi:10.13374/j.issn2095-9389.2019.05.011

類松果狀NiMoO₄/MnO₂復合材料的合成及超級電容性能

doi: 10.13374/j.issn2095-9389.2019.05.011

張勇^{1, 2, ,},
常翠榮¹,
王詩文¹,
高海麗¹,
閆繼¹,
賈曉東¹,
羅河偉¹,
高可政¹,
張愛勤¹

1.
鄭州輕工業大學材料與化學工程學院, 鄭州 450002
2.
河南省表界面科學重點實驗室, 鄭州 450002

基金項目:

國家自然科學基金資助項目 21503193

河南省高校科技創新團隊支持計劃資助項目 16IRTSTHN016

詳細信息

通訊作者:
張勇, E-mail: zy@zzuli.edu.cn

中圖分類號: TM533
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- 文章訪問數: 1039
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- 被引次數: 0
出版歷程
- 收稿日期: 2018-05-17
- 刊出日期: 2019-05-01

Preparation and supercapacitive performance of pinecone-like NiMoO₄/MnO₂ composite material

1.
Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China
2.
Henan Provincial Key Laboratory of Surfaceand Interface Science and Technolog, Zhengzhou 450002, China

More Information

Corresponding author: ZHANG Yong, E-mail: zy@zzuli.edu.cn

摘要

摘要: 以Na₂MoO₄·2H₂O、NiSO₄·6H₂O和MnO₂為原料, 采用水熱法成功制備了類松果狀NiMoO₄/MnO₂復合材料.通過X射線衍射、掃描電子顯微鏡、恒電流充放電、循環伏安和交流阻抗對材料進行表征.結果表明, MnO₂的最佳質量分數為10%, 所得NiMoO₄/MnO₂復合材料具有類松果狀形貌, 其顆粒直徑為200~600 nm, 且表面粗糙、多孔; 在1 A·g^-1的電流密度下, MnO₂質量分數為0、5%、10%、15%、20%時, 所得復合材料NM0、NM5、NM10、NM15和NM20的放電比電容分別為260、248、650、420和305 F·g^-1.在電流密度為10 A·g^-1下, 最佳樣品NM10復合材料的首次放電比容量為102 F·g^-1, 經過100次循環后, 其放電比電容穩定在147 F·g^-1.該性能的提高, 主要是由于MnO₂的引入彌補了NiMoO₄單一材料存在的不足, 從而達到協同增效的作用.
- 復合材料 /
- 類松果狀 /
- NiMoO₄/MnO₂ /
- 水熱法 /
- 比電容
Abstract: Supercapacitors, also called electrochemical capacitors or ultracapacitors, have attracted increasing attention owing to their high specific capacitance, high power density, long lifecycle, fast charge-discharge ability, wide working temperature range, and environmental friendliness for mobile electronics, power grids, and hybrid electric vehicles. The electrode is the most important part of supercapacitors; therefore, the electrode material is the chief factor that determines the properties of supercapacitors. To enhance the performance of a supercapacitor, particularly its specific energy while retaining its intrinsic high specific power, several researchers have focused mainly on improving the properties of electrode materials. The major classes of materials applied for supercapacitors include various forms of carbon, transition metal oxides, and conductive polymers. Compared to the carbon materials and conducting polymer materials, transition metal oxides can achieve a much higher specific capacitance because of their high theoretical capacitance, well-defined electrochemical redox activity, low cost, and abundant resources. In particular, binary metal oxides, such as NiMoO₄, MnMoO₄, and CoMoO₄, have been extensively studied as pseudocapacitor electrode materials because of their good electronic conductivity and rich redox reactions. In this study, pinecone-like NiMoO₄/MnO₂ composite materials were successfully synthesized using a facile hydrothermal method. Na₂MoO₄·2H₂O, NiSO₄·6H₂O, and MnO₂ were used as raw materials. The as-products were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), galvanostatic charge-discharge, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The results show that when the optimal content of MnO₂ reaches 10%, the obtained NiMoO₄/MnO₂ composite materials exhibits a pinecone-like porous morphology, with the particle size ranging from 200 to 600 nm. The results show that NiMoO₄/MnO₂ composite materials have excellent electrochemical properties. The discharge specific capacitance of NM0, NM5, NM10, NM15, and NM20 composites with corresponding MnO₂ contents of 0%, 5%, 10%, 15%, and 20% are 260, 248, 650, 420, and 305 F·g^-1, respectively, at a current density of 1 A·g^-1. When the current density is up to 10 A·g^-1, the initial discharge specific capacitance is 102 F·g^-1. After 100-week cycles, the discharge specific capacitance of the NM10 sample is still 147 F·g^-1. The improvements can be mainly attributed to the introduction of MnO₂ in the NiMoO₄/MnO₂ composite materials to overcome the shortcomings of single NiMoO₄.
- composite material /
- pinecone-like /
- NiMoO₄/MnO₂ /
- hydrothermal method /
- specific capacities

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圖 1 NM10復合材料樣品的X射線衍射圖譜

Figure 1. XRD patterns of the NM10 composite sample

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圖 2 NM10復合材料樣品的掃描電鏡照片. (a) 低倍; (b) 高倍

Figure 2. SEM images of the NM10 composite sample: (a) low magnification; (b) high magnification

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圖 3 不同MnO₂含量下NiMoO₄/MnO₂復合材料在1 A·g^-1下的恒流充放電曲線

Figure 3. Galvanostatic charge-discharge curves of NiMoO₄/MnO₂ composite materials with different MnO₂ contents at 1 A·g^-1

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圖 4 NM10復合材料在10 A·g^-1下的循環性能曲線

Figure 4. Charge-discharge cycle performance curves of the NM10 composite sample at 10 A·g^-1

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圖 5 不同MnO₂含量下NiMoO₄/MnO₂復合材料在不同掃速下的循環伏安曲線

Figure 5. Cyclic voltammetry curves of NiMoO₄/MnO₂ composite materials with different MnO₂ contents at different scan rates

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圖 6 不同MnO₂含量下NiMoO₄/MnO₂復合材料的交流阻抗譜圖

Figure 6. EIS spectra of NiMoO₄/MnO₂ composites with different MnO₂ contents

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