Syntheses and Applications of Nanomaterials for High-performance Supercapacitors

Xiao,  Huang

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アイテム

高性能スーパーキャパシタのためのナノ材料合成とその応用

https://doi.org/10.18997/00007193

名前 / ファイル	ライセンス	アクション
sei_k_327.pdf (6.2 MB)

Item type

学位論文 = Thesis or Dissertation(1)

公開日

2019-06-11

資源タイプ

資源タイプ識別子

http://purl.org/coar/resource_type/c_db06

資源タイプ

doctoral thesis

タイトル

Syntheses and Applications of Nanomaterials for High-performance Supercapacitors

言語

タイトル

高性能スーパーキャパシタのためのナノ材料合成とその応用

言語

eng

著者

Xiao, Huang

抄録

内容記述タイプ

Abstract

内容記述

Supercapacitor, as a new energy storage device, has been widely used in aerospace industry and heavy machinery areas due to the high power density and long cycling life. However, the low energy density limits their widespread application. It is well known that the energy density depends on specific capacitance (Cs) of the electrode and working potential. Therefore, one effective way is to develop nanostructured materials of electrodes for increasing the specific capacitance. The other approach is to fabricate asymmetric supercapacitors, which can effectively broaden the working potential. Hence, we mainly focus on developing electrode materials and assembling asymmetric supercapacitors with high specific capacitance. In chapter 1, the research background is introduced. Supercapacitor structure and its working principle are also described. In order to get an understanding of research progress in materials, the material classification and research progress are also given and concluded. Lastly, the research motivation is proposed based on the previous description. In chapter 2, the equipment and chemicals used in this thesis are listed. The characterization methods and electrochemical measurements are also described. The characterization methods of materials and devices mainly include X-ray powder diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). The cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) and electrochemical impedance spectroscopy (EIS) are the most widely used electrochemical measurements. In chapter 3, Ni3S2/MnS composite with unique 3D morphology was prepared by in-situ hydrothermal method. The Ni3S2/MnS composite shows an enhanced electrochemical performance compared to the single material of Ni3S2 and MnS. The Cs is increased to 6.7 mAh cm-2. Moreover, the Cs remains 97% after 1000 cycles. In chapter 4, in order to improve the electrochemical performance of supercapacitors in terms of flexibility and safety, 1D nanowire WO2.72 with high conductivity (2.58 Ω-1 cm-1) was firstly in-situ grown on carbon cloth (NW WO2.72/CC) by a simple solvothermal reaction. The NW WO2.72/CC electrode shows a high Cs of 398 F g-1 at a current density of 2 A g-1. Furthermore, flexible solid-state asymmetric supercapacitor devices were assembled based on the WO2.72/CC as the positive electrode and activated carbon/carbon cloth (AC/CC) as the negative electrode. The device displays a high energy density of 28 Wh kg-1 at a power density of 745 W kg-1. More impressively, the Cs of the device remains 81% after 10000 cycles. In chapter 5, a novel 2D layered material of Nb2SnC was prepared at relatively low temperature. After etching, the Cs is increased to 128 F g-1 at a scan rate of 2 mV s-1, which is much higher than the pristine sample (25 F g-1). To further improve the electrochemical performance, the etching sample is exfoliated. When the obtained sample was used as an electrode, the Cs has an increase (140 F g-1). Furthermore, symmetric supercapacitors (SSCs) were assembled. The energy density of the device is 14.5 Wh kg-1 within the electrochemical window of 0 V-0.8 V, higher than the energy density (4.4 Wh kg-1) tested within 0 V-0.5 V. In the final chapter, the general conclusions are described. Meanwhile, future prospects are proposed. In this thesis, we synthesized 3 kinds of nanomaterials of the 3D Ni3S2/MnS, 1D NW WO2.72, and 2D Nb2SnC. The electrochemical performance was also investigated. They show great potentials for application of supercapacitors. Future study should focus on the materials development with high conductivity, substrate with high mechanical strength and conductivity, as well as devices with high performance.

言語

内容記述タイプ

TableOfContents

内容記述

1 Introduction||2 Experimental section||3 Novel fabrication of Ni3S2/MnS composite as high performance electrode||4 In-situ growth of nanowire WO2.72 on carbon cloth as a binder-free electrode for flexible asymmetric supercapacitors with high performance||5 Nb2SnC: new kind of nanomaterial synthesis, fabrication and application in supercapacitors

備考

内容記述タイプ

Other

内容記述

九州工業大学博士学位論文学位記番号：生工博甲第327号学位授与年月日：平成30年9月21日

キーワード

主題Scheme

Other

主題

Supercapacitor

キーワード

主題Scheme

Other

主題

energy storage device

キーワード

主題Scheme

Other

主題

flexible solid-state

キーワード

主題Scheme

Other

主題

2D layered material

キーワード

主題Scheme

Other

主題

high conductivity

キーワード

主題Scheme

Other

主題

energy density

アドバイザー

馬, 廷麗

学位授与番号

甲第327号

学位名

博士（工学）

学位授与年月日

2018-09-21

学位授与機関

学位授与機関識別子Scheme

kakenhi

学位授与機関識別子

17104

学位授与機関名

九州工業大学

学位授与年度

内容記述タイプ

Other

内容記述

平成30年度

出版タイプ

VoR

出版タイプResource

http://purl.org/coar/version/c_970fb48d4fbd8a85

アクセス権

open access

アクセス権URI

http://purl.org/coar/access_right/c_abf2

ID登録

10.18997/00007193

ID登録タイプ

JaLC

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高性能スーパーキャパシタのためのナノ材料合成とその応用

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