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研究生：	白達拉 BANDARLA VINY KUMAR
論文名稱：	退火溫度下對ZnCo2O4奈米片和碳紙的誘導超電容性能 Induced Supercapacitor Performance of ZnCo2O4 Nanosheets on Carbon Paper by Annealing Temperature
指導教授：	蘇彥勳 Su,Yen-Hsun
學位類別：	碩士 Master
系所名稱：	工學院 - 材料科學及工程學系 Department of Materials Science and Engineering
論文出版年：	2022
畢業學年度：	110
語文別：	英文
論文頁數：	52
中文關鍵詞：	水熱法製程、ZnCo2O4奈米片狀、碳紙、輕質超級電容
外文關鍵詞：	Hydrothermal process, ZnCo2O4 nanosheets, carbon paper, lightweight supercapacitors
相關次數：	點閱：40 下載：2
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透過簡單的水熱法製程、滴落塗佈法在不同的退火溫度下可以成功的製備出ZnCo2O4 奈米片狀的網絡結構。在不同退火溫度下對於ZnCo2O4的晶體結構、表面形貌和電化學特性都有顯著的影響。研究結果顯示出，退火溫度為300度的ZnCo2O4電極在電流密度為3A/g下有171F/g的超高比電容。使用正極的ZnCo2O4-300 ºC和負極的AC在碳紙上成功製備出一種輕質、小型非對稱超級電容器(ASC)元件，在功率密度為126 W/kg下可表現出優異的能量密度1.33 Wh/kg和在電流密度為10A/g經過1000次循環測試下可以表現出90%的電容保持率和庫倫效率100%的優秀長期穩定性。

關鍵字: 水熱法製程、ZnCo2O4奈米片狀、碳紙、輕質超級電容

The network structure of ZnCo2O4 nanosheets are successfully achieved by a simple hydrothermal process, drop casting method, and adjusting the annealing temperature. It came to know that the crystal structure, morphology, and electrochemical performance of ZnCo2O4 nanosheets are significantly influenced by different annealing temperatures. It has been discovered that the electrode of ZnCo2O4 nanosheets that had been annealed at 300 °C shows an ultrahigh specific capacitance of about 171 F/g at a current density of 3 A/g. A lightweight and small asymmetric supercapacitor (ASC) device was successfully fabricated using the ZnCo2O4 -300 o C and AC as positive and negative electrodes on carbon paper, which showed an excellent energy density of 1.33 Wh/kg at a power density of 126 W kg−1, it reattained 90% capacitance retention and 100% coulombic efficiency over 1,000 cycles at a current density of 10 A/g superior cycle stability for supercapacitor application.

Keywords: Hydrothermal process, ZnCo2O4 nanosheets, carbon paper, and lightweight supercapacitors.

摘要….……………………………………………………………………............................................................i
Abstract….…………………………………………………………….............................................................ii
Acknowledgment……………………………………………………….....................................................iii
Content ………………………………………………………………..............................................................iv
List of Tables …………………………………………………......................................................................vi
List of Figures ………………………………………………………….........................................................vii    
Chapter 1 Introduction…………………………………………………....................................................1 
 1.1. Preface.…………………………………………………………...............................................................1
 1.2. Research objectives and motivation……………………………….........................................3
Chapter 2 Theoretical Background……………………………………...............................................4
 2.1 Background of SCs……………………………………......................................................................4
 2.2 Energy storage principles of SCs………………………............................................................5
 2.3 ZnCo2O4 as an electrode material…………………………………….......................................6
 2.4 Carbon paper as a current collector………………………………….........................................7
 2.5 Potassium hydroxide (KOH) as an electrolyte………………………....................................7
Chapter 3 Experimental Section……………………………………….................................................8
 3.1 Materials…………………………………………………………...............................................................8
 3.2 Sample preparation……………………………………………..........................................................8
3.2.1 Hydrothermal synthesis of  ZnCo2O4 nanosheets at different 
 .             annealing temperatures…………………………………………..............................................8
       3.2.2 Drop casting of ZnCo2O4  nanosheets on carbon paper ……...........................9
       3.2.3 Fabrication of negative electrode of activated carbon (AC)…….......................9
       3.2.4 Assemble of ZnCo2O4 -300 oC //AC ASC device……………….............................9
 3.3 Material Characterization………………………………………….................................................10
       3.3.1 X-ray diffraction (XRD)  …………………………………….................................................10
       3.3.2 X-ray photoelectron spectroscopy (XPS)…………………….....................................10
       3.3.3 Scanning electron microscopic (SEM)  ……………………….....................................10
       3.3.4 Transmission electron microscopic (TEM)……….…………......................................10 
       3.3.5 Electrochemical characterization …………………………............................................10
Chapter 4 Results and Discussion…………………………………….................................................13
 4.1 Characterization of structure and morphology of ZnCo2(OH)6 and ZnCo2O4 nanosheets at different annealing temperatures….………....................................................13
 4.2 Electrochemical performance of ZnCo2(OH)6, and ZnCo2O4eelectrode on carbon paper…………………………………………………….....................................................................25
 4.3 Electrochemical performance of activated carbon (AC) …..……….............................39
 4.4 Electrochemical performance of the asymmetric supercapacitor (ASC) device by two electrode system……………………….……………................................................................41
Chapter 5 Conclusion………………………………………………........................................................46
References… ………………………………………………………….............................................................47
                                    

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