Carbon and metal oxides based nanomaterials for flexible high performance asymmetric supercapacitors
This thesis examines electrode materials such as mesoporous carbons, manganese oxides, iron oxides and their nanohybrids with graphene. It also explores several of the key scientific issues that act as the governing principles for future development of supercapacitors, which are a promising class of...
| Main Author: | Hu, Yating, 1971- |
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| Other Authors: | SpringerLink (Online service) |
| Format: | eBook |
| Language: | English |
| Published: |
Singapore :
Springer,
2018.
|
| Physical Description: |
1 online resource (xxiv, 108 pages) : illustrations (some color). |
| Series: |
Springer theses.
|
| Subjects: |
| Summary: |
This thesis examines electrode materials such as mesoporous carbons, manganese oxides, iron oxides and their nanohybrids with graphene. It also explores several of the key scientific issues that act as the governing principles for future development of supercapacitors, which are a promising class of high-efficiency energy storage devices for tackling a key aspect of the energy crisis. However, critical technical issues, such as the low energy density and reliability, need to be addressed before they can be extended to a wide range of applications with much improved performance. Currently available material candidates for the electrodes all have their disadvantages, such as a low specific capacitance or poor conductivity for transition metal oxide/hydroxide-based materials. This thesis addresses these important issues, and develops a high-performance, flexible asymmetric supercapacitor with manganese oxides/reduced graphene oxide as the positive electrode and iron oxide/reduced graphene oxide as the anode, which delivers a high energy density of 0.056 Wh cm-3. |
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| Item Description: |
"Doctoral thesis accepted by the National University of Singapore, Singapore." Includes bibliographical references. Intro; Supervisor's Foreword; Parts of this thesis have been published in the following journal articles:Y. Hu, H. Liu, Q. Ke and J. Wang, "Effects of nitrogen doping on supercapacitor performance of a mesoporous carbon electrode produced by a hydrothermal soft-templating process". Journal of Materials Chemistry A, 2 (2014) 11753-11758.Y. Hu and J. Wang, "MnOx nanosheets for improved electrochemical performances through bilayer nano-architecting". Journal of Power Sources, 286 (2015) 394-399.Y. Hu, C. Guan, G. Feng and J. Wa; Acknowledgements; Contents; List of Figures; List of Tables. Symbols1 Introduction; 1.1 Brief Overview of Supercapacitors; 1.2 What Makes a Good Supercapacitor Electrode Material; 1.3 Recent Advances and Challenges; 1.3.1 Advantages of Supercapacitors; 1.3.2 Challenges of Supercapacitors; 1.3.3 Asymmetric Supercapacitors; 1.3.4 Flexible Supercapacitors; 1.4 Electrode Materials for Supercapacitors; 1.4.1 Carbon Materials; 1.4.1.1 Activated Carbons (ACs); 1.4.1.2 Graphene; 1.4.1.3 Templated Mesoporous Carbon Materials (MCMs); 1.4.2 Conducting Polymers; 1.4.2.1 Polyaniline; 1.4.2.2 Polypyrrole; 1.4.3 Transition Metal Oxides and Their Hybrids. 1.4.3.1 Manganese Oxides1.4.3.2 Manganese Oxides and Carbon-Based Hybrids; 1.4.3.3 Ruthenium Oxides; 1.4.3.4 Nickel Oxide/Hydroxide; 1.4.3.5 Iron Oxides; 1.5 Project Motivations and Designs; 1.6 Research Objectives; References; 2 Experimental Section; 2.1 Materials; 2.2 Materials Synthesis; 2.3 Characterizations; 2.3.1 Chemical and Composition Analysis; 2.3.2 Morphological Studies; 2.3.3 Electrochemical Measurements; 3 Nitrogen Doping of Mesoporous Carbon Materials; 3.1 Introduction; 3.2 Synthesis Methods; 3.3 Results and Discussion. 3.3.1 Microstructure and Chemical Composition Characterizations3.3.2 Electrochemical Characterizations; 3.4 Remarks; References; 4 Improving the Surface Area and Loading Mass of MnOx Based Electrode Materials; 4.1 Introduction; 4.2 Synthesis Methods and Electrochemical Characterizations; 4.3 Results and Discussion; 4.3.1 Characterizations of the First Layer of MnO2 Nanosheet; 4.3.2 Bilayer Integration and Characterizations; 4.4 Remarks; References; 5 Mn3O4 Nanomaterials with Controllable Morphology and Particle Sizes; 5.1 Introduction; 5.2 Synthesis Methods; 5.3 Results and Discussions. 5.3.1 Temperature of Hydrothermal Growth5.3.2 Tuning of Particle Sizes Through CTAB; 5.3.3 Electrochemical Characterization of Mn3O4 Nanoparticles/rGO Hybrid; 5.4 Remarks; References; 6 Optimized Hybrid Mn3O4 Nanofiber/rGO Paper for High Performance Flexible ASCs; 6.1 Introduction; 6.2 Synthesis Methods; 6.3 Results and Discussion; 6.3.1 Electrochemical Reduction of Hybrid Mn3O4/GO Papers; 6.3.2 Characterizations of the MG Papers; 6.3.3 Electrochemical Performance of MG//rGO ASCs; 6.3.3.1 Using Aqueous Electrolyte; 6.3.3.2 Using Ionic Liquid Electrolyte; 6.4 Remarks; References. This thesis examines electrode materials such as mesoporous carbons, manganese oxides, iron oxides and their nanohybrids with graphene. It also explores several of the key scientific issues that act as the governing principles for future development of supercapacitors, which are a promising class of high-efficiency energy storage devices for tackling a key aspect of the energy crisis. However, critical technical issues, such as the low energy density and reliability, need to be addressed before they can be extended to a wide range of applications with much improved performance. Currently available material candidates for the electrodes all have their disadvantages, such as a low specific capacitance or poor conductivity for transition metal oxide/hydroxide-based materials. This thesis addresses these important issues, and develops a high-performance, flexible asymmetric supercapacitor with manganese oxides/reduced graphene oxide as the positive electrode and iron oxide/reduced graphene oxide as the anode, which delivers a high energy density of 0.056 Wh cm-3. |
| Physical Description: |
1 online resource (xxiv, 108 pages) : illustrations (some color). |
| Bibliography: |
Includes bibliographical references. |
| ISBN: |
9789811083426 9811083428 |
| ISSN: |
2190-5053. |