Publications
Detailed Information
Facile synthesis of Amorphous Carbon-coated NiO Nanofibers for Electrochemical Capacitor Applications
DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | 장 정 식 교수님 | - |
dc.contributor.author | 신동훈 | - |
dc.date.accessioned | 2017-07-17T08:44:35Z | - |
dc.date.available | 2017-07-17T08:44:35Z | - |
dc.date.issued | 2014-02 | - |
dc.identifier.other | 000000016964 | - |
dc.identifier.uri | https://hdl.handle.net/10371/127081 | - |
dc.description | 학위논문 (석사)-- 서울대학교 대학원 : 화학생물공학부, 2014. 2. 장정식. | - |
dc.description.abstract | Amorphous carbon-coated nickel oxide nanofibers (NiC NFs) were fabricated using vapor deposition polymerization (VDP) on electrospun nickel oxide nanofibers (NiO NFs), followed by carbonization. To decorate the surface with amorphous carbon, the NiO NFs starting materials were prepared by electrospinning a PVP solution containing a nickel oxide precursor (NiAc2•4H2O) and calcining the electrospun NFs. Then, polypyrrole (PPy)-coated NiO nanofibers (NiP NFs) were fabricated as intermediate materials using the pyrrole monomer in the VDP method. Finally, carbonization of the NiP NFs converted the PPy into amorphous carbon and thereby formed the NiC NFs. According to X-ray diffraction (XRD) and Barrett–Joyner–Halenda (BJH) analyses, the NiO structure was maintained during the PPy coating and heat-treatment processes. Furthermore, a new pore structure was formed with each fabrication step. The NiC NFs were used as electrochemical capacitors (ECs) with 1 M KOH as the electrolyte. The electrochemical results show that NiC NFs with a thin coating (NiC_L) had a higher specific capacitance (288 F g–1 at 0.3 A g–1) and longer cycle stabilization (89 % capacitance maintained after 3000 cycles) than pristine NiO NFs (221 F g–1 at 0.3 A g–1 | - |
dc.description.abstract | 56 % capacitance maintained after 3000 cycles). Here in, the synthetic methodology is an effective route to obtain hybrid core (inorganic)/shell (organic) nanostructures for electrochemical applications. | - |
dc.description.tableofcontents | Chapter 1. Introduction 1
1.1 Electrochemical Capacitor electrode materials 1 1.1.1 Classification of Electrochemical Capacitors 1 1.1.2 Electrospinning Method 2 1.1.3 Organic/Inorganic Composite Materials 2 1.2 Objective of this study 4 Chapter 2. Experimental 5 2.1 Materials 5 2.2 Fabrication of the Hybrid NiO NFs 6 2.3 Characterization of the Hybrid NiO NFs 7 2.4 Evaluation of the Electrochemical Electrodes 8 Chapter 3. Results and discussion 10 3.1 Fabrication of the Hybrid NiO NFs 10 3.2 Characterization of the Hybrid NiO NFs. 17 3.2.1 X-ray diffraction (XRD) and Raman spectroscopy of the hybrid NiO NFs 17 3.2.2 X-ray photoelectron spectroscopy (XPS) of the hybrid NiO NFs 20 3.3.3 BET and BJH measurements of the hybrid NiO NFs 23 3.3 Electrochemical capacitance of the hybrid NiO NFs. 27 3.3.1 Electrochemical performance of the hybrid NiO NFs 27 3.3.2 Specific capacitance of the hybrid NiO NFs with various current density and scan rate 34 3.3.3 Long-term cycling performance of the hybrid NiO NFs 39 3.3.4 Electrochemical Impedance Spectroscopy of the hybrid NiO NFs 42 Chapter 4. Conclusion 44 References 46 국문초록 51 | - |
dc.format | application/pdf | - |
dc.format.extent | 2520960 bytes | - |
dc.format.medium | application/pdf | - |
dc.language.iso | en | - |
dc.publisher | 서울대학교 대학원 | - |
dc.subject | nickel oxide | - |
dc.subject | amorphous carbon | - |
dc.subject.ddc | 660 | - |
dc.title | Facile synthesis of Amorphous Carbon-coated NiO Nanofibers for Electrochemical Capacitor Applications | - |
dc.type | Thesis | - |
dc.description.degree | Master | - |
dc.citation.pages | xi, 51 | - |
dc.contributor.affiliation | 공과대학 화학생물공학부 | - |
dc.date.awarded | 2014-02 | - |
- Appears in Collections:
- Files in This Item:
Item View & Download Count
Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.