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Title Page
Contents
Chapter 1. Introduction 11
Chapter 2. Electrodeposited Transition metal compounds for Oxygen Evolution Reaction 12
2.1. Introduction 13
2.2. Experimental 15
2.2.1. Materials 15
2.2.2. Potentiostatic deposition of CNSe, FeOOH, and bilayer CNSe/FeOOH Thin film 15
2.2.3. Materials characterization 16
2.2.4. Electrochemical charaterization 17
2.3. Results and Discussion 17
2.3.1. Physical characteristics 17
2.3.2. Electrochemical characteristics 30
2.4. Conclusions 46
Bibliography 47
Curriculum Vitae 56
요약 58
Figure 2.1. Schematic illustration of the electrodeposition of the CNSe/FeOOH bilayer thin film 19
Figure 2.2. Schematic diagram illustrating the potentiostatic deposition of CoNi2Se4 (CNSe), FeOOH and CNSe/FeOOH electrodes on the Ni-Foam substrate 20
Figure 2.3. Low- and high-resolution FE-SEM images of (a1, a2) CNSe, (b1, b2) FeOOH, and (c1, c2) CNSe/FeOOH thin films. (d, e) Electron image and the corresponding EDS... 22
Figure 2.4. TEM, HRTEM, and SAED images of (a-c) CNSE, (d-f) FeOOH and (g-j) CNSe/FeOOH thin films 25
Figure 2.5. XRD patterns of CNSe, FeOOH, and CNSe/FeOOH thin films 26
Figure 2.6. (a) XPS survey scan spectrum of CNSe/FeOOH bilayer thin film and (b-f) high-resolution XPS spectra of Co 2p, Ni 2p, Se 3d, Fe 2p, and O 1s 29
Figure 2.7. Electrocatalytic OER performance of CNSe, FeOOH, and CNSe/FeOOH. b) Polarization curves of catalysts for OER 31
Figure 2.8. Overpotential at a current density of 10 mA cm-2[이미지참조] 32
Figure 2.9. Corresponding Tafel plots 34
Figure 2.10. Cyclic voltammetry curves of (a) CNSe, (b) FeOOH, and (c) CNSe/FeOOH electrocatalysts in the non-Faradaic region at different scan rates from 100 to 500mV s-1[이미지참조] 37
Figure 2.11. Plots of current density versus the scan rate 38
Figure 2.12. Nyquist plots obtained by EIS at 1.557 V vs. RHE 39
Figure 2.13. Electrocatalytic OER performance: (a) chronopotentiometry stability curve of CNSe/FeOOH, (b) multicurrent chronopotentiometry of CNSe/FeOOH 42
Figure 2.14. Plot of current density Vs. the scan rate 43
Figure 2.15. Nyquist plots obtained by EIS at 1.553V vs. RHE after stability 44
Figure 2.16. SEM images of the CNSe/FeOOH electrocatalyst (a,b) before chronopotentiometry stability and (c,d) after chronopotentiometry stability 45
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