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표제지 2

목차 5

Abstract 10

Ⅰ. 서론 12

1. 연구 배경 및 목적 12

Ⅱ. 이론 16

1. 물분해 16

1.1. 전기화학적 물 분해 (Electrochemical water splitting) 16

1.2. 수소발생반응 (Hydrogen evolution reaction, HER) 18

2. 전기 촉매 합성법 20

2.1. 양극산화 (Anodization) 20

2.2. 전착 (Electrodeposition) 21

Ⅲ. 실험 방법 23

1. 수전해용 Ni-rich 양극산화 전극 제조 23

1.1. Anodized stainless steel (ASS) 전극 23

1.2. Ni-rich Anodized stainless steel (Ni-ASS) 전극 24

2. 물리적 특성 분석 27

3. 전기화학적 분석 (LSV, Tafel plot, EIS, CA, GC) 28

Ⅳ. 실험 결과 및 고찰 31

1. 구조 및 형태 분석 (SEM, TEM, EDS) 31

2. 촉매 성능 평가 (LSV) 38

3. 결정 구조 분석 (XRD) 44

4. 화학적 결합 분석 (XPS) 46

5. 반응 전해질 분석 (ICP-MS) 51

6. 반응 메커니즘 분석 (EIS) 53

7. 수소 발생 반응 (HER) 평가 (Tafel plot, GC) 55

8. 안정성 (Stability) 평가 (CA) 58

Ⅴ. 결론 60

Ⅵ. 참고문헌 61

표목차 9

Table 1. Quantitative analysis of the electrode surface chemical... 36

Table 2. ICP Analysis of Ni and Fe concentration in electrolyte... 52

그림목차 7

Figure 1. Schematic illustration for the mechanism of anodization... 26

Figure 2. (a) FE-SEM and EDS images of SS, (b) ASS, Ni-ASS... 34

Figure 3. (a) FE-SEM and EDS images of Ni-ASS prepared by... 35

Figure 4. Cross-sectional TEM-EDS line scanning profiles and... 37

Figure 5. LSV curves for HER of (a) potenial effect, (b) HER... 42

Figure 6. SEM-EDS mapping images of Ni-ASS-1500... 43

Figure 7. XRD patterns of SS, ASS and Ni-ASS-9000 45

Figure 8. XPS spectra of SS, ASS, Ni-ASS-9000: survey (a) Ni... 49

Figure 9. Schematic illutstration for the mechanism of the porous... 50

Figure 10. EIS diagram of SS, ASS, Ni-ASS-1500, Ni-ASS-... 54

Figure 11. Tafel plots of various electrocatalysts showing (a)... 56

Figure 12. (a) Chronoamperometric curves of Ni-ASS-9000, (b)... 57

Figure 13. Stability test of Ni-ASS: (a) potential effect, (b)... 59

초록보기

 Hydrogen energy is a sustainable alternative to fossil fuels, with electrochemical water splitting using renewable sources emerging as an eco-friendly method of H₂ production while reducing CO₂ emissions. Stainless steel, valued for its durability and affordability, serves as an ideal electrode material for scaling up and commercializing electrochemical water-splitting systems, acting as conductive substrate for electrocatalysts. Stainless steel is a representative alloy material containing transition metal elements such as Fe, Cr, Ni and particularly the Fe and Ni alloys are known as electrocatalysts for water electrolysis. However, the intrinsic electrocatalytic activity of stainless steel is low due to its inactive surface and lack of active sites. Therefore, this thesis deals with the modification of surface to improve the electrochemical performance.

The research involves anodizing stainless steel to leach out Fe and Ni ions, then redepositing the Ni onto the electrode surface using the solution obtained directly from the anodizing reaction without external Ni supplementation. By redepositing the dissolved Ni ions, a Ni-rich surface is formed that significantly enhances the electrocatalytic activity for hydrogen evolution during water electrolysis. Recycling the anodizing solution allows for the utilization of Ni sourced from the stainless steel itself, thereby improving the catalyst's performance from both economic and environmental perspectives.

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