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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 김영호
- 발행연도
- 2019
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The uses of fossil fuels has raised concerns about resource depletion and environmental pollution. Since hydrogen energy does not emit carbon, it can minimize environmental pollution and there is no worry of depletion due to abundant water. Among the various methods of electrolytic electrolysis, alkaline electrolysis is technically stable and inexpensive.
The overall efficiency depend on the overpotential of the oxygen evolution reaction in alkaline water electrolysis. Therefore, it is necessary to research to reduce the oxygen evolution overpotential of electrodes.
In this study, Ni-Zn-Fe electrodes were prepared by electroplating and the surface area was increased by Zn leaching process. Also, The effects of plating variables were studied to optimize plating variables(electroplating current density, pH value of electroplating solution, Ni/Fe content ratio). Ni-Zn-Fe electrode showed 0.294 V of overpotential at 0.1 A/cm^2. That result is better than that of Ni and Ni-Zn plated electrodes. As the electroplating current density of the Ni-Zn-Fe electrode increased, the particle size tended to increase and the overpotential of oxygen evolution reaction decreased. In addition reducing pH of electroplating solution from 4 to 2, Fe content in electrode and activity of oxygen evolution reaction decreased.
The overall efficiency depend on the overpotential of the oxygen evolution reaction in alkaline water electrolysis. Therefore, it is necessary to research to reduce the oxygen evolution overpotential of electrodes.
In this study, Ni-Zn-Fe electrodes were prepared by electroplating and the surface area was increased by Zn leaching process. Also, The effects of plating variables were studied to optimize plating variables(electroplating current density, pH value of electroplating solution, Ni/Fe content ratio). Ni-Zn-Fe electrode showed 0.294 V of overpotential at 0.1 A/cm^2. That result is better than that of Ni and Ni-Zn plated electrodes. As the electroplating current density of the Ni-Zn-Fe electrode increased, the particle size tended to increase and the overpotential of oxygen evolution reaction decreased. In addition reducing pH of electroplating solution from 4 to 2, Fe content in electrode and activity of oxygen evolution reaction decreased.
목차
Ⅰ. 서 론 1Ⅱ. 이론적 배경 42.1. 알칼라인 수전해 42.1.1 산소발생반응 72.2.2. 수소발생반응 102.2.전기 도금 122.3. Watts bath 162.4. Raney nickel 162.5. Anomalous deposition 192.6. Hull cell 실험 212.7. 전기화학적 분석법 252.7.1. 선형주사전위법 252.7.2. 순환전압전류법 262.7.3. 타펠 도시 26Ⅲ. 실 험 313.1. Hull cell 제조 313.2. 전극 제조 313.2.1. 전처리 과정 313.2.2. 도금 용액 제조 323.2.3. 전기 도금 343.2.4. Zn침출 및 안정화 363.3. 물리화학적 분석 363.4. 전기화학적 분석 363.4.1. 도금 특성 분석 363.4.2. 전극 특성 분석 37Ⅳ. 결과 및 고찰 404.1. Ni, Ni-Zn, Ni-Zn-Fe 전극 특성 비교 404.2. 도금전류밀도에 따른 영향 484.3. 일정한 전하량에서 도금전류밀도와 도금 시간에 따른 영향 534.5. 도금용액 pH에 따른 영향 594.6. 도금 용액의 Ni, Fe 조성에 따른 영향 664.7. 지지체의 영향 71Ⅴ. 결 론 79Ⅵ. 참고 문헌 80ABSTRACT 89
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