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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 김용태
- 발행연도
- 2016
- 저작권
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Thermo-electrochemical cells (TECs) based on the redox reaction of hexacyanoferrate (HCF) are energy harvesters which can convert low-grade waste heat (below the boiling point of water) into electricity. This system has some advantages that are simple design, good maintenance, high seebeck coefficient and so on. However, there are hurdles to commercialize the TEC, one of those things is the high manufacturing cost resulting from the employment of high-cost electrode materials like Pt, graphene, and carbon nanotubes because of the stability of redox reactions. Hence, it still needs further studies to develop the new systems which have high conversion efficiency with low-manufacturing cost.
Herein, we report the hybrid TECs having both concepts with exploitation of low-cost non-noble W for the electrode materials in TECs. We made the high accuracy temperature control system which has 0.1℃ control ranges. We choose low-cost non-noble W for the electrode materials using the Pourbaix diagram and Cyclic voltammetry (CV) measurements. To assess cell performance in relation to W electrode, we did electrochemical experiments with Linear Sweep Voltammetry (LSV) method. As a result, we interestingly found a possibility of the new hybrid TECs system that has surpassed conventional seebeck coefficient. Moreover, we analyzed the reaction mechanism of hybrid systems with X-ray Photoelectron Spectroscopy (XPS) and X-ray Absorption Near-edge Structure (XANES) measurements. Hybrid TECs not only has high conversion efficient but also can reduce the manufacturing cost about 1/1500 of Pt electrode TECs. Therefore, this study can suggest new directions lead to the development of ideal TECs.
Herein, we report the hybrid TECs having both concepts with exploitation of low-cost non-noble W for the electrode materials in TECs. We made the high accuracy temperature control system which has 0.1℃ control ranges. We choose low-cost non-noble W for the electrode materials using the Pourbaix diagram and Cyclic voltammetry (CV) measurements. To assess cell performance in relation to W electrode, we did electrochemical experiments with Linear Sweep Voltammetry (LSV) method. As a result, we interestingly found a possibility of the new hybrid TECs system that has surpassed conventional seebeck coefficient. Moreover, we analyzed the reaction mechanism of hybrid systems with X-ray Photoelectron Spectroscopy (XPS) and X-ray Absorption Near-edge Structure (XANES) measurements. Hybrid TECs not only has high conversion efficient but also can reduce the manufacturing cost about 1/1500 of Pt electrode TECs. Therefore, this study can suggest new directions lead to the development of ideal TECs.
목차
제1장 서론 11.1 연구배경 11.2 선행연구 61.2.1 Undeveloped Thermoelctrochemical cells 61.2.2 Redox Electrolytes 71.2.3 High Surface Area Electrodes 71.3 연구목적 9제2장 이론적 배경 102.1 열전기화학 에너지 하베스터 원리 102.1.1 Nernst Equation 112.1.2 Butler-Volmer Equation 142.1.3 Polarization 152.2 열전기화학 에너지 하베스터 구성 182.3 열전기화학 에너지 하베스터 성능 192.3.1 Seebeck Coefficient 192.3.2 Open Circuit Potential & Current Density 202.3.3 Power Density 212.4 하이브리드 열전기화학 에너지 하베스터 232.5 Pourbaix Diagram 252.6 Arrhenius 방정식 26제3장 실험방법 283.1 온도차 형성 시스템 283.2 열-전기화학 특성 평가 303.2.1 Cyclic Voltammetry 303.2.2 Linear Sweep Voltammetry 313.2.3 Power Density 313.3 반응 메커니즘 분석 323.3.1 X-ray Absorption Near Edge Structure 323.3.2 X-ray Photoelectron Spectroscopy 33제4장 실험결과 및 고찰 344.1 열-전기화학 특성 344.1.1 Cyclic Voltammetry 344.1.2 Open Circuit Potential 364.1.3 Open Circuit Current Density 374.1.4 Power Density 384.2 반응 메커니즘 394.2.1 Arrhenius Plot 394.2.2 X-ray Absorption Near Edge Structure 414.2.3 X-ray Photoelectron Spectroscopy 43제5장 결론 46참고문헌 51ABSTRACT 82
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