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논문 기본 정보

자료유형
학위논문
저자정보

김문수 (인하대학교, 인하대학교 대학원)

지도교수
최진섭
발행연도
2017
저작권
인하대학교 논문은 저작권에 의해 보호받습니다.

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이 논문의 연구 히스토리 (2)

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In this study, it is demonstrated that facile decoration of tungsten oxide catalyst on the electrode can enhance the electrochemical performance of vanadium redox flow battery (VRFB). Tungsten hexachloride is employed as the precursor for the tungsten oxide deposition. In addition, precursor is added into the negative electrolyte, which is changed to polyoxide acid form during VRFB cycling. It is found that tungsten polyoxide acid is electrodeposited, transforming to tungsten oxide during the battery cycle. The cell performance is measured by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), polarization curve, linear sweep voltammetry (LSV) and cycle test. The tungsten concentration is carefully optimized based on the performance of battery cycle. Cycle test shows that the energy efficiency of the cell is enhanced by about 3 % after facile addition of tungsten into electrolyte. After operating cell cycle, tungsten oxide is locally decorated on the electrode, whose components are analyzed by scanning electron microscope (SEM) image and the energy dispersive X-ray spectroscopy (EDX). Inductively coupled plasma mass spectrometry (ICP-MS) shows that tungsten precursor does not permeate through ion exchange membrane during the cycles.

목차

1. Introduction 1
1.1 About vanadium redox flow battery (VRFB) 1
1.2. Motivation for research 3
1.3. Background information 5
2. Experimental and analysis 7
2.1 Experimental section 7
2.1.1 Materials 7
2.1.2 Balance processing for operation of VRFB 7
2.2 Analysis section 8
2.2.1 Potentiostat 8
2.2.2 Cell cycle test 9
2.2.3 Scanning Electron Microscope (SEM) & Energy Dispersive X-ray Spectroscopy (EDS) 10
2.2.4 Inductively Coupled Plasma Mass Spectroscopy (ICP-MS) 10
3. Results & Discussion 12
3.1 Analysis of tungsten catalytic effect for improvement of electrochemical performance 12
3.2 Optimization of tungsten concentration 15
3.3 Cycle test at optimum point of tungsten concentration 21
3.4 SEM images and Energy Dispersive X-ray spectroscopy (EDX) analysis 25
3.5 Inductively coupled Plasma Mass Spectroscopy (ICP-MS) analysis 27
4. Conclusion 30
5. References 32
Acknowledgement 37

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