Porous Strained Pt Nanostructured Thin Film Electrocatalysts via Dealloying for PEM Fuel Cells
Porous Strained Pt Nanostructured Thin Film Electrocatalysts via Dealloying for PEM Fuel Cells
- 주제(키워드) fuel cell
- 발행기관 고려대학교 대학원
- 지도교수 문병무
- 발행년도 2019
- 학위수여년월 2019. 2
- 학위구분 석사
- 학과 대학원 전기전자공학과
- 원문페이지 66 p
- 실제URI http://www.dcollection.net/handler/korea/000000083403
- UCI I804:11009-000000083403
- 본문언어 영어
초록/요약
Polymer electrolyte membrane fuel cells (PEMFCs) are widely believed to play a key role as environmentally friendly alternative energy technologies due to high energy conversion efficiency and zero emission. Generally, commercial Pt/C composed of Pt nanoparticles supported on carbon black has been used as an electrocatalyst for oxygen reduction reaection of PEMFCs. However, several limitations of Pt/C such as degradation of carbon support and aggregation or dissolution of Pt nanoparticles must be overcome for practical applications of PEMFCs. Herein, we report three-dimensional nanoporous Pt thin films containing both mesopores and macropores as a highly active and stable electrocatalyst for oxygen reduction reaction. Nanoporous Pt thin film were fabricated by oxygen plasma dealloying of sputter-deposited Pt-carbon thin films. When tested as electrocatalysts through half-cell test, the catalytic activity of nanoporous Pt thin films surpasses that of commercial Pt/C due to compressive strain derived from oxygen plasma dealloying process. Furthermore, carbon-free nanoporous Pt thin film also mitigates carbon corrosion issues which lead to catalyst detachment and loss of electrochemical surface area in commercial Pt/C. Thus. It exhibits superior catalytic robustness under the harsh conditions such as start-up and shut-down compared to commercial Pt/C. We believe that this new approach will provide a new way to fabricate highly active and stable electrocatalyst for PEMFCs applications.
more목차
Chapter 1. Introduction 1
1.1 Introduction of paper 1
1.2 Fuel cells 5
1.3 Oxygen reduction reaction (ORR) 7
1.4 Electrochemical active surface area(ECSA) 10
1.5 Rotating disk electrode (RDE) 13
1.6 Various X-ray Analyses 16
Chapter 2. Experimental 23
2.1 Fabrication of nanoporous Pt thin film by O2 plasma dealloying 23
2.2 Materials Characterization 24
2.3 Electrochemical measurement 24
2.4 MEA fabrication 23
Chapter 3. Results and Discussion 16
3.1 Nanoporous thin film electrode catalyst 26
3.1.1 Experimental procedure 26
3.1.2 X-ray Photoelectron Spectroscopy(XPS) 29
3.1.3 Scanning Electron Microscope(SEM) 31
3.1.4 Microstructure of the compressive strained nanoporous Pt thin film 37
3.1.5 Durability 36
3.2 Applied PEMFC 43
Chapter 4. Conclusions 49
References 51
