Study on wettability effect on water transport in gas diffusion layer of PEFC
Islanabilirliğin PEFC'nin Gaz Difüzyon Tabakası İçindeki Su Taşınımına Etkisini Üzerine Çalışma
- Tez No: 912761
- Danışmanlar: PROF. DR. TABE YUTAKA
- Tez Türü: Yüksek Lisans
- Konular: Makine Mühendisliği, Mechanical Engineering
- Anahtar Kelimeler: polymer electrolyte fuel cells, gas diffusion layer, wettability, Lattice Boltzmann method, scale model experiment
- Yıl: 2019
- Dil: İngilizce
- Üniversite: Hokkaıdo Unıversıty
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Makine Mühendisliği Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
Polymer electrolyte fuel cell (PEFC) systems are one of the most promising technologies which can be used as a power sources of transportation sectors. Its high efficiency and low CO2 emissions are its biggest advantages over conventional engines. However, under the high current density operations due to the high amount of water production at the cathode side of the PEFC, the diffusion of oxygen to the catalyst layer decreases. This phenomenon results in a strong decrease in fuel cell performance. It is therefore essential to decrease the amount of water inside the gas diffusion layer (GDL), so that the polymer electrolyte fuel cell systems performance can increase. This current study explores the effect of wettability designs with hydrophilic and hydrophobic regions in GDLs to create dedicated pathways for oxygen and water transportation. The first step in this research was to observe water behavior inside of the GDL, through the Lattice Boltzmann Method simulation and scale model experiment. Furthermore, hydrophilic surface treatment with 85ºC contact angle is applied on hydrophobic GDL, and is analyzed by LBM simulation and scale model experiment. Experimental results show that the extremely high amount of water in the GDL, mainly caused by water accumulation under the rib, has decreased successfully through hydrophilic surface treatment. In the second part of this research, three different designs have been applied on the GDL. These designs are a) dot design, b) 2mm-2mm stripped design and c) 2mm-6mm stripped design. In order to create hydrophobic patterns, the GDL is coated with polytetrafluoroethylene (PTFE), respectively with ten, twenty, and sixty percent solutions. Moreover, the newly designed GDLs have been tested in a single fuel cell test station and its performance has been evaluated by I-V curves. Results shows that a 2mm-2mm striped design with ten percent PTFE coating gives the best results, as it enables a high interaction area between hydrophilic and hydrophobic regions.
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