碳材種類於質子交換膜電池中微孔層之應用研究

Study of different carbon materials as micro-porous layers for proton exchange membrane fuel cell application

曾韋禎(Wei-Jen Tzeng)

指導教授 ： 鐘國濱

元智大學/工程學院/機械工程學系/碩士(2012年)

摘要

膜電極為燃料電池之關鍵零組件，其中氣體擴散層為電子傳遞與氣體傳輸之媒介，是影響燃料電池性能與水管理之重要因素之一。一般而言氣體擴散層包涵一碳紙或碳布作為擴散基材（Gas Diffusion Subtract, GDS）與一微孔層（Micro-porous Layer, MPL）。現今GDL的文獻中多以MPL為研究重點，其中包括材料(例如Carbon Black)、添加物(親疏水材料、造孔劑)等。在本次實驗主要是利用四種碳材：Vulcan XC-72R, BP-2000,長奈米碳管(LVGCNT, 7 um)和短奈米碳管(SVGCNT, 3 um)以噴塗法進行微孔層的製備。將不同擔載量(0.5 ~ 3.0 mg/cm2)的碳材噴在碳紙上，而後個別做初步的物性分析，藉此挑選合適的擔載量。由於較佳之質傳效果，奈米碳管在燃料電池性能測試中有佳的表現。

關鍵字

微孔層 ； 奈米碳管 ； 膜電極

並列摘要

Membrane electrode assembly (MEA) is essential in the fuel cell system. The purpose of the gas diffusion layer (GDL) was to conduct electrons and gas transport; it also plays an important role on the fuel cell performance and water management. In general, the gas diffusion layer contains a gas diffusion subtract made of carbon paper or carbon cloth and a micro-porous layer (MPL). Current references in GDL research focuses on the materials, for example carbon black, and additives such as hydrophilic, hydrophobic, and pore-forming agents within the MPL.
In this study, four types of carbon: Vulcan XC-72R, BP-2000, long-vapor grown carbon nanotubes (LVGCNT, 7 um, ψ100 nm) and short-VGCNT (SVGCNT, 3 um, ψ100 nm) was tested as potential materials for the MPL. Each carbon was sprayed on carbon paper as MPL and with various carbon loading from 0.5 ~ 3.0 mg cm-2. The physical properties such as through-plane resistance and gas permeability, etc. were measured. After physical property tests, the best carbon loading from the above four types of carbons was chosen for further fuel cell performance testing. The improved performance of SVGCNT and LVGCNT compared to traditional used carbon powder- XC-72R primarily come from the low mass transfer resistance.

並列關鍵字

micro porous layer (MPL) ； vapor grown carbon nanotubes (VGCNT) ； proton exchange membrane fuel cell (PEMFC)

參考文獻

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