Amorphous Nano-Crystalline (ANC) Materials for Fuel-cell Electrodes

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题名:	Amorphous Nano-Crystalline (ANC) Materials for Fuel-cell Electrodes
作者:	李豐明朱益新彭文宏楊家儒
贡献者:	工學院
关键词:	Nano-particles nano-dispersion fuel cells high surface area catalytic particles amorphous nano-crystalline ANC materials honeycomb structure half-cell device
日期:	2003-06-01
上传时间:	2012-05-09 14:01:29 (UTC+8)
摘要:	去(2002)年八月由聯合國主辦在南非約翰聶士堡召開的「世界永續發展高峰會議」再次呼籲陝速發展乾淨能源代替石化燃料，無疑對全球關心能源與環保的研究者是鼓舞與勉勵。美國布希總統於今年初在國情合文中大聲疾呼提議國會撥出150億美元積極推動開發乾淨的氫氣燃料電池。理論上，以燃料電池供應乾淨能源是充滿應允的途徑。然而，技術上仍然存在尚待解決的一些問題，其中尤其以電極材料之低效率、耐用度和高價格等最急待改善。本文提出頗有希望的實驗結果，顯示將奈米級觸媒顆粒（如白金）散佈於多孔基材中並以導電塑膠(如Nafion)網膜固定的電極材料，果然可以發揮最高的表面效應，也則奈米顆粒和三維分佈的雙重效果。本文也推薦使用所謂非奈晶材料(ANC)之微粒爲電極材料的觸媒。非奈晶本身爲非晶卻包含無數奈米級結晶顆粒的觸媒(5～10%的白金)，利用融旋冷卻方法，加上適當的熱處理和酸液浸蝕所獲得的薄材。本文主要探討各種將微粒散佈於三維的氧化鋁蜂巢孔洞內的技術，並將散佈後的電極裝置於自製的半電池電化但臨式儀，量測其電流－電壓(IV)曲線。以ANC微粒爲觸媒的電極所輸出的電流，果然比濺鍍合金爲電極的高20倍之多。 While the world is still assessing the impact of the UN-sponsored World Summit on Sustainable Development held in Johanesburg in August of 2002, the world action of cutting down on fossil-fuel use by developing more clean energy remains steadfast. President Bush of the United States addressed in his State of Union in January of 2003 that a budget of US$15 billions will be allocated for the development of clean hydrogen fuel cells. In theory and research, the potential of fuel cells to provide for clean energy is highly promising. However, in technical aspect there exist several problems yet to be resolved. Among them, the efficiency, durability, and high cost of electrode materials for fuel cells remain to be improved. In this paper we present some promising results in which nano-dispersion of catalytic particles are secured on a porous substrate with conductive polymer network. With such electrodes the catalytic particles can achieve a maximum surface area in both particle size reduction and three-dimensional distribution. Another concern for fuel cell electrodes is the corrosion resistance of both catalytic particles and substrate materials. We employed Amorphous Nano-Crystalline (ANC) materials as the catalytic particles and alumna honeycomb structure with nano-size holes as the substrate in one of our tests. The ANC alloys containing multiple metals including catalytic platinum of 5 to 10 atomic% were obtained by a melt spinning technique. The platinum particles can be manipulated to nano-crystalline sizes by a proper thermal treatment followed by etching the amorphous matrix. The alumna substrate was prepared from anodic treatment of a pure aluminum sheet. We prepared several kinds of electrode materials with different kinds of dispersion techniques, and then tested them with a half-cell electrochemical device of our own design under various test conditions. Some results are outstandingly high in output and stable in reproducibility.
關聯:	華岡工程學報 17期 p.1 -20
显示于类别:	[工學院] 學報-華岡工程學報

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