質子交換膜燃料電池膨脹石墨雙極板製程與性質之研究

Study on the manufacture process and property of expanded graphite bipolar plate for PEMFC

許逸豪(Yi-Hao Hsu)

指導教授 ： 邱明志

共同指導教授 ： 陳興松(Hsing-Sung Chen)

國立虎尾科技大學/工程學院/材料科學與綠色能源工程研究所/碩士(2009年)

摘要

質子交換膜燃料電池是一種將燃料和氧化劑中的化學能直接或間接轉換成電能的發電裝置。相較於熱機或充電電池，質子交換膜燃料電池具有較高的能量轉換率。燃料電池中雙極板主要功用在分配燃料與氧化劑給MEA，並有串聯單電池之作用。此外，降低雙極板的成本是促成PEMFC大量生產的關鍵因素之一。
本研究是採用膨脹石墨為基材，分別將不同製程下所得之膨脹石墨利用模壓成型作成膨脹石墨板，研究目的乃分析、檢測製程對機械性質及相關電性之影響。由所得結果顯示密度為1.6g/cm3的膨脹石墨板作為燃料電池雙極板效果最佳。以此材質組裝燃料電池，並測量其IV曲線與IP曲線。結果顯示此類電池在操作溫度45℃時擁有最佳性能，且在0.254V時有最好的電流密度2577.6mA/cm2，0.406V時有最好功率密度807.94mW/cm2。由此實驗結果證明膨脹石墨雙極板應用於燃料電池是可行的。

關鍵字

質子交換膜燃料電池 ； 膨脹石墨板

並列摘要

PEMFC is an electrical device which directly converts chemical energy of fuel and oxidant to electricity. Compare to a heat engine or a rechargeable battery, PEMFC has high efficiency of energy transform. The main capability of a bipolar in fuel cell is to distribute fuel and oxidant to the membrane electrode and to provide electrically connection between neighboring single cells, and the cost reduction of bipolar is one of the key factors the industrialization of PEMFC.
In this research, the bipolar plates are made of expanded graphite. The purpose of this paper is to study the influence of various manufacture processes on the mechanical and electrical properties of the expanded graphite bipolar plates made by stamping method. The density of the chose graphite bipolar plates is 1.6 g /cm3. The characteristic IV curves and IP curves of the fuel cells are obtained from the corresponding tests. The experimental results show that fuel cell has the best performance and optimal operating condition when the operating temperature of 45℃ is achieved in the cell. The results also reveal that the great current density of 2577.6 mA/cm2 occurs at 0.254 V, and the highest power density of 807.94 mW/cm2 occurs at 0.406 V. It is proved that the expanded graphite bipolar plate is available to be the bipolar plates of PEMFC by way of these test results.

並列關鍵字

PEMFC ； expanded graphite bipolar plates

參考文獻

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