硫化氫對高溫質子交換膜燃料電池性能之影響

康荏鈞(REN-JUIN KANG)

指導教授 ： 陳永松

國立中正大學/工學院/機械工程學系/碩士(2016年)

摘要

燃料電池是直接將化學能轉換成電能的裝置。在多種燃料電池中，高溫質子交換膜燃料電池（HT-PEMFC）的操作溫度範圍在160~200℃之間；因此有許多優點，例如：更快的反應動力學、高雜質耐受性、可重複使用的高品質熱，並且不需要加濕器。此外，對於HT-PEMFC供給的氫可以從各種來源重組後獲得，例如天然氣和生質氣體。在重整過程中，一氧化碳和硫化氫是常見的副產物，並且可以提供氫氣給HT-PEMFC使用，而燃料中的一氧化碳和硫化氫會造成HT-PEMFC的性能下降。
許多研究已經探討膜電極組的製程和操作條件對一氧化碳耐受性的影響；較少討論硫化氫對電池性能的影響。在這項研究中，膜電極組的製程使用超聲波噴塗系統製造。藉由改變PVDF含量和鉑附載量的影響進行討論後，使用最佳的PVDF比例與鉑附載量進行實驗，並採用電化學阻抗譜分析硫化氫對各種鉑負載和操作條件對MEA的影響，以及長時間硫化氫操作下MEA的耐久性進行測試和討論。

關鍵字

高溫燃料電池 ； 膜電極組 ； 超音波噴塗 ； 觸媒層 ； 硫化氫

並列摘要

Fuel cells are devices that directly convert chemical energy into electrical energy. Among various fuel cells, the operating temperature of high temperature proton exchange membrane fuel cells (HT-PEMFC) ranges between 160 and 200 °C; hence, they have the advantages of faster reaction kinetics, high tolerance to pollutant, high quality of reusable heat, and no need of humidifier. Besides, hydrogen supplied for HT-PEMFC can be reformatted from various sources, such as natural gas and biomass. During the reforming process, carbon monoxide and hydrogen sulfide are common byproducts and may be supplied to HT-PEMFC with hydrogen, causing performance drop of the HT-PEMFC.
Many of studies have investigated the effects of fabrication process and operating condition on the carbon monoxide tolerance of membrane electrode assemblies; few of them focused on the effect of hydrogen sulfide on the cell performance. In this study, membrane electrode assemblies were fabricated using an ultrasonic spraying system. The effects of PVDF and catalyst loading on cell performance were investigated and discussed. The optimal PVDF and Pt compositions in the catalyst layer were suggested. The effect of hydrogen sulfide on the MEA with various Pt loadings and operating conditions were analyzed using electrochemical impedance spectroscopy. The durability of the MEA operated under hydrogen sulfide were tested and discussed.

並列關鍵字

High-temperature proton exchange membrane fuel cell ； membrane electrode assembly ； ultrasonic spray coating ； catalyst layer ； hydrogen sulfide

參考文獻

[1] N. V. Long, C. M. Thi, M. Nogami, and M. Ohtaki, “Novel Pt and Pd Based Core-Shell Catalysts with Critical New Issues of Heat Treatment , Stability and Durability for Proton Exchange Membrane Fuel Cells and Direct Methanol Fuel Cells,” 2012.

[3] J. Larminie and A. Dicks, Fuel cell systems explained. 2003.

[4] L. Angeles, “L. Angeles, ‘2015 FUEL CELL SEMINAR & ENERGY EXPOSITION - EXHIBITOR PROSPECTUS EXHIBIT AT THE 2015 FUEL CELL SEMINAR,’ 2015,” 2015.

[6] C. He, H. R. Kunz, and J. M. Fenton, “Selective Oxidation of CO in Hydrogen under Fuel Cell Operating Conditions,” J. Electrochem. Soc., vol. 148, no. 10, p. A1116, 2001.

[7] H. Yuan, H. Song, X. Qiu, W. Zhu, and L. Chen, “Electrochemistry Communications Electrochemical characters and structure changes of electrochemically treated Pt nanoparticles,” Electrochem. commun., vol. 12, no. 1, pp. 14–17, 2010.