H2PtCl6/Nafion及Pt-C/Nafion溶液製作膜電極組之性能研究

Performances of membrane electrode assemblies prepared from H2PtCl6/Nafion and Pt-C/Nafion solutions

張育維(Yu-Wei Chang)

指導教授 ： 余子隆

元智大學/工程學院/化學工程與材料科學學系/碩士(2012年)

摘要

本論文以Nafion-212質子交換膜製作膜電極組。觸媒使用Pt-C(Pt 40 wt%沉積於碳粒表面)及氯鉑酸(H2PtCl6)觸媒溶液塗佈後還原成Pt粒子。膜電極組(MEA)結構共三種: (1)五層MEA-質子交換膜(PEM)位於MEA中間，PEM的兩側分別是Pt-C陰極及Pt-C陽極觸媒層；陰極及陽極觸媒層外側是GDL碳紙；(2)七層MEA-PEM位於MEA中間，PEM兩側分別是陰極與陽極之Pt-C觸媒層。兩個Pt-C觸媒層外側依序是H2PtCl6還原之Pt觸媒層及GDL；(3)七層MEA-與(2)之七層MEA相似，但陽極之H2PtCl6還原之Pt層則塗佈位於PEM與Pt-C觸媒中間，陰極觸媒層則與(2)之MEA相同。利用超音波噴塗製作MEA比較不同溶劑對單電池性能的影響。我們發現第(3)種七層MEA，陽極Pt總塗佈量0.2 mg/cm2，陰極Pt總塗佈量0.4 mg/cm2有最佳之電池性能，在80℃，H2/O2之燃料氣體的最高功率密度為1040 mW/cm2。

關鍵字

觸媒層 ； 全氟磺酸樹脂 ； 質子交換膜燃料電池 ； 膜電極組

並列摘要

In this study, we prepare membrane electrode assembly(MEA). Using Nafion-212 proton exchange membrane (PEM) and containing Pt-C (Pt deposited on carbon powder support; with 40 wt% Pt content) and chloroplatinic acid catalyst solution. Three different structures of MEAs are prepared including: (1) five layer MEA in which a PEM is located in the middle with two Pt-C catalyst layer being attached on both outside surfaces of the PEM and two gas diffusion layers (GDLs) attaching on the outside surfaces of Pt-C layers; (2) seven layer MEA in which PEM is in the middle of the whole structure with two Pt-C layers on both outside surfaces of the PEM, and two H2PtCl6 reduced Pt particle layers on the outside surfaces of Pt-C layers. We find that the seven layer MEA with total Pt loadings of 0.2 mg/cm2 at anode and 0.4 mg/cm2 at cathode has a best fuel cell performance.

並列關鍵字

Catalyst layer ； Nafion ； Proton exchange membrane fuel cell ； Membrane electrode assemblies

參考文獻

Ahn M., Cho Y.H., Jung N., Lim J.W., “Structural Modification of a Membrane Electrode Assembly via a Spray Coating in PEMFCs”, Journal of The Electrochemical Society, 159 (2) B145-B149 ( 2012 )

Cavarroc M., Ennadjaoui A., Mougenot M., Brault P., Escalier R., Tessier Y., Durand J., “Performance of plasma sputtered fuel cell electrodes with ultra-low Pt loadings”, Electrochemistry Communications 11 ( 2009 ) 859–861

Cho Y.H., Kim J., Yoo S.J., Jeon T.Y., Ahn M., Jung N., Cho Y.H., Lim J.W., Lee J.K., Yoon W.S, Sung Y.E., “Enhancement of polymer electrolyte membrane fuel cell performance by boiling a membrane electrode assembly in sulfuric acid solution”, Journal of Power Sources 195 ( 2010 ) 5952-5956

Cho Y.H., Kim S.K., Kim T.H., Cho Y.H., Lim J.W., “Preparation of MEA with the Polybenzimidazole Membrane for High Temperature PEM Fuel Cell”, Electrochemical and Solid-State Letters, 14 (3) B38-B40 ( 2011 )

Cho Y.H., Lim J.W., Kang Y.S., Cho Y.H., Kim O.H., “The dependence of performance degradation of membrane electrode assembly on platinum loading in polymer electrolyte membrane fuel cell”, international journal of hydrogen energy 37 ( 2012 ) 2490-2497