Membrane electrode assemblies with low noble metal loadings for hydrogen production from solid polymer electrolyte water electrolysis

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• 作者：Huaneng Su ; Vladimir Linkov ; Bernard Jan Bladergroen
• 关键词：Membrane electrode assembly ; Low noble metal loading ; Water electrolysis ; Solid polymer electrolyte
• 刊名：International Journal of Hydrogen Energy
• 出版年：2013
• 出版时间：6 August, 2013
• 年：2013
• 卷：38
• 期：23
• 页码：9601-9608
• 全文大小：1252 K

文摘

High performance membrane electrode assemblies (MEAs) with low noble metal loadings (NMLs) were developed for solid polymer electrolyte (SPE) water electrolysis. The electrochemical and physical characterization of the MEAs was performed by I-V curves, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). Even though the total NML was lowered to 0.38?mg?cm^?2, it still reached a high performance of 1.633?V at 2?A?cm^?2 and 80?¡ãC, with IrO₂ as anode catalyst. The influences of the ionomer content in the anode catalyst layer (CL) and the cell temperature were investigated with the purpose of optimizing the performance. SEM and EIS measurements revealed that the MEA with low NML has very thin porous cathode and anode CLs that get intimate contact with the electrolyte membrane, which makes a reduced mass transport limitation and lower ohmic resistance of the MEA. A short-term water electrolysis operation at 1?A?cm^?2 showed that the MEA has good stability: the cell voltage maintained at ¡«1.60?V without distinct degradation after 122?h operation at 80?¡ãC and atmospheric pressure.