کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7724965 | 1497839 | 2018 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Three-dimensional microstructure analysis of a polymer electrolyte membrane water electrolyzer anode
ترجمه فارسی عنوان
تجزیه ریزساختار سه بعدی یک آندز الکترولیز آب غشای الکترولیتی پلیمر
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
چکیده انگلیسی
The anode catalyst layer of a PEM water electrolyzer is reconstructed using a combination of FIB-SEM tomography and ionomer modeling. The pore space is infiltrated with silicone, enabling good discrimination between pores and IrRuOx catalyst material, while the ionomer cannot be imaged. The reconstructed volume of 29â¯Î¼mâ¯Ãâ¯24â¯Î¼m x 7â¯Î¼m contains catalyst particles with a median size of 0.5â¯Î¼m and has a porosity of 55%. By modeling different ionomer contents inside the pore space, the impact on microstructural and transport parameters is investigated. At an ionomer content of 40-50% of the pore volume, all transport parameters are in a reasonable range, confirming experimental results from literature. At an ionomer content of 48% the catalyst layer has a porosity of 29%, a median pore size of 0.94â¯Î¼m, a permeability of the pore space of 1.8mD and a mean ionomer film thickness of 0.4μm. The tortuosities of the ionomer and the pore space are calculated to 3.5 and 6.7â¯at the corresponding phase fractions of 26% and 29% respectively. The electrochemically active surface area estimated from the tomography (1.0m2gâ1) is considerably lower than literature values, indicating a roughness below FIB-SEM resolution.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 393, 31 July 2018, Pages 62-66
Journal: Journal of Power Sources - Volume 393, 31 July 2018, Pages 62-66
نویسندگان
Friedemann Hegge, Riko Moroni, Patrick Trinke, Boris Bensmann, Richard Hanke-Rauschenbach, Simon Thiele, Severin Vierrath,