Three-dimensional microstructure analysis of a polymer electrolyte membrane water electrolyzer anode
| Autor: | Simon Thiele, Riko Moroni, Boris Bensmann, Richard Hanke-Rauschenbach, Friedemann Hegge, Patrick Trinke, Severin Vierrath |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Electrolysis Materials science Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology 02 engineering and technology Polymer Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences 0104 chemical sciences Anode law.invention chemistry.chemical_compound chemistry law Phase (matter) Electrical and Electronic Engineering Physical and Theoretical Chemistry Composite material 0210 nano-technology Porosity Ionomer |
| Zdroj: | Journal of Power Sources. 393:62-66 |
| ISSN: | 0378-7753 |
| Popis: | 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 29 μm × 24 μm x 7 μm contains catalyst particles with a median size of 0.5 μm 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 0.94 μm, a permeability of the pore space of 1.8 mD and a mean ionomer film thickness of 0.4 μm . The tortuosities of the ionomer and the pore space are calculated to 3.5 and 6.7 at the corresponding phase fractions of 26% and 29% respectively. The electrochemically active surface area estimated from the tomography ( 1.0 m 2 g − 1 ) is considerably lower than literature values, indicating a roughness below FIB-SEM resolution. |
| Databáze: | OpenAIRE |
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