Tomographic Reconstruction and Analysis of a Silver CO2 Reduction Cathode

Mclaughlin D, Bierling M, Moroni R, Vogl C, Schmid G, Thiele S (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Advanced Energy Materials Wiley

DOI: 10.1002/aenm.202000488

Abstract

Tomographic reconstruction has been well established as a valuable tool in the analysis of polymer electrolyte fuel cell (PEMFC) electrodes. While forays have been made into applying it to polymer electrolyte water electrolyzer (PEMWE) electrodes, CO2 electrolyzer electrodes are still new ground. Here a tomographic analysis of an electrochemical CO2 reduction gas diffusion electrode by means of focused ion beam scanning electron microscope tomography is presented. The reconstruction shows a porosity of 68%. While most of the porosity is on the nanoscale, a broad tail of micropores is observed in the distribution. The spatial distribution of the pores is nonuniform. The large pores are concentrated in the center of the layer in the through-plane direction. From the reconstruction, an effective diffusivity factor of 0.5 for the catalyst layer is calculated. The Knudsen number of 0.19 obtained from the later shows that the diffusion is mostly in the bulk regime. Flooding of the catalyst layer is likely to decrease the effective diffusivity factor substantially.

Authors with CRIS profile

Markus Bierling Professur für Electrocatalytic Interface Engineering (HIERN) Simon Thiele Professur für Electrocatalytic Interface Engineering (HIERN)

Involved external institutions

Albert-Ludwigs-Universität Freiburg DE Germany (DE) Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE) Siemens AG, Sector Corporate Technology DE Germany (DE)

How to cite

APA:

Mclaughlin, D., Bierling, M., Moroni, R., Vogl, C., Schmid, G., & Thiele, S. (2020). Tomographic Reconstruction and Analysis of a Silver CO2 Reduction Cathode. Advanced Energy Materials. https://dx.doi.org/10.1002/aenm.202000488

MLA:

Mclaughlin, David, et al. "Tomographic Reconstruction and Analysis of a Silver CO2 Reduction Cathode." Advanced Energy Materials (2020).

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