Characterization of Active Sites in Solid Oxide Fuel Cell Composite Cathode through Oxygen Isotope Labeling Combined with Three-Dimensional Microstructural Analysis by Focused Ion Beam – Scanning Electron Microscopy

2019 ◽  
Vol 91 (1) ◽  
pp. 1371-1375
Author(s):  
Tsuyoshi Nagasawa ◽  
Takaaki Shimura ◽  
Naoki Shikazono ◽  
Katsunori Hanamura
Keyword(s):  
Active Sites ◽  
Focused Ion Beam ◽  
Isotope Labeling ◽  
Ion Beam ◽  
Microstructural Analysis ◽  
Three Dimensional ◽  
Composite Cathode ◽  
Solid Oxide ◽  
Oxide Fuel

scholarly journals Thin Solid Film Electrolyte and Its Impact on Electrode Polarization in Solid Oxide Fuel Cells Studied by Three-Dimensional Microstructure-Scale Numerical Simulation

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5127
Author(s):  
Tomasz A. Prokop ◽  
Grzegorz Brus ◽  
Shinji Kimijima ◽  
Janusz S. Szmyd
Keyword(s):  
Focused Ion Beam ◽  
Ion Beam ◽  
Three Dimensional ◽  
Reaction Rates ◽  
Solid Oxide ◽  
Scale Model ◽  
Electrode Polarization ◽  
Computational Domain ◽  
Oxide Fuel ◽  
The Impact

In this work, a three-dimensional microstructure-scale model of a Solid Oxide Fuel Cell’s Positive-Electrolyte-Negative assembly is applied for the purpose of investigating the impact of decreasing the electrolyte thickness on the magnitude, and the composition of electrochemical losses generated within the cell. Focused-Ion-Beam Scanning Electron Microscopy reconstructions are used to construct a computational domain, in which charge transport equations are solved. Butler–Volmer model is used to compute local reaction rates, and empirical relationships are used to obtain local conductivities. The results point towards three-dimensional nature of transport phenomena in thin electrolytes, and electrode-electrolyte interfaces.

Quantification of Microstructural and Transport Properties of Solid Oxide Fuel Cells From Three-Dimensional Physically Realistic Network Structures

2011 ◽  
Author(s):  
Naga Siva Kumar Gunda ◽  
Sushanta K. Mitra
Keyword(s):  
Transport Properties ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Three Dimensional ◽  
Solid Oxide ◽  
Network Structures ◽  
Oxide Fuel ◽  
Lanthanum Strontium Manganite ◽  
Cross Sectional ◽  
Effective Transport

The present work investigated a new method of calculating effective transport properties of solid oxide fuel cell (SOFC) electrodes from three-dimensional (3D) physically realistic network structures. These physically realistic network structures are topological equivalent representations of reconstructed microstructures in the form of spheres (nodes or bodies) and cylinders (segments or throats). Maximal ball algorithm is used to extract these physically realistic network structures from the series of two-dimensional (2D) cross-sectional images of SOFC electrodes. Dual-beam focused ion beam - scanning electron microscopy (FIB-SEM) is performed on SOFC electrodes to acquire series of 2D cross-sectional images. Finite element method is implemented to compute the effective transport properties from the network structures. As an example, we applied this method to calculate the effective gas diffusivity of lanthanum strontium manganite (LSM) of SOFC. The results obtained from physically realistic network structures are compared with reconstructed 3D microstructures.

Three-Dimensional Analysis of Solid Oxide Fuel Cell Ni-YSZ Anode Interconnectivity

2009 ◽  
Vol 15 (1) ◽  
pp. 71-77 ◽  
Author(s):  
James R. Wilson ◽  
Marcio Gameiro ◽  
Konstantin Mischaikow ◽  
William Kalies ◽  
Peter W. Voorhees ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Three Dimensional ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Electrochemically Active ◽  
Fuel Cell Electrode ◽  
Cell Electrode

AbstractA method is described for quantitatively analyzing the level of interconnectivity of solid-oxide fuel cell electrode phases. The method was applied to the three-dimensional microstructure of a Ni–Y2O3-stabilized ZrO2 (Ni-YSZ) anode active layer measured by focused ion beam scanning electron microscopy. Each individual contiguous network of Ni, YSZ, and porosity was identified and labeled according to whether it was contiguous with the rest of the electrode. It was determined that the YSZ phase was 100% connected, whereas at least 86% of the Ni and 96% of the pores were connected. Triple-phase boundary (TPB) segments were identified and evaluated with respect to the contiguity of each of the three phases at their locations. It was found that 11.6% of the TPB length was on one or more isolated phases and hence was not electrochemically active.

Three Dimensional Reconstruction of Solid Oxide Fuel Cell Electrodes Using Focused Ion Beam - Scanning Electron Microscopy

2019 ◽  
Vol 7 (1) ◽  
pp. 1879-1887 ◽  
Author(s):  
James Wilson ◽  
Worawarit Kobsiriphat ◽  
Roberto Mendoza ◽  
Hsun-Yi Chen ◽  
Tom Hines ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Three Dimensional ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Fuel Cell Electrodes ◽  
Dimensional Reconstruction ◽  
Scanning Electron
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