Related Experiment Video
Updated: Sep 6, 2025
15:08
Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells
Published on: September 20, 2012
16.1K
In Situ Nanoscale Dynamics Imaging in a Proton-Conducting Solid Oxide for Protonic Ceramic Fuel Cells
Oleg Gorobtsov1, Yumeng Song1, Kevin Fritz1
1Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|June 24, 2022
Summary
Yttrium-doped barium zirconate (BZY) exhibits nanoscale structural changes and cracking during hydration, impacting proton conductivity in solid oxide fuel cells. Understanding these dynamics is key for developing stable, low-temperature electrochemical devices.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Energy Technology
Background:
- Proton-conducting solid oxides are crucial for clean energy technologies like hydrogen fuel cells and electrolyzers.
- Yttrium-doped barium zirconate (BZY) shows promise due to its stability and conductivity at lower temperatures (below 400°C).
- Nanoscale structural dynamics, especially at grain interfaces and defects, significantly influence proton transport and material performance.
Purpose of the Study:
- To investigate the in situ nanoscale crystal structure dynamics of BZY during low-temperature hydration.
- To understand how topological defects and grain interfaces affect proton conductivity and material stability.
- To correlate nanoscale phenomena with macroscale material behavior for improved device design.
Main Methods:
- Bragg coherent X-ray diffractive imaging was employed for in situ, 3D nanoscale analysis.
- The study focused on BZY hydration over 40 hours at 200°C.
- Advanced X-ray techniques were used to observe crystal structure evolution at the nanoscale.
Main Results:
- Unexpected nanoscale activity of topological defects and subsequent cracking were observed, hidden by macroscale stability.
- Structural rearrangements correlated with emergent regions of varying lattice constants, indicating heterogeneous hydration.
- These nanoscale processes significantly impact the material's properties at low temperatures.
Conclusions:
- Nanoscale processes, including defect activity and cracking, play a critical role in the performance and stability of proton-conducting solid oxides.
- Heterogeneous hydration at the nanoscale affects overall proton transport.
- These findings are essential for optimizing the design and operation of low-temperature protonic ceramic electrochemical cells for the clean energy transition.
