Optimization of grain boundary architecture and chemistry for efficient, durable SOFC/SOEC electrodes
| Project/Area Number |
15K18213
|
|---|
| Research Category |
Grant-in-Aid for Young Scientists (B)
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Inorganic materials/Physical properties
|
|---|
| Research Institution | Kyushu University |
|---|
Principal Investigator |
Perry Nicola 九州大学, カーボンニュートラル・エネルギー国際研究所, 助教 (90645665)
|
|---|
| Research Collaborator |
Ertekin Elif University of Illinois at Urbana-Champaign, Department of Mechanical Engineering, Associate Professor
Harrington George Kyushu University, Assistant Professor
Tuller Harry MIT, Department of Materials Science and Engineering, Professor
|
|---|
| Project Period (FY) |
2015-04-01 – 2017-03-31
|
| Project Status |
Completed (Fiscal Year 2016)
|
| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2015: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
|
|---|
| Keywords | solid oxide fuel cell / electrode / optical absorption / oxygen exchange / surface chemistry / thin films / pulsed laser deposition / efficiency / SOFC / SOEC / thin film / oxygen surface exchange / grain boundaries / Sr segregation / durability / energy |
|---|
| Outline of Final Research Achievements |
The role of nanostructure, including grain boundaries, on oxygen surface exchange kinetics of a mixed conductor were studied, in order to identify optimal structure and grain boundary chemistry for rapid exchange kinetics and therefore high SOFC/SOEC efficiency.
Sr(Ti,Fe)O3-x films with different nanostructures were fabricated by pulsed laser deposition. Higher growth temperatures led to increased crystallinity and crystalline quality, larger grains, higher surface roughness, higher oxygen content, and modified surface chemistry. An in situ optical absorption relaxation approach was used to evaluate the films' oxygen surface exchange kinetics (k). Faster kinetics were seen for crystalline films compared to amorphous films. In situ crystallization resulted in ultra-fast k. k and its degradation over time correlated with changes in surface chemistry. Local doping of grain boundaries did not improve k.
[More results to be added later after publication.]
|
Report
(3 results)
Research Products
(26 results)
