김영범
2019-11-24T16:36:11Z
2019-11-24T16:36:11Z
2017-04
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v. 42, no. 15, page. 10199-10207
0360-3199
1879-3487
https://www.sciencedirect.com/science/article/pii/S0360319917311126?via%3Dihub
https://repository.hanyang.ac.kr/handle/20.500.11754/113739
In this paper we investigate the influence of deposition temperature on the microstructure of yttria stabilized zirconia thin-films based on an anodized aluminum oxide (AAO) support structure. The yttria-stabilized zirconia (YSZ) electrolytes were deposited on a Pt anode/AAO support using DC magnetron reactive sputtering under deposition temperatures of RT and 500 degrees C. Elevating the deposition temperature led to enhanced surface mobility in the sputtered adatoms, which helped prevent pinhole generation and minimized the thickness of the electrolyte. A thin-film fuel cell with a YSZ electrolyte only 300 nm thick was successfully fabricated by elevating the deposition temperature. This cell exhibited an open circuit voltage (OCV) of 0.97 V, which is significantly higher than the OCV values of 0.3 V for a cell deposited at RT. However, in spite of the thin electrolyte, the performance of the cell deposited at the higher temperature showed limited value due to its relatively high polarization resistance. Through further investigation into the grain morphology, we verify that the increasing deposition temperature can affect not only the film density but also increase the grain size of the electrolyte, which is related to oxygen incorporation for ORR kinetics, Electrochemical impedance spectroscopy (EIS) results indicate that the grain size change caused by the elevated deposition temperature adversely affected the polarization resistance and the cell performance. These results indicate that careful adoption of elevated electrolyte deposition temperatures are required to optimize fuel cell performance. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
Y.B.K. gratefully acknowledges financial support from the Hanyang Industrial Park at Hanyang University (contract#: 201300000001479).
en_US
PERGAMON-ELSEVIER SCIENCE LTD
Solid oxide fuel cells
Physical vapor deposition
Nanoporous supporting substrate
Yttria-stabilized zirconia
Grain structures
Influence of deposition temperature on the microstructure of thin-film electrolyte for SOFCs with a nanoporous AAO support structure
Article
10.1016/j.ijhydene.2017.03.148
1-9
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Lim, Yonghyun
Hong, Soonwook
Bae, Jiwoong
Yang, Hwichul
Kim, Young-Beom
2017000241
S
COLLEGE OF ENGINEERING[S]
DIVISION OF MECHANICAL ENGINEERING
ybkim