TY - JOUR
T1 - Application of FT-IR for in situ investigation of high temperature electrode reactions
AU - Murai, Takuya
AU - Yashiro, Keiji
AU - Kaimai, Atsushi
AU - Otake, Takanori
AU - Matsumoto, Hiroshige
AU - Kawada, Tatsuya
AU - Mizusaki, Junichiro
N1 - Funding Information:
This research was supported by Grant-in-Aid for Scientific Research on Priority Areas, 439 “Nanoionics”, the Ministry of Education, Culture, Sports, Science and Technology. A part of this study was supported by a 21st Century COE Program Grant of the International COE of Flow Dynamics and Special Coordination Funds for Promoting Science and Technology from Ministry of Education, Culture, Sports, Science and Technology.
PY - 2005/10
Y1 - 2005/10
N2 - Polarization modulated infrared reflection absorption spectroscopy (PM-IRRAS), which is one of the advanced FT-IR methods, was combined with conventional electrochemical techniques for in situ observation of high temperature electrode reactions at 773 K in oxygen partial pressure of 3 × 104 Pa. PM-IRRAS method can detect surface species selectively with high sensitivity at high temperatures without background measurement to cancel the infrared absorption by gas phase. Two different O2(g), Pt/YSZ electrochemical half cells were prepared as simple models of gas-electrodes. One of them had a working electrode which was composed of uniformly distributed platinum; the other had an island-networked platinum electrode. On the former electrode, PM-IRRAS detected a concentration change of adsorbed oxygen on Pt electrode with controlled cathodic overpotential. On the other hand, for the latter sample that showed smaller cathodic current, the signal of the adsorbed oxygen was suppressed by SiO2 impurity, whose spectrum was detected at 1220 cm- 1 by PM-IRRAS. It was shown that PM-IRRAS gives useful information on the state of adsorbed species which affect the electrode kinetics and the cell performance.
AB - Polarization modulated infrared reflection absorption spectroscopy (PM-IRRAS), which is one of the advanced FT-IR methods, was combined with conventional electrochemical techniques for in situ observation of high temperature electrode reactions at 773 K in oxygen partial pressure of 3 × 104 Pa. PM-IRRAS method can detect surface species selectively with high sensitivity at high temperatures without background measurement to cancel the infrared absorption by gas phase. Two different O2(g), Pt/YSZ electrochemical half cells were prepared as simple models of gas-electrodes. One of them had a working electrode which was composed of uniformly distributed platinum; the other had an island-networked platinum electrode. On the former electrode, PM-IRRAS detected a concentration change of adsorbed oxygen on Pt electrode with controlled cathodic overpotential. On the other hand, for the latter sample that showed smaller cathodic current, the signal of the adsorbed oxygen was suppressed by SiO2 impurity, whose spectrum was detected at 1220 cm- 1 by PM-IRRAS. It was shown that PM-IRRAS gives useful information on the state of adsorbed species which affect the electrode kinetics and the cell performance.
UR - http://www.scopus.com/inward/record.url?scp=25444496424&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=25444496424&partnerID=8YFLogxK
U2 - 10.1016/j.ssi.2005.06.029
DO - 10.1016/j.ssi.2005.06.029
M3 - Conference article
AN - SCOPUS:25444496424
SN - 0167-2738
VL - 176
SP - 2399
EP - 2403
JO - Solid State Ionics
JF - Solid State Ionics
IS - 31-34
T2 - 30th Symposium on Solid State Ionics in Japan
Y2 - 1 December 2004 through 3 December 2004
ER -