Abstract
Ceramic electrolytes operating in the temperature range of 200 to 500 °C under dry atmosphere are a key material for the next-generation fuel cell and related applications. We discovered that nanometer-thick films of amorphous hafnium silicate (HfnSi1 - nOx) exhibited efficient ionic conduction at 100-400 °C in dry air. When the fraction of hafnium doping was around 0.1, the nanofilm showed a low area-specific-resistance (< 0.15 Ω cm2) at around 350 °C that was small enough for the practical fuel cell application. The sub-100 nm-thick membranes of Hf0.13Si0.87Ox, could be fabricated on porous Pt/alumina substrate to provide gas concentration cells. The electromotive force observed with H2 concentration cell indicated that the ceramic nanomembrane acted as predominant proton conductor without permeation of H2 gas. In addition, the Hf0.13Si0.87Ox and Zr0.11Si0.89Ox membranes responded to the change of O2 pressures in O2 concentration cells, while the Al0.16Si0.84Ox and Ce0.06Si0.94Ox membranes did not produce the electrical voltage by gradient of O2 pressure. We conclude that Hf0.13Si0.87Ox nanomembrane is promising as electrolyte material for fuel cells and related ionics devices.
| Original language | English |
|---|---|
| Pages (from-to) | 115-121 |
| Number of pages | 7 |
| Journal | Solid State Ionics |
| Volume | 181 |
| Issue number | 3-4 |
| DOIs | |
| Publication status | Published - Feb 24 2010 |
| Externally published | Yes |
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All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics
Cite this
Ion-conducting, sub-100 nm-thick film of amorphous hafnium silicate. / Aoki, Yoshitak; Habazaki, Hiroki; Kunitake, Toyoki.
In: Solid State Ionics, Vol. 181, No. 3-4, 24.02.2010, p. 115-121.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Ion-conducting, sub-100 nm-thick film of amorphous hafnium silicate
AU - Aoki, Yoshitak
AU - Habazaki, Hiroki
AU - Kunitake, Toyoki
PY - 2010/2/24
Y1 - 2010/2/24
N2 - Ceramic electrolytes operating in the temperature range of 200 to 500 °C under dry atmosphere are a key material for the next-generation fuel cell and related applications. We discovered that nanometer-thick films of amorphous hafnium silicate (HfnSi1 - nOx) exhibited efficient ionic conduction at 100-400 °C in dry air. When the fraction of hafnium doping was around 0.1, the nanofilm showed a low area-specific-resistance (< 0.15 Ω cm2) at around 350 °C that was small enough for the practical fuel cell application. The sub-100 nm-thick membranes of Hf0.13Si0.87Ox, could be fabricated on porous Pt/alumina substrate to provide gas concentration cells. The electromotive force observed with H2 concentration cell indicated that the ceramic nanomembrane acted as predominant proton conductor without permeation of H2 gas. In addition, the Hf0.13Si0.87Ox and Zr0.11Si0.89Ox membranes responded to the change of O2 pressures in O2 concentration cells, while the Al0.16Si0.84Ox and Ce0.06Si0.94Ox membranes did not produce the electrical voltage by gradient of O2 pressure. We conclude that Hf0.13Si0.87Ox nanomembrane is promising as electrolyte material for fuel cells and related ionics devices.
AB - Ceramic electrolytes operating in the temperature range of 200 to 500 °C under dry atmosphere are a key material for the next-generation fuel cell and related applications. We discovered that nanometer-thick films of amorphous hafnium silicate (HfnSi1 - nOx) exhibited efficient ionic conduction at 100-400 °C in dry air. When the fraction of hafnium doping was around 0.1, the nanofilm showed a low area-specific-resistance (< 0.15 Ω cm2) at around 350 °C that was small enough for the practical fuel cell application. The sub-100 nm-thick membranes of Hf0.13Si0.87Ox, could be fabricated on porous Pt/alumina substrate to provide gas concentration cells. The electromotive force observed with H2 concentration cell indicated that the ceramic nanomembrane acted as predominant proton conductor without permeation of H2 gas. In addition, the Hf0.13Si0.87Ox and Zr0.11Si0.89Ox membranes responded to the change of O2 pressures in O2 concentration cells, while the Al0.16Si0.84Ox and Ce0.06Si0.94Ox membranes did not produce the electrical voltage by gradient of O2 pressure. We conclude that Hf0.13Si0.87Ox nanomembrane is promising as electrolyte material for fuel cells and related ionics devices.
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UR - http://www.scopus.com/inward/citedby.url?scp=77649188422&partnerID=8YFLogxK
U2 - 10.1016/j.ssi.2009.02.016
DO - 10.1016/j.ssi.2009.02.016
M3 - Article
AN - SCOPUS:77649188422
VL - 181
SP - 115
EP - 121
JO - Solid State Ionics
JF - Solid State Ionics
SN - 0167-2738
IS - 3-4
ER -