| Budget Amount *help |
¥16,770,000 (Direct Cost: ¥12,900,000、Indirect Cost: ¥3,870,000)
Fiscal Year 2016: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2015: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2014: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2013: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
|
|---|
| Outline of Final Research Achievements |
Anion exchange membranes are widely viewed as promising candidates for the electrolyte component; however, the operating temperature of these membranes has been limited to 80 °C. The U.S. Department of Energy has recommended development of fuel cells capable of operating at temperatures up to 120 °C to reduce the cost of fuel cell vehicles. Here, we report SnP2O7-based hydroxide ion conductors and an intermediate-temperature fuel cell with the optimized electrolyte component. Hydroxide ion exchange capability was introduced into the bulk of SnP2O7 by the partial substitution of Sn4+ cations with high valency cations, such as Sb5+, Nb5+, V5+, and Ta5+. Consequently, Sn0.92Sb0.08P2O7 exhibited the highest hydroxide ion conductivity of 0.04 S cm-1 at 200 °C. Furthermore, a H2/air fuel cell with this membrane generated a power density of 147 mW cm-2 at 200°C. Notably, this membrane could also be utilized as the electrolyte component for rechargeable aluminum-air batteries.
|
