Highly conductive proton-conducting electrolyte with a low sintering temperature for electrochemical ammonia synthesis |
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| Affiliation: | 1. Union Research Center of Fuel Cell, School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, PR China;2. School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, GA 30332, USA |
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| Abstract: | BaCe0·7Zr0.1Gd0.2O3-δ (BCZG) powder is synthesized by a citrate sol-gel method, and different amounts of Li2CO3 are introduced to lower the sintering temperature. The densification temperature of BCZG ceramic is decreased drastically to 1250 °C by using Li2CO3 as sintering aid. BCZG with 2.5 wt% of Li2CO3 (BCZG-2.5L) can not only remarkably promote the sintering process of BCZG but also enhance its electrical conductivity. The total ionic conductivity of BCZG-2.5L attains to 1.9 × 10?2 S cm?1 at 600 °C in a wet H2 atmosphere. Ammonia synthesis at atmospheric pressure is conducted on (2K, 10Fe)/Ni-BCZG | BCZG-2.5L | Ni-BCZG electrolytic cell with an applied voltage of 0.2–1.6 V at a temperature of 450–600 °C. The highest NH3 formation rate of 1.87 × 10?10 mol s?1 cm?2 and the highest current efficiency of 0.53% is achieved at 500 °C with an applied voltage of 0.8 V. |
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| Keywords: | Proton conductor Sintering Electrochemical ammonia synthesis |
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