Publication date: 10th April 2024
This study explores the sintering behavior of Ba7Nb4MoO20 materials (BNM) with the addition of B2O3 (1 - 3 wt%) to enhance low-temperature sintering, addressing the challenges posed by secondary phases at high sintering temperatures that significantly degrade proton conductivity. By employing 3 wt% of B2O3 as a sintering aid, it was possible to achieve a sintering density of 98% at a reduced temperature of 1200°C in just one hour. Investigations into the conductivity properties of BNM by AC impedance spectroscopy revealed a distinct trade-off: while bulk conductivity increased at lower sintering temperatures, grain boundary conductivity decreased. These findings underscore the delicate balance needed when using sintering aids in the manufacture of electrolytes, suggesting avenues for optimizing the amount of sintering additives and sintering temperatures to maintain high performance in their applications. This research opens discussions on optimal sintering conditions in BNM electrolyte production, paving the way for further innovation in electrolytic materials technology.
This was supported by New Energy Core Technology Development Project (No.20223030040080) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, Industry and Energy. This work was also supported by Research and Development Program of the Korea Institute of Energy Research (Grant number C4-2407).