Kyushu University in Japan has developed a proton (H+) conductive electrolyte BaZr0.4Sc0.6O3-δ for solid oxide fuel cell (SOFC), which can work at a moderate temperature of 400℃.
The electrolyte material used for SOFC must have the following characteristics: the total proton conductivity, including the inside of the grains and the grain boundaries, is higher than 0.01 S/cm, and relative to the hydrogen, oxygen, carbon dioxide and hydrogen contained in the fuel cell operating environment Water vapor and other properties are stable.
The research team added scandium to barium zirconate (BaZrO3) at a very high concentration of 60%. At the target temperature of 400 ℃ for fuel cell operation, the total proton conductivity, including the inside of the grain and the grain boundary, exceeded 0.01S/ cm. In addition, it has been proved that such high proton conductivity can be maintained for 200 hours at a temperature of 400°C, and can be stably maintained for more than 240 hours at a temperature of 400°C and a 98% high concentration carbon dioxide atmosphere.
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