Development of noble metal nano-composite electrode for gas sensors

气体传感器用贵金属纳米复合电极的研制

基本信息

批准号：
13555184
负责人：
GOTO Takashi
金额：
$ 5.12万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

Noble metal(Ir or Ru) nano-composite films were synthesized by chemical vapor deposition using beta-diketonato complexes as precursors, and their microstructures and electrode properties for gas sensors were studied. Ir-YSZ nano-composite electrodes consisted of amorphous YSZ and Ir particles of 5-10 nm in diameter. The interfacial conductivity for the Ir-YSZ electrodes was almost 1000 times higher than that of sputtered-Pt electrodes due to large contact area between YSZ and Ir in nano-composite electrodes and high catalytic activity of Ir nano-particles. The electro-motive-force values of the oxygen concentration cell constructed from the Ir-YSZ electrodes and YSZ electrolyte showed the Nernstian theoretical values and the response time was 10-20s at 650℃. Ir-C and Ru-C nano-composite films containing about 50 vol% of carbon were prepared by MOCVD, and their microstructures and electrode properties were investigated. Ir or Ru particles of 5-20 nm in diameter were dispersed in amorphous C matrix. The AC conductivities associating to the interface charge transfer between 1r-C or Ru-C composite electrode and YSZ electrolyte were 100-1000 times higher than that of Pt electrodes. The emf values of the oxygen gas concentration cell constructed from the nano-composite electrodes and YSZ electrolyte showed the Nernstian theoretical values at low temperatures around 500 K. The response time of the concentration cell was 110 s at 550 K for Ir-C and 900 s at 500 K for Ru-C nano-composite electrodes.

贵金属（IR或RU）纳米复合膜是通过化学蒸气沉积使用β-二甲酸酯络合物作为前体合成的，其微结构和电极特性的气体传感器进行了研究。 IR-ysz纳米复合材料电极由直径为5-10 nm的无定形YSZ和IR颗粒组成。由于纳米复合电极中YSZ和IR之间的较大接触面积和IR纳米颗粒的高催化活性，IR-YSZ电极的界面电导率比溅射-PT电极高的1000倍。由IR-ysz电极和YSZ电解质构成的氧浓度细胞的电 - 力量值显示了Nernstian理论值，响应时间为10-20s，在650℃时为10-20。 MOCVD制备了含有约50卷碳的IR-C和RU-C纳米复合膜，并投资了它们的微结构和电极性能。直径为5-20 nm的IR或RU颗粒分散在无定形C基质中。 1R-C或RU-C复合电极和YSZ电解质之间的界面电荷转移的交流电导率比PT电极高100-1000倍。由纳米复合材料电极和YSZ电解质构建的氧气浓度池的EMF值在低温约为500 K的低温下显示了Nernstian理论值。对于RU-C Nano-Compomposite电极，IR-C的浓度电池的响应时间为110 s，IR-C的550 K，在500 K时为900 s。