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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.

以β-二酮配合物为前驱体，采用化学气相沉积法制备了贵金属(Ir或Ru)纳米复合薄膜，并对其微观结构和气敏电极性能进行了研究。Ir-YSZ纳米复合电极由直径为5~10 nm的非晶态YSZ和Ir颗粒组成。由于YSZ与Ir在纳米复合电极中的接触面积较大，且Ir纳米粒子具有较高的催化活性，Ir-YSZ电极的界面电导率几乎是溅射铂电极的1000倍。由Ir-YSZ电极和YSZ电解液组成的氧浓差电池的电动势符合能斯特理论值，在650℃下的响应时间为10-20s。采用MOCVD法制备了碳含量约为50%的Ir-C和Ru-C纳米复合薄膜，并对其微观结构和电极性能进行了研究。直径为5~20 nm的Ir或Ru颗粒分散在非晶态C基质中。1R-C或Ru-C复合电极与YSZ电解液之间界面电荷转移的交流电导比铂电极的交流电导高100-1000倍。由纳米复合电极和YSZ电解液组成的氧气浓缩池的电动势在500K附近的低温下符合能斯特理论值，Ir-C在550K时的响应时间为110 S，Ru-C纳米复合电极在500K时的响应时间为900 S。