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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-二酮基配合物为前驱体，采用化学气相沉积法制备了贵金属（Ir或Ru）纳米复合薄膜，并研究了其微结构和气敏电极性能。Ir-YSZ纳米复合电极由非晶态YSZ和直径为5-10 nm的Ir颗粒组成。由于纳米复合电极中YSZ和Ir之间的大接触面积和Ir纳米颗粒的高催化活性，Ir-YSZ电极的界面电导率几乎是掺杂Pt电极的1000倍。由Ir-YSZ电极和YSZ电解质组成的氧浓差电池在650℃时的电动势值符合能斯特理论值，响应时间为10- 20 s。采用MOCVD方法制备了碳含量约为50vol%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。在非晶碳基体中分散有直径为5-20 nm的Ir或Ru颗粒。与1 r-C或Ru-C复合电极与YSZ电解质之间的界面电荷转移相关的交流电导率比Pt电极高100-1000倍。由纳米复合电极和YSZ电解质构成的氧气浓差电池在500 K左右的低温下的电动势值符合能斯特理论值。浓差电池的响应时间为110 s在550 K的Ir-C和900 s在500 K的Ru-C纳米复合电极。