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    • 5. 发明公开
    • Hydrocarbon sensor and method of producing the same
    • Kohlenwasserstoffsensor和Methode zu dessen Herstellung
    • EP1041380A2
    • 2000-10-04
    • EP00106922.8
    • 2000-03-31
    • MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    • Taniguchi, Noboru
    • G01N27/407
    • G01N33/0047G01N27/4074
    • A limiting-current-type hydrocarbon sensor comprising a solid electrolyte formed of a barium-cerium-based oxide, capable of detecting hydrocarbon stably and accurately regardless of whether no oxygen is present or a high concentration of oxygen is present. The cathode on the surface of the solid electrolyte is formed of an alloyed layer including Au and Al. In particular, an alloyed layer including an Al-Au intermediate phase is suited for the alloyed layer of the cathode. The alloyed layer comprises a first layer including an Al-Au intermediate phase and making contact with the surface of the solid electrolyte and a second layer including a metal Al phase and covering the first layer. The Al phase of the alloyed layer blocks oxygen, and the Al-Au intermediate phase smoothens hydrogen association and reduces the resistance of the electrode. The hydrocarbon sensor can thus detect hydrocarbon accurately even when oxygen is included in an atmosphere.
    • 包含由钡 - 铈系氧化物形成的固体电解质的极限电流型烃传感器,其能够稳定且准确地检测碳氢化合物,而不管是否存在氧气或高浓度的氧气。 固体电解质表面的阴极由包含Au和Al的合金层形成。 特别地,包含Al-Au中间相的合金层适用于阴极的合金化层。 合金层包括包含Al-Au中间相并与固体电解质的表面接触的第一层和包含金属Al相的第二层并覆盖第一层。 合金层的Al相阻挡氧,Al-Au中间相平滑氢缔合并降低电极的电阻。 因此,即使在大气中包含氧气的话,烃传感器也能够精确地检测烃。