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用厚膜技术制备了用于氧传感器的多孔铂电极。这种多孔铂电极浆料由纳米铂粉、银粉、氧化钇掺杂的氧化锆纳米粉末和有机载体组成。利用场发射扫描电镜研究了浆料的无机成分对烧成的铂电极微结构的影响。研究了组分对铂电极的过电位和传感器电阻的影响。结果表明:由纳米铂粉、银粉和氧化钇掺杂的氧化锆纳米粉组成的铂电极呈现疏松的海绵结构,并且过电位较低;使用同样量的三氧化二铋或硼硅酸玻璃釉代替银粉时,铂电极的电阻明显增加。使用银粉做黏结剂时,铂电极的电阻比使用同样量的三氧化铋或硼硅酸玻璃釉做黏结剂时要低。
A porous platinum electrode for oxygen sensor was prepared by thick film technique. This porous platinum electrode paste consists of nano-platinum powder, silver powder, yttrium oxide doped zirconia nano powder and organic carrier. Field emission scanning electron microscopy was used to study the effect of slurry composition on the microstructure of fired Pt electrode. The influence of the composition on the overpotential of the platinum electrode and the resistance of the sensor was investigated. The results show that the platinum electrode composed of nano-sized platinum powder, silver powder and yttria-doped zirconia nanopowder has a loose sponge structure with low overpotential. The same amount of bismuth oxide or borosilicate glass glaze is used instead Silver powder, the platinum electrode resistance increased significantly. When silver powder is used as the binder, the resistance of the platinum electrode is lower than when using the same amount of bismuth trioxide or borosilicate glass glaze as the binder.