臺灣博碩士論文加值系統

近幾年來,氣體感測器逐漸地被研究開發。對於一氧化碳氣體感測器，已
由研發階段進入商業化過程,商業化一氧化碳氣體感測器，多以白金為電
極。本研究以白金/碳多孔性擴散電極及硫酸、磷酸電解質，進行一氧化
碳感測元件的製備。實驗中電極的製備法是以白金/碳粉粒和鐵氟龍混合
成電極並熱壓在碳紙上。在不同條件下製備的電極以定電位法分析一氧化
碳的感測行為,在極限電流範圍內，可獲得一氧化碳濃度與淨反應電流的
線性關係。在電位0V (vs. Pt)時，反應達極限電流。在0V∼0.1V(vs.Pt)
的範圍內，提供了感測元件的重複性與精確性。在尋求最佳的電極製備條
件下,發現鐵氟龍載量比為0.7 ，熱壓溫度為 330℃時,可獲取最佳的感測
靈敏度為0.906uA/ppm。在氣體流速120cm/min以上時,一氧化碳的淨反應
電流趨於平穩而不再受流速影響。電極在一個月的長期測試中,也獲致良
好的穩定性及重覆性。此外，不同條件下製備的感測元件,其最佳的起始
時間為15秒至30秒，應答時間為200至500秒。

In rencent years, the gas sensors have been invstigated and
designed. The gas sensors of carbon monoxide also have been
commercialized. For carbon monoxide sensor, the platinum metal
have been used as electrode, In this investigation, The Pt/C
diffution commonly used in fuel cell, rather than Pt electrode
Furthermor were changed to sulfuric acid and phosphoric acid.
In this investigation,the electrode were prepared by mixing the
carbon-supported platinum with teflon binder, then press onto
carbon paper. The sensing behaviors of CO were analyzed with
potentiometric method. For the electrodes prepared under
serious preparation conditions. The limiting current was
reached at about 0V(vs.Pt). Therefore, this investigation
system offered a high