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Effect of Oxidation Temperature on Photo-catalytic Properties of Stainless Steel Coated by Copper Oxide

机译：氧化温度对氧化铜涂层不锈钢光催化性能的影响

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摘要

Copper oxide (Cu-oxide) electrodes were produced by the vacuum deposition of pure copper on a stainless steel substrate, followed by oxidation in air between 150 and 550℃. The potentials and durability of the Cu-oxide electrodes under xenon light irradiation were evaluated,and the effects of the microstructure on the electrode performance were discussed. The photocatalytic effect of a p-type semiconductor in a Cu-oxide electrode was confirmed for all treatment temperatures. Electrodes oxidized at 150℃ showed a very weak photocatalytic effect because the main phase of the thin film comprised amorphous Cu. The potentials of the electrodes oxidized at 450 and 550℃ shifted to more than 230 mV (SCE) after light irradiation but they immediately decreased to 100 mV (SCE) due to the self-corrosion (photo-corrosion) of CuO. The electrodes oxidized at 250 and 350℃ retained their photocatalytic activities at irradiation time of more than 24 h. The initial potentials of the electrodes oxidized at 250 and 350℃ are 100 mV (SCE) and 280 mV (SCE), respectively. The potential of the electrode oxidized at 250℃ increased with time because Cu_2O, which was the initial main phase of the electrode, was oxidized to CuO by a surface reaction during irradiation. In the electrode oxidized at 350℃, the photo-excited electrons and the photo-generated holes hardly reacted with the electrode surface by the interactions between the Cu-oxide film and the passive film of stainless steel substrate. The electrode exhibited the best performance in terms of potential and durability during the light irradiation.
机译：通过将纯铜真空沉积在不锈钢基板上，然后在150至550℃的空气中氧化来生产氧化铜（Cu-oxide）电极。评价了氙气辐射下Cu-氧化物电极的电势和耐久性，讨论了微观结构对电极性能的影响。在所有处理温度下都证实了p型半导体在Cu-氧化物电极中的光催化作用。在150℃下氧化的电极显示出非常弱的光催化作用，因为薄膜的主相包含非晶态Cu。光照射后，在450和550℃氧化的电极电位移至230 mV（SCE）以上，但由于CuO的自腐蚀（光腐蚀），其电位立即降至100 mV（SCE）。在250和350℃氧化的电极在超过24小时的照射时间仍保持光催化活性。在250和350℃下氧化的电极的初始电势分别为100 mV（SCE）和280 mV（SCE）。在250℃下氧化的电极电位随时间增加，这是因为作为初始电极主相的Cu_2O在辐照过程中通过表面反应被氧化为CuO。在350℃下氧化的电极中，由于Cu-氧化膜与不锈钢基体钝化膜之间的相互作用，光激发电子和光生空穴几乎不与电极表面反应。就光照射期间的电位和耐久性而言，电极表现出最佳性能。

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  • 来源
    《ISIJ international》 |2017年第9期|1609-1616|共8页
  • 作者

    Motoaki MORITA; Kengo KISHIHARA; Shinichi MOTODA; Norimitsu KOGA; Tadashi SHINOHARA;

  • 作者单位

    Tokyo University of Marine Science and Technology, 2-1-6 Etujima, Koto-Ku, Tokyo, 135-8533 Japan;

    Tokyo University of Marine Science and Technology, 2-1-6 Etujima, Koto-Ku, Tokyo, 135-8533 Japan;

    Tokyo University of Marine Science and Technology, 2-1-6 Etujima, Koto-Ku, Tokyo, 135-8533 Japan;

    Yokohama National University, 79-5 Tokiwadai, Hodogaya-Ku, Yokohama, 240-8501 Japan;

    National Institute for Materials Science, 1-2-1 Sengen, Tsukuba-shi, Ibaraki, 305-0047 Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    photocathode; photo-corrosion; cuprous oxide; cupric oxide; p-p junction; passive film.;

    机译：光电阴极光腐蚀氧化亚铜氧化铜p-p结;被动膜。;

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