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首页> 外文期刊>Sensors and Actuators >Co_3O_4—A systematic investigation of catalytic and gas sensing performance under variation of temperature, humidity, test gas and test gas concentration
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Co_3O_4—A systematic investigation of catalytic and gas sensing performance under variation of temperature, humidity, test gas and test gas concentration

机译：Co_3O_4-在温度，湿度，测试气体和测试气体浓度变化下的催化和气体传感性能的系统研究

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摘要

A "new" gas sensing material; Co_3O_4, which is mainly known as a good catalyst for CO combustion, was investigated by means of resistance and catalytic conversion measurements. A systematic screen of sensors with sensitive layers of undoped, 0.2 wt% Pd- and Pt-doped Co_3O_4 was done by variation in temperature, humidity, test gas, and test gas concentration. It was found that all three kinds of materials show best response to EtOH (sensor signals up to 28,000 @ 100℃, 0% r.h., 90ppm), good response to CO (sensor signals up to 100 ® 100℃, 0% r.h., 50ppm), but only a marginal response to CH_4 exposure, in particular at 50% r.h. The occurrence of maxima in sensor signals at 50% r.h. indicates a change in the surface reaction mechanism for both EtOH (175-200℃) and CO exposure (125-150℃). The 0.2 wt% Pt-doped sensors display superior gas sensing properties concerning recovery times and sensor signal height as well as a higher overall catalytic conversion. Additionally, at 0% r.h. and under exposure to CO a comparison with the benchmark material SnO_2 @300℃ reveals even higher sensor signals for Co_3O_4 @100℃.
机译：一种“新的”气体传感材料；通过电阻和催化转化率测量研究了Co_3O_4（主要被认为是CO燃烧的良好催化剂）。通过改变温度，湿度，测试气体和测试气体浓度，对敏感层为未掺杂的，Pd和Pt掺杂的Co_3O_4的敏感层进行了系统的传感器筛选。结果发现，这三种材料对EtOH的响应最佳（传感器信号在100℃时高达28,000 @，0％rh，90ppm），对CO的响应良好（在100®100℃的传感器信号中，相对于0％rh，50ppm的传感器信号） ），但仅对CH_4暴露有少量反应，尤其是在相对湿度50％时相对于50％r.h的传感器信号出现最大值。表示EtOH（175-200℃）和CO暴露（125-150℃）的表面反应机理都发生了变化。掺有0.2 wt％的Pt的传感器在恢复时间和传感器信号高度以及更高的总催化转化率方面显示出优异的气体传感性能。另外，相对湿度为0％。在暴露于一氧化碳的情况下，与基准材料SnO_2 @ 300℃的比较显示，在100℃时，Co_3O_4的传感器信号更高。

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  • 来源
    《Sensors and Actuators》 |2013年第8期|644-650|共7页
  • 作者

    Susanne Wicker; Katharina Groβmann; Nicolae Barsan; Udo Weimar;

  • 作者单位

    Tuebingen University, Faculty of Science, Department of Chemistry, Institute of Physical and Theoretical Chemistry, Auf der Morgenstelle 15, 72076 Tuebingen, Germany;

    New Cosmos, Product Development, Sensors Technologies Croup, 2-5-4 Mitsuya-naka. Yodogawa-ku. Osaka 532-0036,Japan;

    Tuebingen University, Faculty of Science, Department of Chemistry, Institute of Physical and Theoretical Chemistry, Auf der Morgenstelle 15, 72076 Tuebingen, Germany;

    Tuebingen University, Faculty of Science, Department of Chemistry, Institute of Physical and Theoretical Chemistry, Auf der Morgenstelle 15, 72076 Tuebingen, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Co_3O_4; Gas sensor; Catalytic conversion; Resistance measurement; Doping; Humidity;

    机译：Co_3O_4;气体传感器催化转化;电阻测量;掺杂湿度;

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