A solid-state particulate matter sensor based on electrochemical oxidation of carbon by active oxygen
A solid-state particulate matter sensor based on electrochemical oxidation of carbon by active oxygen
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DOI：
10.1016/j.snb.2011.12.057
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发表时间：
2012-02-20
影响因子：
8.4
通讯作者：
Hibino, T.
中科院分区：
文献类型：
--
作者：
Shen, Y. B.;Harada, T.;Hibino, T.
在200℃的工作温度下，研究了以坚固的SnP2O7-SnO2复合陶瓷为固体电解质的电化学传感器的碳氧化活性和传感性能。通过四电子反应(C+2H(2)O->；CO2+4H(+)+4E(-))，实现了电化学生成的活性氧对碳的特定反应。然而，该反应并没有发生在整个电极层上，这导致了灵敏度低和响应速度慢。这个问题可以通过在工作电极上以几微米的水平分布SnP2O7离聚体来克服。此外，本传感器在实际应用中的另一个好处是，当检测到样品气体中的碳含量为1000ppm CO和1000ppm C3H8时，几乎不会遇到干扰。由此产生的安培模式传感器可以成功地产生与台架测试设备中的颗粒物(PM)数量相对应的电流信号。这些结果表明，该传感器能够在自再生的同时对PM浓度进行连续监测。(C)2011爱思唯尔B.V.保留所有权利。
The carbon oxidation activity and sensing performance of an electrochemical sensor incorporating a robust SnP2O7-SnO2 composite ceramic as a solid electrolyte were investigated at an operating temperature of 200 degrees C. Specific reactivity of the electrochemically formed active oxygen toward carbon was accomplished with a high current efficiency estimated from the four-electron reaction (C + 2H(2)O --> CO2 + 4H(+) + 4e(-)). However, this reaction did not occur over the entire electrode layer, which resulted in low sensitivity and a slow response speed. This problem could be overcome by distributing a SnP2O7 ionomer over the working electrode at a level of several micrometers. Moreover, an additional benefit of the present sensor for practical applications is that little interference was encountered when sensing carbon at levels of 1000 ppm CO and 1000 ppm C3H8 in the sample gas. The resulting ampermetric mode sensor could successfully produce a current signal that corresponded to the quantity of particulate matter (PM) in the bench test apparatus. These results demonstrate that the present sensor is able to continuously monitor the PM concentration while self-regenerating. (C) 2011 Elsevier B.V. All rights reserved.