Design of a highly sensitive and responsive electrode for particulate matter monitoring
Design of a highly sensitive and responsive electrode for particulate matter monitoring
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DOI：
10.1016/j.snb.2010.10.042
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发表时间：
2011-03-31
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.;Takeuchi, T.;Hibino, T.
在之前基于 Pt 垂直棒 Sn0.9In0.1P2O7 垂直棒 Pt 电极系统的传感器装置中，在工作电极表面实现了电化学碳氧化，从而实现了连续碳监测和传感器的自我再生。活性氧物质对碳的比反应性以及高电流效率得到了证明。然而，这种反应并未发生在整个电极层上，限制了传感性能并导致灵敏度和响应速度较低。碳氧化仅限于表面区域的主要原因是工作电极缺乏质子传导。为了克服这个问题，我们在工作电极中添加了质子传导 Sn0.9In0.1P2O7 颗粒作为离聚物。 Sn0.9In0.1P2O7离聚物成功地以几微米的水平分布在工作电极上，为整个电极层上的碳氧化提供了反应位点。根据碳氧化停止时的电流确定，所得电流传感器对碳的灵敏度比不含离聚物的工作电极高 1.4 倍。此外，漂浮在玻璃容器中的碳可以被输送到工作电极外表面的反应位点，从而实现大电流和快速响应。 (C) 2010 Elsevier B.V. 保留所有权利。
In a previous sensor device based on a Pt vertical bar Sn0.9In0.1P2O7 vertical bar Pt electrode system, electrochemical carbon oxidation was realized over the surface of a working electrode, enabling continuous carbon monitoring with self-regeneration of the sensor. Specific reactivity of the active oxygen species for carbon was demonstrated along with a high current efficiency. However, this reaction did not occur over the entire electrode layer, limiting the sensing properties and giving a low sensitivity and response speed. The main reason for carbon oxidation being limited to the surface region was the lack of proton conduction in the working electrode. To overcome this problem, we added proton-conducting Sn0.9In0.1P2O7 particles as an ionomer to the working electrode. The Sn0.9In0.1P2O7 ionomer was successfully distributed over the working electrode at the level of a few micrometers, providing reaction sites for carbon oxidation over the entire electrode layer. The resulting amperometric sensor provided a sensitivity to carbon that was 1.4 times greater than that of the ionomer-free working electrode, as determined by the current at which carbon oxidation had ceased. Moreover, carbon floating in a glass container could be transported to reaction sites present on the external surface of the working electrode, allowing for a large current and a rapid response. (C) 2010 Elsevier B.V. All rights reserved.