| 氧化钯作为电位型传感器中敏感电极的工作机理 |
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| 作者单位： | 1. Faculty of Electrical Engineering and Computer Science, Ningbo University, Ningbo 315000, Zhejiang Province, P. R. China;2. College of Mechanical and Electronic Engineering, Dalian Minzu University, Dalian 116600, Liaoning Province, P. R. China |
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| 基金项目： | The project was supported by the National Natural Science Foundation of China(61471210);The project was supported by the National Natural Science Foundation of China(61501271);The project was supported by the National Natural Science Foundation of China(51472126);Natural Science Foundation ofNingbo Municipality, China(2015A610108);K. C. Wong Magna Fund in Ningbo University, China |
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| 摘 要： |
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| 关 键 词： | 氧化钯 电位型传感器 掺杂作用 一氧化碳 电解质 |
| 收稿时间： | 2016-10-24 |
Operating Mechanism of Palladium Oxide as a Potentiometric Sensing Electrode |
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| Yan-Gong ZHENG,Li-Na ZHU,Han-Yu LI,Jia-Wen JIAN,Hai-Ying DU. Operating Mechanism of Palladium Oxide as a Potentiometric Sensing Electrode[J]. Acta Physico-Chimica Sinica, 2017, 33(3): 573-581. DOI: 10.3866/PKU.WHXB201612122 |
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| Authors: | Yan-Gong ZHENG Li-Na ZHU Han-Yu LI Jia-Wen JIAN Hai-Ying DU |
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| Affiliation: | 1. Faculty of Electrical Engineering and Computer Science, Ningbo University, Ningbo 315000, Zhejiang Province, P. R. China;2. College of Mechanical and Electronic Engineering, Dalian Minzu University, Dalian 116600, Liaoning Province, P. R. China |
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| Abstract: | This paper describes the sensing properties of a potentiometric sensor based on a palladium oxide (PdO) electrode. Our investigation of the sensing mechanism is also discussed. We studied carbon monoxide (CO) sensing performance of a PdO electrode doped with Mg, Ni, and La, printed on zirconia. The results indicated that defects on the surface of PdO, which allow adsorption of CO, can effectively enhance the sensitivity of the sensors. To explore the source of the signal, a PdO-based electrode was printed on an alumina disc and a zeolite pellet for CO detection at 450℃. Notably the zeolite coupled with the PdO-based electrode to generate potentiometric responses to changes in CO concentration. According to the resistance and impedance measurements, the response to CO was ascribed to the changing interfacial potential between the PdO electrode and electrolyte. A model based on an electrochemical double layer between the PdO and electrolyte was determined to explain the behavior of the potentiometric sensor. It may be possible to harness these effects at PdO electrodes for the development of electrochemical sensors. |
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| Keywords: | Palladium oxide Potentiometric sensor Doping effect Carbon monoxide Electrolyte |
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