氧化钯作为电位型传感器中敏感电极的工作机理

doi:10.3866/PKU.WHXB201612122

物理化学学报 >> 2017, Vol. 33 >> Issue (3): 573-581.doi: 10.3866/PKU.WHXB201612122

氧化钯作为电位型传感器中敏感电极的工作机理

郑雁公^1,*(),朱丽娜¹,李晗宇¹,简家文^1,*(),杜海英²

¹ 宁波大学信息科学与工程学院,浙江宁波 315000
² 大连民族大学机电工程学院,辽宁大连 116600

收稿日期:2016-10-24 发布日期:2017-03-07
通讯作者: 郑雁公,简家文 E-mail:zhengyangong@nbu.edu.cn;jianjiawen@nbu.edu.cn
基金资助:
国家自然科学基金(61471210);国家自然科学基金(61501271);国家自然科学基金(51472126);宁波市自然科学基金(2015A610108);宁波大学王宽诚幸福基金资助项目

Operating Mechanism of Palladium Oxide as a Potentiometric Sensing Electrode

Yan-Gong ZHENG^1,*(),Li-Na ZHU¹,Han-Yu LI¹,Jia-Wen JIAN^1,*(),Hai-Ying DU²

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

Received:2016-10-24 Published:2017-03-07
Contact: Yan-Gong ZHENG,Jia-Wen JIAN E-mail:zhengyangong@nbu.edu.cn;jianjiawen@nbu.edu.cn
Supported by:
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

摘要/Abstract

摘要：

研究了基于氧化钯(PdO)电极的电位型传感器的敏感特性,并探讨了其敏感机理.首先,利用Mg、Ni和La元素对PdO电极进行掺杂,将掺杂后的PdO电极印刷在氧化锆电解质上,制备成电位型传感器,并对一氧化碳(CO)的敏感特性进行了测试.由于掺杂后的PdO电极表面缺陷增加,这有利于对CO的吸附,有效地提高了传感器的灵敏度.其次,为了探究敏感信号的来源, PdO电极分别印刷在氧化铝和沸石基片上,同样测试了对CO的敏感特性.其中PdO电极与沸石所组成的电位型传感器对CO浓度可以产生阶梯型响应.最后,对传感器分别进行了电阻和阻抗谱的测量,测量结果表明:传感器的响应可以归因于电极和电解质之间界面电位的变化.综合上述研究结果,建立了电偶层模型来解释基于PdO电极的电位型传感器的工作机理.

关键词: 氧化钯, 电位型传感器, 掺杂作用, 一氧化碳, 电解质

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.

Key words: Palladium oxide, Potentiometric sensor, Doping effect, Carbon monoxide, Electrolyte

MSC2000:

O646

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郑雁公,朱丽娜,李晗宇,简家文,杜海英. 氧化钯作为电位型传感器中敏感电极的工作机理[J]. 物理化学学报, 2017, 33(3): 573-581.

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 Phys. -Chim. Sin., 2017, 33(3): 573-581.

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氧化钯作为电位型传感器中敏感电极的工作机理

Operating Mechanism of Palladium Oxide as a Potentiometric Sensing Electrode

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