物理化学学报2017，Vol.33Issue(3)：573-581,9.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
Operating Mechanism of Palladium Oxide as a Potentiometric Sensing Electrode
摘要
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.关键词
氧化钯/电位型传感器/掺杂作用/一氧化碳/电解质Key words
Palladium oxide/Potentiometric sensor/Doping effect/Carbon monoxide/Electrolyte分类
化学化工引用本文复制引用
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):573-581,9.基金项目
The project was supported by the National Natural Science Foundation of China (61471210,61501271,51472126),Natural Science Foundation of Ningbo Municipality,China (2015A610108),and K.C.Wong Magna Fund in Ningbo University,China.国家自然科学基金(61471210,61501271,51472126),宁波市自然科学基金(2015A610108)及宁波大学王宽诚幸福基金资助项目 （61471210,61501271,51472126）
