Show simple item record

dc.contributor.author王世忠zh_CN
dc.contributor.author江义zh_CN
dc.contributor.author张雅虹zh_CN
dc.contributor.author阎景旺zh_CN
dc.contributor.author李文钊zh_CN
dc.contributor.authorWang Shizhongzh_CN
dc.contributor.authorJiang Yi
dc.contributor.authorZhang Yahong
dc.contributor.authorYan Jingwang
dc.contributor.authorLi Wenzhao
dc.date.accessioned2013-11-18T07:44:03Z
dc.date.available2013-11-18T07:44:03Z
dc.date.issued1998-08-28zh_CN
dc.identifier.citation电化学,1998,4(03):252-259.zh_CN
dc.identifier.issn1006-3471zh_CN
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/57369
dc.description.abstract用交流阻抗方法研究了La0.8Sr0.2MnO3(LSM)电极上进行的氧电化学还原反应.实验表明反应速度控制步骤(rds)随反应温度、氧分压及过电位发生显著变化.近平衡下反应的rds为氧的解离吸附过程.强阳极极化下,电解质表面产生大量电子空穴;强阴极极化下,LSM电极表面形成大量氧空位,二者的结果均使界面电导增加,电化学反应区扩展.低温强极化及高温强阳极极化下反应的rds为氧的电荷转移过程,高温强阴极极化下为氧的表面扩散过程zh_CN
dc.description.abstractElectrochemical reaction of oxygen on the La 0.8 Sr 0.2 MnO 3/YSZ electrode has been investigated in detail with AC impedance. The results demonstrated that the rate determining step(rds) of the reaction varies with the temperature, oxygen partial pressure and overpotential applied. At open circuit potential, the rds is the dissociative adsorption of oxygen on the LSM surface. A large number of electron holes are generated at high anodic overpotentials, while oxygen vacancies are formed at high cathodic overpotentials. The formation of the electron holes results in the electronic conduction of the YSZ electrolyte and the extension of the electrochemical active area. While the formation of oxygen vacancies leads to the ionic conduction in the LSM electrode and the extension of the electrochemical active area over the LSM electrode surface. The extension of active area and the increase of the conductivity induce some special phenomena reflected in AC impedance spectra, such as the decrease of both the electrode resistance and the ohmic drop, the increase of the double layer capacitance, and the appearance of the low frequency inductive arc at low temperature. The rds of the reaction at low temperature and high overpotentials is the charge transfer step, while at high temperature the rds of the reaction at high anodic and cathodic overpotential are the charge transfer step and the diffusion of oxygen over LSM surface respectively.zh_CN
dc.language.isozhzh_CN
dc.publisher厦门大学《电化学》编辑部zh_CN
dc.relation.ispartofseries研究论文zh_CN
dc.relation.ispartofseriesArticleszh_CN
dc.source.urihttp://electrochem.xmu.edu.cn/CN/abstract/abstract9476.shtmlzh_CN
dc.subject锶掺杂的锰酸镧zh_CN
dc.subject氧电化学还原zh_CN
dc.subject交流阻抗zh_CN
dc.subjectStrontium doped lanthanum manganitezh_CN
dc.subjectElectrochemical reduction of oxygenzh_CN
dc.subjectAC impedancezh_CN
dc.titleLa_(0.8)Sr_(0.2)MnO_3/YSZ高温电极交流阻抗研究zh_CN
dc.title.alternativeAC Impedance Study of the La 0.8 Sr 0.2 MnO 3/YSZ Electrodezh_CN
dc.typeArticlezh_CN
dc.description.note作者联系地址:中国科学院大连化学物理研究所zh_CN
dc.description.noteAuthor's Address: Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023zh_CN


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record