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dc.contributor.author陈微zh_CN
dc.contributor.author廖玲文zh_CN
dc.contributor.author何政达zh_CN
dc.contributor.author陈艳霞zh_CN
dc.contributor.authorCHEN Weizh_CN
dc.contributor.authorLIAO Ling-wenzh_CN
dc.contributor.authorHE Zheng-dazh_CN
dc.contributor.authorCHEN Yan-xiazh_CN
dc.date.accessioned2014-10-23T02:51:28Z
dc.date.available2014-10-23T02:51:28Z
dc.date.issued2014-10-28zh_CN
dc.identifier.citation电化学,2014,20(5):444-451.zh_CN
dc.identifier.issn1006-3471zh_CN
dc.identifier.urihttp://dx.doi.org/10.13208/j.electrochem.131167zh_CN
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/80512
dc.description.abstract旋转圆盘电极(RDE)体系主要用于低溶解度反应物的电极过程动力学研究. 在利用RDE技术研究不可逆电极反应动力学时,人们常利用Koutecky-Levich方程排除传质的影响,从总电流估算反应的动力学电流. 由于K-L方程是建立在系统满足稳态扩散模型的基础上,实际运用时如果体系偏离稳态扩散,就有可能对估算的动力学参数造成很大误差. 本文以氧气在多晶铂电极上的还原反应为例系统地估算了不同氧气浓度与电极转速下的误差,结果表明低氧气浓度与低圆盘转速的情况不满足稳态扩散条件,若此时仍根据K-L方程利用外推法进行分析,误差可达30%. 因此作者建议,在RDE体系中利用K-L方程估算动力学参数时,最好忽略低浓度与低转速下的数据,直接使用较高浓度与较高转速下的数据进行计算与分析.zh_CN
dc.description.abstractRotating disk electrode system is mainly used to study the kinetics of reactions whose reactants have very low solubility in the electrolyte. For an irreversible reaction, Koutecky-Levich equation (K-L Eq.) is frequently used to deduce the kinetic current ik). Since K-L Eq. is derived based on the assumption that a system should conform the steady-state diffusion conditions, the data recoded from the actual system which deviates from such a condition, great error may be induced for the ik estimated. In this work, polarization curves for oxygen reduction reaction at polycrystalline Pt electrode recorded in solutions with various O2 concentrations and under various electrode rotation speeds have been analyzed systematically. Our analysis reveals that an error of 30% may be introduced by extrapolation to infinite rotation speed in solution with low O2 concentration or by including the data recorded under very slow electrode rotation speeds. The origins of the error and the ways to avoid such error are discussed.zh_CN
dc.description.sponsorship国家自然科学基金项目(No. 21073176)及科技部973计划项目(No. 2010CB923302)资助zh_CN
dc.language.isozhzh_CN
dc.publisher厦门大学《电化学》编辑部zh_CN
dc.relation.ispartofseries电化学近期研究专辑(厦门大学 姜艳霞教授主编)zh_CN
dc.relation.ispartofseriesSpecial Issue on Current Electrochemistry (Editor: Professor JIANG Yan-xia, Xiamen University)zh_CN
dc.source.urihttp://electrochem.xmu.edu.cn/CN/abstract/abstract10102.shtmlzh_CN
dc.subject气体电极反应zh_CN
dc.subject旋转圆盘电极方法zh_CN
dc.subjectK-L方程zh_CN
dc.subject扩散传质zh_CN
dc.subject氧还原反应zh_CN
dc.subjectgas electrode reactionzh_CN
dc.subjectrotating disk electrodezh_CN
dc.subjectKoutecky-Levich equationzh_CN
dc.subjectdiffusionzh_CN
dc.subjectmmass transportzh_CN
dc.subjectoxygen reduction reactionzh_CN
dc.title利用K-L方程估算旋转圆盘电极体系反应动力学电流的误差来源分析zh_CN
dc.title.alternativeOn the Origin of the Errors of ik as Estimated from K-L Equation in Rotating Disk Electrode Systemzh_CN
dc.typeArticlezh_CN
dc.description.note作者联系地址:中国科技大学 化学物理系,合肥微尺度物质科学国家实验室(筹),安徽 合肥 230026zh_CN
dc.description.noteAuthor's Address: Department of Chemical Physics, Hefei National Laboratory for Physical Sciences at Microscale; University of Science and Technology of China, Hefei 230026, Chinazh_CN
dc.description.note通讯作者E-mail:yachen@ustc.edu.cnzh_CN


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