Pt(111)单晶电极上乙二醇解离吸附反应动力学  

Kinetics of Dissociative Adsorption of Ethylene Glycol on Pt(111) Electrode

作　　者：樊友军[1] 范纯洁[1] 甄春花[1] 陈声培[1] 孙世刚[1] 

机构地区：[1]厦门大学固体表面物理化学国家重点实验室化学系,厦门361005

出　　处：《物理化学学报》2004年第4期382-385,共4页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20373059;90206039);教育部科学技术重点研究基金资助项目~~

摘　　要：运用电化学循环伏安和程序电位阶跃方法研究了乙二醇在Pt(111)单晶电板上的解离吸附过程,动力学研究的定量结果指出,乙二醇解离吸附反应的平均速率v随电极电位变化呈火山型分布,其最大值在0.10V(vsSCE)附近.测得在含2×10-3mol·L-1乙二醇的溶液中,最大初始解离速率V1为4.35×10-12mol·cm-2·S-1.The dissociative adsorption of ethylene glycol (EG) on Pt (111) electrode has been investigated with electrochemical cyclic voltammetry and programmed potential step technique. The quantitative results demonstrated that the average rate of dissociative adsorption of ethylene glycol on Pt(111) electrode depends on electrode potentials, yielding a distribution of volcanic shape on adsorption potentials between - 0. 20 and 0. 35 V with the maximum value of 3.90 x 10(-12) mol . cm (-2) . s (-1) located near 0. 10 V ( vs SCE). From the variation of the quanti-ty of dissociative adsorbates determined through the oxidation charge with adsorption time ( t(ad)), the initial rate ( nu(i)) of this surface reaction has been evaluated quantitatively. The maximum of nu(i) was ascertained to be 4.35 x 10 (-12) mol . cm (-2) - s (-1) at 0. 10 V for a solution containing 2 x 10 (-3) mol . L (-1) EG.

关 键 词：铂(111)单晶电极 乙二醇 解离吸附 反应动力学 电化学循环伏安法 程序电位阶跃法 

分 类 号：O646.54[理学—物理化学]