Oxygen reduction on stepped platinum surfaces in acidic media
Oxygen reduction on stepped platinum surfaces in acidic media
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DOI：
10.1016/j.jelechem.2006.05.006
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发表时间：
2007-01-15
影响因子：
4.5
通讯作者：
Feliu, Juan M.
中科院分区：
文献类型：
--
作者：
Kuzume, Akiyoshi;Herrero, Enrique;Feliu, Juan M.
在酸性介质中，采用悬式弯月面旋转圆盘电极结构研究了Pt单晶表面的氧还原，以了解电极晶体取向对电子转移反应的影响。所使用的表面属于[110]区，可分为两个不同的系列，即具有由单原子（110）台阶分离的（111）阶地的表面和具有（110）阶地和（111）台阶的表面。在硫酸和高氯酸溶液中，Pt（111）表面的催化活性最低。相反，与先前在属于[011]区的Pt表面上报道的结果一致[M.D.马西亚Campitia、E. Herrero，J.M. Feliu，J. Electroanal. 564（2004）141]，阶梯状表面，与它们的阶梯位置对称性无关，显示出比基底低指数表面上的那些更高的氧还原催化活性。结构上的敏感性对电催化活性的影响进行了讨论的吸附物种的作用，如氢，氧，OH，电解质阴离子和氧化物的形成。(c)2006 Elsevier B.V.保留所有权利。
Oxygen reduction on Pt single crystal surfaces has been studied in acidic media using a hanging meniscus rotating disk electrode configuration to understand the effect of crystal orientation of the electrode toward electron transfer reactions. The surfaces used belong to the [110] zone that can be classified in two different series, i.e. surfaces with (111) terraces separated by monatomic (110) steps and surfaces with (110) terraces and (111) steps. Both in sulphuric and perchloric acid solutions, the Pt(111) surface showed the lowest catalytic activity among those studied. Conversely, in agreement with the results reported previously on Pt surfaces belonging to the [011] zone [M.D. Macia, J.M. Campitia, E. Herrero, J.M. Feliu, J. Electroanal. Chem. 564 (2004) 141], stepped surfaces, irrespectively to their step site symmetry, show higher catalytic activity on oxygen reduction than those on basal low-index surfaces. The effect on the structure sensitivity on the electrocatalytic activity is discussed in relation to the role of adsorbed species, such as hydrogen, oxygen, OH, electrolyte anions and oxide formation. (c) 2006 Elsevier B.V. All rights reserved.