Influence of the alkali metal cations on the activity of Pt(111) towards model electrocatalytic reactions in acidic sulfuric media

被引：34
|
作者：
Tymoczko, Jakub [1 ,2 ]
Colic, Viktor [1 ]
Ganassin, Alberto [1 ,2 ]
Schuhmann, Wolfgang [1 ,2 ]
Bandarenka, Aliaksandr S. [1 ,3 ]
机构：
[1] Ruhr Univ Bochum, CES, D-44780 Bochum, Germany
[2] Ruhr Univ Bochum, Analyt Chem Elektroanalyt & Sensorik, D-44780 Bochum, Germany
[3] Tech Univ Munich, Phys Dept ECS, D-85748 Garching, Germany
来源：
CATALYSIS TODAY | 2015年 / 244卷
关键词：
Electrocatalysis; Electrochemical interface; Oxygen reduction; Oxygen evolution; Hydrogen evolution; Alkali metal ions; OXYGEN REDUCTION; NONCOVALENT INTERACTIONS; HYDROGEN EVOLUTION; OXIDE SURFACES; CELL; CATALYSTS; PLATINUM; ELECTRODES; DESIGN; DESCRIPTORS;
D O I：
10.1016/j.cattod.2014.07.007
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The impact of the alkali metal cations (Li+, Na+, K+, Rb+, Cs+) on the catalytic activity of Pt(1 1 1) electrodes towards model reactions (oxygen reduction, oxygen evolution, hydrogen evolution and hydrogen oxidation) in sulfuric acid has been evaluated. In contrast to essentially monotonic activity trends (i.e. from Li+ to Cs+) reported in the literature for alkaline media, the nature of the cations influences the activity of the Pt electrodes largely non-monotonously in the presence of SO42- ions. This is in certain cases due to the specifically adsorbing (bi) sulfate anions which make interactions between electrolyte components and reaction intermediates very complex. Surprisingly, the activity of the Pt(1 1 1) electrodes towards all investigated electrocatalytic reactions was substantially higher in Rb+ ions containing electrolytes (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：96 / 102
页数：7
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