The inhibition of hydrogen peroxide reduction at low potentials on Pt(111): Hydrogen adsorption or interfacial charge?

被引：31
作者：
Briega-Martos, Valentin [1 ]
Herrero, Enrique [1 ]
Feliu, Juan M. [1 ]
机构：
[1] Univ Alicante, Inst Electroquim, Apdo 99, E-03080 Alicante, Spain
来源：
ELECTROCHEMISTRY COMMUNICATIONS | 2017年 / 85卷
关键词：
Oxygen reduction reaction; Hydrogen peroxide reduction; Pt(111); Platinum single crystal; Hydrogen adsorption; Interfacial charge; Potential zero free charge; SINGLE-CRYSTAL SURFACES; PLATINUM STEPPED SURFACES; OXYGEN REDUCTION; ELECTRODE; KINETICS; H2O2; PH; ELECTROCATALYSIS; MECHANISM; MAXIMUM;
D O I：
10.1016/j.elecom.2017.10.016
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The hydrogen peroxide reduction reaction (HPRR) on Pt(111) has been studied for the first time in acid to neutral pH values in the absence of anion specific adsorption using the HMRDE configuration. The onset for the reduction is ca. 0.95 V (RHE) for the Pt(111), irrespective of the pH value. At more negative potential values, the reduction is inhibited. It has been found that the diminution of the activity on Pt(111) occurs at the same potential value in the SHE scale for the different pH values. This indicates that this deactivation is not dependent on the hydrogen adsorption process, as has been previously suggested. However, it appears to be related to the interface water reorganization and the potential of zero free charge of the metal surface. In addition, studies in alkaline conditions suggest that the presence of adsorbed OH species promotes the total conversion of hydrogen peroxide to water.
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页码：32 / 35
页数：4
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