Electrochemical promotion of CO combustion over Pt/YSZ under high vacuum conditions

被引：6

作者：

Xia, Chun ^{[1
,2
,3
,4
]}

Falgairette, Cyril ^{[2
]}

Li, Yongdan ^{[3
,4
]}

Foti, Gyoergy ^{[2
]}

Comninellis, Christos ^{[2
]}

Harbich, Wolfgang ^{[1
]}

机构：

[1] Ecole Polytech Fed Lausanne, Inst Condensed Matter Phys, CH-1015 Lausanne, Switzerland

[2] Ecole Polytech Fed Lausanne, Inst Chem Sci & Engn, CH-1015 Lausanne, Switzerland

[3] Tianjin Univ, Sch Chem Engn, Tianjin Key Lab Appl Catalysis Sci & Technol, Tianjin 300072, Peoples R China

[4] Tianjin Univ, Sch Chem Engn, State Key Lab Chem Engn, Tianjin 300072, Peoples R China

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2012年 / 113卷

基金：

瑞士国家科学基金会;

关键词：

Electrochemical promotion; Pt/YSZ; Oxygen storage; High vacuum; Persistent electrochemical promotion; CATALYTIC-ACTIVITY; CHARGE STORAGE; OXYGEN; INTERFACE; ZIRCONIA; FRONT;

D O I：

10.1016/j.apcatb.2011.11.044

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Electrochemical promotion of CO combustion over Pt/YSZ was investigated under high vacuum conditions. A galvanostatic step was coupled to mass spectrometric gas analysis using an electrochemical mass spectrometric monitoring device. Non-Faradaic electrochemical promotion of catalysis took place at 300 degrees C while only electrochemical oxidation was observed at 400 degrees C. Oxygen evolution measurements revealed that electrochemical promotion is related to the thermodynamically stable PtOx species over the Pt/gas interface. The polarization time and O-2 pressure show strong influence on the relaxation transient upon current interruption. We propose that during anodic polarization, PtOx is first formed at the Pt/YSZ interface. With prolonged polarization time, the formed PtOx either migrates over the Pt/gas interface inducing electrochemical promotion or diffuses into the Pt bulk leading to the oxygen storage. After polarization, the stored O species is released and acts as sacrificial promoter causing the persistent electrochemical promotion effect. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：250 / 254

页数：5

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