Investigation of the Pt/YSZ interface at low oxygen partial pressure by solid electrochemical mass spectroscopy under high vacuum conditions

被引：10

作者：

Falgairette, Cyril ^{[1
]}

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

Li, YongDan ^{[3
,4
]}

Harbich, Wolfgang ^{[2
]}

Foti, Gyoergy ^{[1
]}

Comninellis, Christos ^{[1
]}

机构：

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

[2] Ecole Polytech Fed Lausanne, Inst Condensed Matter Phys, 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：

JOURNAL OF APPLIED ELECTROCHEMISTRY | 2010年 / 40卷 / 10期

关键词：

Solid electrochemical mass spectrometry; SEMS; High vacuum; Pt/YSZ; Pt electrodes; Zirconia oxidation/reduction; Platinum oxidation/reduction; Oxygen storage; CHARGE STORAGE; ZIRCONIA; FRONT;

D O I：

10.1007/s10800-010-0160-4

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The Pt/YSZ interface was investigated at low oxygen partial pressure under high vacuum (HV) conditions at 400 A degrees C. Two different electrochemical techniques were coupled to mass spectrometric gas analysis using a new solid electrochemical mass spectrometric monitoring device. Under cathodic polarization, the lack of oxygen in the gas phase induces the reduction of the YSZ solid electrolyte which acts as oxygen source for the formation of O(2-) ions migrating to the anode. Under anodic polarization, both platinum oxidation and oxygen evolution reaction are identified. PtO (x) is formed at both the Pt/YSZ and the Pt/gas interface according to two different mechanisms. At the Pt/YSZ interface, PtO (x) formation is an electrochemical process following a parabolic growth law, while the presence of PtO (x) at the Pt/gas interface is related to the diffusion of PtO (x) formed at the triple phase boundary towards the Pt/gas interface. It is proposed that the side oxygen evolution reaction stabilizes thermodynamically the PtO (x) diffusion toward the gas exposed interface during the anodic polarization.

引用

页码：1901 / 1907

页数：7

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