Importance of Surface IrOx in Stabilizing RuO2 for Oxygen Evolution

被引：102

作者：

Escudero-Escribano, Maria ^{[1
,2
,3
]}

Pedersen, Anders F. ^{[2
]}

Paoli, Elisa A. ^{[2
]}

Frydendal, Rasmus ^{[2
]}

Friebel, Daniel ^{[3
]}

Malacrida, Paolo ^{[2
]}

Rossmeisl, Jan

Stephens, Ifan E. L. ^{[1
,2
,4
]}

Chorkendorff, Ib ^{[1
,2
]}

机构：

[1] Univ Copenhagen, Dept Chem, Nanosci Ctr, Univ Pk 5, DK-2100 Copenhagen, Denmark

[2] Tech Univ Denmark DTU, Dept Phys, Fys Vej, Bldg 312, DK-2800 Lyngby, Denmark

[3] Stanford Univ, Dept Chem Engn, SUNCAT Ctr Interface Sci & Catalysis, 443 Via Ortega, Stanford, CA 94305 USA

[4] Imperial Coll London, Dept Mat, Royal Sch Mines, 2-03b, London SW7 2AZ, England

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2018年 / 122卷 / 02期

关键词：

EXCHANGE MEMBRANE ELECTROLYZERS; ELECTROCHEMICAL HYDROGEN OXIDATION; ACIDIC ENVIRONMENTS; ENERGY-CONVERSION; OXIDE CATALYSTS; WATER OXIDATION; MIXED OXIDES; IN-SITU; ELECTROCATALYSTS; EFFICIENT;

D O I：

10.1021/acs.jpcb.7b07047

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：

The high precious metal loading and high overpotential of the oxygen evolution reaction (OER) prevents the widespread utilization of polymer electrolyte membrane (PEM) water electrolyzers. Herein we explore the OER activity and stability in acidic electrolyte of a combined IrOx/RuO2 system consisting of RuO2 thin films with submonolayer (1, 2, and 4 angstrom) amounts of IrOx deposited on top. Operando extended X-ray absorption fine structure (EXAFS) on the Ir L-3 edge revealed a rutile type IrO2 structure with some Ir sites occupied by Ru, IrOx being at the surface of the RuO2 thin film. We monitor corrosion on IrOx/RuO2 thin films by combining electrochemical quartz crystal microbalance (EQCM) with inductively coupled mass spectrometry (ICP-MS). We elucidate the importance of submonolayer surface IrOx in minimizing Ru dissolution. Our work shows that we can tune the surface properties of active OER catalysts, such as RuO2, aiming to achieve higher electrocatalytic stability in PEM electrolyzers.

引用

页码：947 / 955

页数：9