Tuning Pt-Ir Interactions for NH3 Electrocatalysis

被引：51

作者：

Sacre, Nicolas ^{[1
]}

Duca, Matteo ^{[1
]}

Garbarino, Sebastien ^{[1
]}

Imbeault, Regis ^{[1
]}

Wang, Andrew ^{[1
]}

Youssef, Azza Hadj ^{[1
]}

Galipaud, Jules ^{[1
]}

Hufnagel, Gregor ^{[1
]}

Ruediger, Andreas ^{[1
]}

Roue, Lionel ^{[1
]}

Guay, Daniel ^{[1
]}

机构：

[1] Inst Natl Rech Sci Energie Mat & Telecommun, Varennes, PQ J3X 1S2, Canada

来源：

ACS CATALYSIS | 2018年 / 8卷 / 03期

基金：

加拿大自然科学与工程研究理事会;

关键词：

oriented thin films; bimetallic catalyst; pulsed laser deposition; platinum; iridium; ammonia oxidation; electrocatalysis; PULSED-LASER DEPOSITION; PREFERENTIAL; 100; ORIENTATION; SINGLE-CRYSTAL ELECTRODES; OXYGEN REDUCTION ACTIVITY; CORE-LEVEL SHIFTS; THIN-FILMS; AMMONIA OXIDATION; ELECTROCHEMICAL OXIDATION; BINARY-ALLOYS; ALKALINE MEDIA;

D O I：

10.1021/acscatal.7b02942

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：

PtxIr100-x thin films (8 nm thick) were deposited on MgO(100) substrates by pulsed laser deposition at 600 degrees C. As shown by X-ray diffraction and X-ray photoelectron spectroscopy analyses, the formation of fcc bulk and surface Pt-Ir solid solution was observed over the whole compositional range despite the large miscibility gap exhibited by these elements below ca. 1000 degrees C. Moreover, pole figures indicate that all films exhibit a Pt(001)[010]//[010](001)MgO cube-on-cube epitaxial relationship, which is consistent with AFM images. Cyclic voltammetry measurements performed in alkaline solutions confirmed both the presence of Ir atoms at the surface and the (100) surface orientation of all PtxIr100-x surfaces. The highest electrocatalytic activity for the electrooxidation of NH3 was observed for the Pt74Ir26(100) surface with a current density of ca. 1.0 mA cm(-2) at 0.71 V vs RHE, which is 25% higher than that on Pt(100). The reasons underlying this behavior are discussed.

引用

页码：2508 / 2518

页数：21

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