Elucidating the activity of stepped Pt single crystals for oxygen reduction

被引：96

作者：

Bandarenka, Aliaksandr S. ^{[1
]}

Hansen, Heine A. ^{[2
]}

Rossmeisl, Jan ^{[3
]}

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

机构：

[1] Ctr Electrochem Sci CES, D-44780 Bochum, Germany

[2] Tech Univ Denmark, Dept Energy Convers & Storage, DK-4000 Roskilde, Denmark

[3] Tech Univ Denmark, Dept Phys, Ctr Atom Scale Mat Design, DK-2800 Lyngby, Denmark

[4] Tech Univ Denmark, Dept Phys, Ctr Individual Nanoparticle Funct, DK-2800 Lyngby, Denmark

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2014年 / 16卷 / 27期

基金：

新加坡国家研究基金会;

关键词：

FUEL-CELL CATHODE; PLATINUM SURFACES; ACIDIC MEDIA; N(111)-(100) SERIES; METAL-SURFACES; ELECTROCATALYSIS; WATER; SIZE; NANOPARTICLES; ELECTRODES;

D O I：

10.1039/c4cp00260a

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 unexpectedly high measured activity of Pt[n(111) x (111)] and Pt[n(111) x (100)] stepped single crystal surfaces towards the oxygen reduction reaction (ORR) is explained utilizing the hydroxyl binding energy as the activity descriptor. Using this descriptor (estimated using experimental data obtained by different groups), a well-defined Sabatier-type volcano is observed for the activities measured for the Pt[n(111) x (111)] and Pt[n(111) x (100)] stepped single crystals, in remarkable agreement with earlier theoretical studies. We propose that the observed destabilisation of *OH species at these surfaces is due to the decreased solvation of the adsorbed hydroxyl intermediates on adjacent terrace sites.

引用

页码：13625 / 13629

页数：5

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