Adsorbed Intermediates in Oxygen Reduction on Platinum Nanoparticles Observed by In Situ IR Spectroscopy

被引：200

作者：

Nayak, Simantini ^{[1
]}

McPherson, Ian J. ^{[1
]}

Vincent, Kylie A. ^{[1
]}

机构：

[1] Univ Oxford, Dept Chem, Inorgan Chem Lab, South Parks Rd, Oxford OX1 3QR, England

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2018年 / 57卷 / 39期

基金：

欧洲研究理事会; 欧盟地平线“2020”;

关键词：

electrochemistry; IR spectroscopy; oxygen reduction; platinum; reaction mechanisms; RING-DISK ELECTRODE; INFRARED-SPECTROSCOPY; ELECTROREDUCTION; SUPEROXIDE; OXIDATION; SURFACES; CATALYST; ELECTROCATALYSTS; IDENTIFICATION; N-GE(100);

D O I：

10.1002/anie.201804978

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The sluggish kinetics of oxygen reduction to water remains a significant limitation in the viability of proton-exchange-membrane fuel cells, yet details of the four-electron oxygen reduction reaction remain elusive. Herein, we apply in situ infrared spectroscopy to probe the surface chemistry of a commercial carbon-supported Pt nanoparticle catalyst during oxygen reduction. The IR spectra show potential-dependent appearance of adsorbed superoxide and hydroperoxide intermediates on Pt. This strongly supports an associative pathway for oxygen reduction. Analysis of the adsorbates alongside the catalytic current suggests that another pathway must also be in operation, consistent with a parallel dissociative pathway.

引用

页码：12855 / 12858

页数：4

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