Rotating Disk Electrode (RDE) Investigation of BH4- and BH3OH- Electro-oxidation at Pt and An: Implications for BH4- Fuel Cells

被引：142

作者：

Finkelstein, David A. ^{[1
]}

Da Mota, Nicolas ^{[1
]}

Cohen, Jamie L. ^{[1
]}

Abruna, Hector D. ^{[1
]}

机构：

[1] Cornell Univ, Baker Lab, Dept Chem & Chem Biol, Ithaca, NY 14853 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2009年 / 113卷 / 45期

关键词：

DIRECT BOROHYDRIDE; SODIUM-BOROHYDRIDE; HYDROGEN GENERATION; ELECTROCHEMICAL OXIDATION; DIMETHYLAMINE BORANE; PLATINUM-ELECTRODES; PART I; GOLD; AU; HYDROLYSIS;

D O I：

10.1021/jp900933c

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：

We present a thorough electrochemical study of the mechanism of borohydride oxidation on gold and platinum surfaces via cyclic voltammetry and rotating disk and ring-disk electrode voltammetry. We have paid particularly close attention to the number of electrons transferred (from a theoretical maximum of 8e(-)), values of the heterogeneous charge transfer rate constant (k(b)), the presence of coupled chemical reactions, and adsorbed intermediates. We find that the nature of the electrode (Pt, Au) plays an important role in all of these processes and we present a detailed mechanistic analysis in light of the above-mentioned results. Our study suggests that Pt will significantly outperform Au for a direct borohydride fuel cell, providing similar electron recovery at much lower anode potentials.

引用

页码：19700 / 19712

页数：13

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