A Methanol-Tolerant Carbon-Supported Pt-Au Alloy Cathode Catalyst for Direct Methanol Fuel Cells and Its Evaluation by DFT

被引：136

作者：

Selvarani, G. ^{[1
]}

Selvaganesh, S. Vinod ^{[1
]}

Krishnamurthy, S. ^{[1
]}

Kiruthika, G. V. M. ^{[1
]}

Sridhar, P. ^{[1
]}

Pitchumani, S. ^{[1
]}

Shukla, A. K. ^{[1
,2
]}

机构：

[1] Cent Electrochem Res Inst, Karaikkudi 630006, Tamil Nadu, India

[2] Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka, India

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2009年 / 113卷 / 17期

关键词：

OXYGEN REDUCTION REACTION; DENSITY-FUNCTIONAL THEORY; AUGMENTED-WAVE METHOD; GOLD NANOPARTICLES; ULTRASOFT PSEUDOPOTENTIALS; ELECTROCATALYTIC REDUCTION; NI ALLOYS; ELECTRODES; POLYMER; DMFCS;

D O I：

10.1021/jp810970d

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：

A Pt-Au alloy catalyst of varying compositions is prepared by codeposition of Pt and An nanoparticles onto a carbon support to evaluate its electrocatalytic activity toward an oxygen reduction reaction (ORR) with methanol tolerance in direct methanol fuel cells. The optimum atomic weight ratio of Pt to Au in the carbon-supported Pt-Au alloy (Pt-Au/C) as established by cell polarization, linear-sweep voltammetry (LSV), and cyclic voltammetry (CV) studies is determined to be 2: 1. A direct methanol fuel cell (DMFC) comprising a carbon-supported Pt-Au (2: 1) alloy as the cathode catalyst delivers a peak power density of 120 mW/cm(2) at 70 degrees C in contrast to the peak power density value of 80 mW/cm(2) delivered by the DMFC with carbon-supported Pt catalyst operating under identical conditions. Density functional theory (DFT) calculations on a small model cluster reflect electron transfer from Pt to Au within the alloy to be responsible for the synergistic promotion of the oxygen-reduction reaction on a Pt-Au electrode.

引用

页码：7461 / 7468

页数：8

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