Investigation of Pt/WC/C catalyst for methanol electro-oxidation and oxygen electro-reduction

被引：53

作者：

Jeon, Min Ku ^{[1
]}

Lee, Ki Rak ^{[1
]}

Lee, Won Su ^{[1
]}

Daimon, Hideo ^{[2
]}

Nakahara, Akemi ^{[2
]}

Woo, Seong Ihl ^{[1
]}

机构：

[1] Korea Adv Inst Sci & Technol, Dept Chem & Biomol Engn, Grad Program BK21, Taejon 305701, South Korea

[2] Hitachi Maxell Ltd, Dev & Technol Div, Yawara, Ibaraki 3002496, Japan

来源：

JOURNAL OF POWER SOURCES | 2008年 / 185卷 / 02期

关键词：

Direct methanol fuel cell; Electrocatalyst; Carbon monoxide stripping; Methanol electro-oxidation; Oxygen electro-reduction;

D O I：

10.1016/j.jpowsour.2008.07.067

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/WC/C catalyst is developed to increase the methanol electro-oxidation (MOR) and oxygen electro-reduction (ORR) activities of the Pt/C catalyst. Cyclic voltammetry and CO stripping results show that spill-over of H+ occurs in Pt/WC/C, and this is confirmed by comparing the desorption area values for H+ and CO. A significant reduction in the potential of the CO electro-oxidation peak from 0.81 V for Pt/C to 0.68 V for Pt/WC/C is observed in CO stripping test results. This indicates that an increase in the activity for CO electro-oxidation is achieved by replacing the carbon Support with WC. Preferential deposition of Pt on WC rather than on the carbon support is investigated by complementary analysis of CO stripping, transmission electron microscopy and concentration mapping by energy dispersive spectroscopy. The Pt/WC/C catalyst exhibits a specific activity of 170 mA m(-2) for MOR. This is 42% higher than that for the Pt/C catalyst, viz., 120 mA m-2. The Pt/WC/C catalyst also exhibits a much higher current density for ORR, i.e., 0.87 mA cm(-2) compared with 0.36 mA cm(-1) for Pt/C at 0.7V. In the presence of methanol, the Pt/WC/C catalyst still maintains a higher current density than the Pt/C catalyst. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：927 / 931

页数：5

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