Electro-oxidation of dimethyl ether on Pt/C and PtMe/C catalysts in sulfuric acid

被引：52

作者：

Liu, Yan ^{[1
]}

Mitsushima, Shigenori ^{[1
]}

Ota, Ken-ichiro ^{[1
]}

Kamiya, Nobuyuki ^{[1
]}

机构：

[1] Yokohama Natl Univ, Chem Energy Lab, Hodogaya Ku, Yokohama, Kanagawa 2408501, Japan

来源：

ELECTROCHIMICA ACTA | 2006年 / 51卷 / 28期

关键词：

dimethyl ether; methanol; electro-oxidation; PtMe/C; Pt/C catalysts; a direct DME fuel cell;

D O I：

10.1016/j.electacta.2006.04.037

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The electro-oxidation of dimethyl ether (DME) on PtMe/Cs (Me = Ru, Sn, Mo, Cr, Ni, Co, and W) and Pt/C electro-catalysts were investigated in an aqueous half-cell, and compared to the methanol oxidation. The addition of a second metal enhanced the tolerance of Pt to the poisonous species during the DME oxidation reaction (DOR). The PtRu/C electro-catalyst showed the best electro-catalytic activity and the highest tolerance to the poisonous species in the low over-potential range (< 0.55V, 50 degrees C) among the binary electro-catalysts and the Pt/C, but at the higher potential (> ca. 0.55 V, 50 degrees C), the Pt/C behaved better than PtRu/C. The apparent activation energy for the DOR decreased in the order: PtRu/c (57 kJ Mol(-1)) > Pt3Sn/C (48 kJ mol(-1)) approximate to Pt/C (46 kJ mol(-1)). On the other hand, the activation energy for the MOR showed a different turn, decreased in the following order: Pt/C (43 kJ mol(-1)) > Pt3Sn/C (35 kJ mol(-1)) > PtRu/C (34 kJ mol(-1)). The temperature dependence of the DOR was greater than that of the oxidation of methanol (MOR) on the PtRu/C. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：6503 / 6509

页数：7

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