Improvement in the durability of pt electrocatalysts by coverage with silica layers

被引：104

作者：

Takenaka, Sakae

Matsumori, Hiroshi

Nakagawa, Keizo

Matsune, Hideki

Tanabe, Eishi

Kishida, Masahiro

机构：

[1] Kyushu Univ, Grad Sch Engn, Dept Chem Engn, Nishi Ku, Fukuoka 8190395, Japan

[2] Western Hiroshima Prefecture Ind Inst, Hiroshima 7390046, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2007年 / 111卷 / 42期

关键词：

D O I：

10.1021/jp076120b

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：

Carbon nanotube (CNT)-supported Pt metal nanoparticles were covered with silica layers by utilizing the successive hydrolysis of 3-aminopropyl-triethoxysilane and tetraethoxysilane on CNTs with Pt hydroxide. The CNT-supported Pt metal particles covered with silica layers (denoted as SiO2/Pt/CNT) were used as the electrocatalysts. SiO2/Pt/CNT electrocatalysts showed a high stability for the repeated potential cycling experiment, whereas Pt/CNT electrocatalysts were deactivated seriously for the experiment because of the growth of Pt metal particles in size. The silica layers in SiO2/Pt/CNT prevent the dissolution of Pt metal particles as well as the migration and agglomeration of Pt metal particles on the supports, which results in the improvement of the stability of Pt/CNT electrocatalysts.

引用

页码：15133 / 15136

页数：4

共 23 条

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