Excellent Durability of Carbon-Supported Pt Cathode Catalysts Covered with Silica Layers

被引：2
|
作者：
Matsumori, Hiroshi [1 ]
Takenaka, Sakae [1 ]
Matsune, Hideki [1 ]
Kishida, Masahiro [1 ]
机构：
[1] Kyushu Univ, Grad Sch Engn, Dept Chem Engn, Nishi Ku, Fukuoka 8190395, Japan
来源：
PROTON EXCHANGE MEMBRANE FUEL CELLS 9 | 2009年 / 25卷 / 01期
关键词：
OXYGEN-REDUCTION ELECTROCATALYSTS; NANOPARTICLES; NANOTUBES;
D O I：
10.1149/1.3210620
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Multi-walled carbon nanotube-supported platinum electrocatalysts (Pt/CNT) for cathode in polymer electrolyte fuel cells were covered with silica layers (SiO2/Pt/CNT) in order to improve the durability. SiO2/Pt/CNT had a high catalytic activity in spite of uniform coverage of Pt metal with silica which was an insulator. The catalytic activity of SiO2/Pt/CNT did not change appreciably during the durability test (repeated potential cycling between 0.05 and 1.20V vs. RHE), whereas Pt/CNT was seriously deactivated. Silica layer which enveloped Pt metal particles in SiO2/Pt/CNT prevented the agglomeration of Pt metal particles as well as the growth of Pt metal particles in size through dissolution and redeposition of Pt metal.
引用
收藏
页码：689 / 696
页数：8
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