Zeolite-templated Pt/C electrocatalysts

被引：21

作者：

Coker, Eric N. ^{[1
]}

Steen, William A. ^{[1
]}

Miller, James E. ^{[1
]}

机构：

[1] Sandia Natl Labs, Albuquerque, NM 87185 USA

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2007年 / 104卷 / 1-3期

关键词：

Pt cluster; electrocatalyst; activation energy; porous carbon; thermal treatment;

D O I：

10.1016/j.micromeso.2007.02.044

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

In an effort to reduce the amount of platinum required in low temperature fuel cells, we have prepared electrocatalysts of platinum nanoparticles-on-carbon through zeolite-templating methods. Several different zeolite structure-types, as well as clays and mesoporous silicas were investigated as hosts for the preparation of small Pt clusters through thermal decomposition of ion exchanged (NH3)4Pt(2+). Several factors relating to cluster confinement and mobility influence cluster size, and clusters below 1 nm with narrow size distribution have been prepared. To enable electrochemical application, the pores of the Pt cluster-containing zeolite were filled with electrically conductive carbon via infiltration with carbon precursors, polymerization, and pyrolysis. The zeolite host was then removed by acid digestion, to leave a micro-/mesoporous Pt/C electrocatalyst possessing Pt clusters of controlled size. Preliminary electrochemical evaluation of these catalysts is reported. The energetics of thermal decomposition of (NH3)(4)Pt2+ to form Pt clusters in zeolite X have been investigated through Differential Scanning Calorimetry, and apparent activation energies calculated. The relationship between (NH3)4Pt2+ decomposition and conditions of calcination has been explored in an effort to better control Pt cluster sizes. (C) 2007 Elsevier Inc. All rights reserved.

引用

页码：236 / 247

页数：12

共 65 条

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