Growth of Porous Platinum Catalyst Structures on Tungsten Oxide Support Materials: A New Design for Electrodes

被引：7

作者：

Hengge, Katharina A. ^{[1
]}

Heinzl, Christoph ^{[2
]}

Perchthaler, Markus ^{[2
]}

Geiger, Simon ^{[1
]}

Mayrhofer, Karl J. J. ^{[1
]}

Scheu, Christina ^{[1
,3
]}

机构：

[1] Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany

[2] Elcore GmbH, Bayerwaldstr 3, D-81737 Munich, Germany

[3] Rhein Westfal TH Aachen, Mat Analyt, Kopernikusstr 10, D-52074 Aachen, Germany

来源：

CRYSTAL GROWTH & DESIGN | 2017年 / 17卷 / 04期

关键词：

MEMBRANE FUEL-CELLS; 3-DIMENSIONAL RECONSTRUCTION; DISCRETE TOMOGRAPHY; DEGRADATION; SIRT; NANOPARTICLES; NANOMATERIALS; TRANSITION; CRYSTALS; SURFACES;

D O I：

10.1021/acs.cgd.6b01663

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The growth of a promising material system for high-temperature polymer-electrolyte-membrane-fuel, cells, namely, platinum-(Pt) loaded tungsten suboxide (WO3-x) electrodes, has been studied in-depth. The template-free twostep synthesis-results in highly porous three-dimensional networks of crystalline Pt nanorods on the WO3-x support. The formation, and growth behavior of these catalyst morphologies arc investigated as a function of the deposition time of the catalyst precursor by use of scanning electron microscopy and various transmission electron microscopy techniques. The analysis reveals that octahedral-shaped bulk crystals of the Pt-precursor are formed on the WO3-x support, which subsequently reduce during the thermal treatment. After a reduction time of 4 min, the core of the catalyst Morphologies is still bulk material, composed of Pt nanoparticles embedded in-a, reduced form of the Pt precursor, while the outer shell is formed by a porous network of polycrystalline Pt. Electron tomography helps to reveal the connectivity of the Pt network and allows calculation of the surface-area of a 100 nm X 100 nm portion. This is compared to the macroscopic value for the surface area of the samples' entire network obtained by cyclic voltammery.

引用

页码：1661 / 1668

页数：8

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