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

共 38 条

[11] Dependence of PEM fuel cell performance on catalyst loading [J].

Gasteiger, HA ;

Panels, JE ;

Yan, SG .

JOURNAL OF POWER SOURCES, 2004, 127 (1-2) :162-171

[12] A review of focused ion beam milling techniques for TEM specimen preparation [J].

Giannuzzi, LA ;

Stevie, FA .

MICRON, 1999, 30 (03) :197-204

[13]

GILBERT P, 1972, J THEOR BIOL, V36, P105, DOI 10.1016/0022-5193(72)90180-4

[14] Computational analysis and improvement of SIRT [J].

Gregor, Jens ;

Benson, Thomas .

IEEE TRANSACTIONS ON MEDICAL IMAGING, 2008, 27 (07) :918-924

[15] ON THE RELATIONS BETWEEN STRUCTURE AND MORPHOLOGY OF CRYSTALS .1. [J].

HARTMAN, P ;

PERDOK, WG .

ACTA CRYSTALLOGRAPHICA, 1955, 8 (01) :49-52

[16] Insight into the Degradation of HT-PEMFCs Containing Tungsten Oxide Catalyst Support Material for the Anode [J].

Heinzl, Christoph ;

Hengge, Katharina A. ;

Perchthaler, Markus ;

Hacker, Viktor ;

Scheu, Christina .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2015, 162 (03) :F280-F290

[17] Characterization and performances of cobalt-tungsten and molybdenum-tungsten carbides as anode catalyst for PEFC [J].

Izhar, Shamsul ;

Yoshida, Michiko ;

Nagai, Masatoshi .

ELECTROCHIMICA ACTA, 2009, 54 (04) :1255-1262

[18] Investigation into the Catalytic Activity of Porous Platinum Nanostructures [J].

Kalekar, Ajit M. ;

Sharma, Kiran Kumar K. ;

Lehoux, Anais ;

Audonnet, Fabrice ;

Remita, Hynd ;

Saha, Abhijit ;

Sharma, Geeta K. .

LANGMUIR, 2013, 29 (36) :11431-11439

[19] Oxygen Electrochemistry as a Cornerstone for Sustainable Energy Conversion [J].

Katsounaros, Ioannis ;

Cherevko, Serhiy ;

Zeradjanin, Aleksandar R. ;

Mayrhofer, Karl J. J. .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2014, 53 (01) :102-121

[20] METHODS OF LEAST-SQUARES AND SIRT IN RECONSTRUCTION [J].

LAKSHMINARAYANAN, AV ;

LENT, A .

JOURNAL OF THEORETICAL BIOLOGY, 1979, 76 (03) :267-295

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