Jump to main content
Jump to site search

Issue 31, 2007
Previous Article Next Article

The preparation and characterization of novel Pt/C electrocatalysts with controlled porosity and cluster size

Author affiliations

Abstract

Small platinum clusters have been prepared in zeolite hosts through ion exchange and controlled calcination/reduction processes. To enable electrochemical application, the pores of the Pt-zeolite were filled with electrically conductive carbon via infiltration with carbon precursors, polymerization, and pyrolysis. The zeolite host was then removed by acid washing, to leave a Pt/C electrocatalyst possessing quasi-zeolitic porosity and Pt clusters of well-controlled size. The electrocatalysts were characterized by TEM, XRD, EXAFS, nitrogen adsorption and electrochemical techniques. Depending on the synthesis conditions, average Pt cluster sizes in the Pt/C catalysts ranged from 1.3 to 2.0 nm. The presence of ordered porosity/structure in the catalysts was evident in TEM images as lattice fringes, and in XRD as a low-angle diffraction peak with d-spacing similar to the parent zeolite. The catalysts possess micro- and meso-porosity, with pore size distributions that depend upon synthesis variables. Electroactive surface areas as high as 112 m2 gPt−1 have been achieved in Pt/C electrocatalysts which show oxygen reduction performance comparable to standard industrial catalysts.

Graphical abstract: The preparation and characterization of novel Pt/C electrocatalysts with controlled porosity and cluster size

Back to tab navigation

Supplementary files

Article information


Submitted
15 Mar 2007
Accepted
10 May 2007
First published
23 May 2007

J. Mater. Chem., 2007,17, 3330-3340
Article type
Paper

The preparation and characterization of novel Pt/C electrocatalysts with controlled porosity and cluster size

E. N. Coker, W. A. Steen, J. T. Miller, A. J. Kropf and J. E. Miller, J. Mater. Chem., 2007, 17, 3330
DOI: 10.1039/B703916F

Search articles by author

Spotlight

Advertisements