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

Abstract

Small platinum clusters have been prepared in zeolite hosts through ion exchange and controlled calcination/reduction processes. In order 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. Finally, electroactive surface areas as high as 112 m 2 g Pt -1 have been achieved in Pt/C electrocatalysts which show oxygen reduction performance comparable to standard industrial catalysts.

Authors:
 [1];  [1];  [2];  [3];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. BP Research Center, Naperville (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1426964
Report Number(s):
SAND-2007-1311J
Journal ID: ISSN 0959-9428; JMACEP; 526748
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Materials Chemistry
Additional Journal Information:
Journal Volume: 17; Journal Issue: 31; Journal ID: ISSN 0959-9428
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE

Citation Formats

Coker, Eric N., Steen, William A., Miller, Jeffrey T., Kropf, A. Jeremy, and Miller, James E.. The preparation and characterization of novel Pt/C electrocatalysts with controlled porosity and cluster size. United States: N. p., 2007. Web. doi:10.1039/b703916f.
Coker, Eric N., Steen, William A., Miller, Jeffrey T., Kropf, A. Jeremy, & Miller, James E.. The preparation and characterization of novel Pt/C electrocatalysts with controlled porosity and cluster size. United States. doi:10.1039/b703916f.
Coker, Eric N., Steen, William A., Miller, Jeffrey T., Kropf, A. Jeremy, and Miller, James E.. Wed . "The preparation and characterization of novel Pt/C electrocatalysts with controlled porosity and cluster size". United States. doi:10.1039/b703916f. https://www.osti.gov/servlets/purl/1426964.
@article{osti_1426964,
title = {The preparation and characterization of novel Pt/C electrocatalysts with controlled porosity and cluster size},
author = {Coker, Eric N. and Steen, William A. and Miller, Jeffrey T. and Kropf, A. Jeremy and Miller, James E.},
abstractNote = {Small platinum clusters have been prepared in zeolite hosts through ion exchange and controlled calcination/reduction processes. In order 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. Finally, 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.},
doi = {10.1039/b703916f},
journal = {Journal of Materials Chemistry},
number = 31,
volume = 17,
place = {United States},
year = {Wed May 23 00:00:00 EDT 2007},
month = {Wed May 23 00:00:00 EDT 2007}
}

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Cited by: 14 works
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