Issue 28, 2012
From the journal:

Journal of Materials Chemistry

Nanoporous Pd alloys with compositionally tunable hydrogen storage properties prepared by nanoparticle consolidation†

Patrick J. Cappillino,a   Joshua D. Sugar,a   Michelle A. Hekmaty,a   Benjamin W. Jacobs,b   Vitalie Stavila,a   Paul G. Kotula,c   Jeffrey M. Chames,a   Nancy Y. Yanga  and  David B. Robinson*a  

* Corresponding authors

a Sandia National Laboratories, PO Box 969, Mail Stop 9291, Livermore, CA, USA
E-mail: drobins@sandia.gov
Tel: +1 925-294-6613

b Protochips, Inc, 617 Hutton Street Suite 111, Raleigh, NC, USA
Tel: +1 919-341-2612

c Sandia National Laboratories, Department of Materials Characterization, Albuquerque, NM, USA
Tel: +1 505-844-8947

Abstract

Nanoporous palladium and palladium alloys are expected to have improved mass transport rates and cycle life compared to bulk materials for energy storage and other applications due to high ratios of surface area to metal volume. Preparation of such materials with high thermal stability and well-controlled metal composition, however, remains a challenge. This work describes a scalable, bottom-up technique for preparing nanoporous palladium alloys based on partial consolidation of dendrimer-encapsulated nanoparticles (DEN). Destabilization of a colloidal suspension of DEN and purification yields high surface area material (60–80 m2 g−1) with a broad pore size distribution centered between 20 and 50 nm. This approach allows for precise tuning of product composition through adjustment of the composition of the precursor DEN. Nanoporous Pd0.9Rh0.1 alloys with uniform composition or with Rh enrichment at pore walls and grain boundaries have been prepared and these structures have been confirmed with high-spatial resolution, aberration corrected quantitative STEM-EDS. Compared to bulk alloys of the same nominal composition, the nanoporous bimetallics show much faster hydrogen uptake kinetics, and store hydrogen at much lower pressure. Pore structure remains intact to temperatures above 300 °C, suggesting that these materials will have long lifetimes at the temperatures used for hydrogen storage applications.

Graphical abstract: Nanoporous Pd alloys with compositionally tunable hydrogen storage properties prepared by nanoparticle consolidation

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Article information

DOI
https://doi.org/10.1039/C2JM30988B
Article type
Paper
Submitted
17 Feb 2012
Accepted
10 Jun 2012
First published
11 Jun 2012

J. Mater. Chem., 2012,22, 14013-14022

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Nanoporous Pd alloys with compositionally tunable hydrogen storage properties prepared by nanoparticle consolidation

P. J. Cappillino, J. D. Sugar, M. A. Hekmaty, B. W. Jacobs, V. Stavila, P. G. Kotula, J. M. Chames, N. Y. Yang and D. B. Robinson, J. Mater. Chem., 2012, 22, 14013 DOI: 10.1039/C2JM30988B

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