Restructure nanoporous alloys get more efficient catalyst

Restructure nanoporous alloys to get a more efficient catalyst

11:06 AM, 13th January 2017
nanoporous gold alloys
At left is an aberration-corrected environmental-transmission electron microscopy image revealing the formation of highly crystalline metallic nanoparticles during activation of nanoporous gold. At right is a low-magnification TEM image showing the pore and ligament structure of nanoporous gold.

LIVERMORE, US: New research shows that the phases that nano-structured materials go through to become an efficient catalyst, as good as gold.

Lawrence Livermore National Laboratory (LLNL) material scientist Juergen Biener and collaborators found that by restructuring nanoporous gold alloys they become more efficient catalysts.

Nano-structured materials hold promise for improving catalyst activity and selectivity, but little is known about the dynamic compositional and structural changes that these systems undergo during pre-treatment, which leads to efficient catalyst function. (A catalyst is a substance that enables a chemical reaction to proceed at a usually faster rate or under different conditions than otherwise possible.)

The team used ozone-activated silver-gold alloys in the form of nanoporous gold (npAu) as a case study to demonstrate the dynamic behaviour of bimetallic systems during activation to produce a functioning catalyst.

The research appears in the journal Nature Materials.

Nanoporous gold, a porous metal, can be used in electrochemical sensors, catalytic platforms, fundamental structure-property studies at the nanoscale and tunable drug release. It also features high effective surface area, tunable pore size, well-defined conjugate chemistry, high electrical conductivity and compatibility with traditional fabrication techniques.

"Our results demonstrate that characterization of these dynamic changes is necessary to unlock the full potential of bimetallic catalytic materials," Biener said.

Advanced in-situ electron microscopy and X-ray photoelectron spectroscopy were used to demonstrate that major restructuring and compositional changes occur along the path to catalytic function.

This work was supported as part of the Integrated Mesoscale Architectures for Sustainable Catalysis, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Basic Energy Sciences.

© LLNL News

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