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Energy dispersive-EXAFS of Pd nucleation at a liquid/liquid interface

DOI: 10.1088/1742-6596/712/1/012058 DOI Help

Authors: Sin-yuen Chang (University of Manchester) , Samuel Booth (University of Manchester) , Akihiro Uehara-kasuno (University of Manchester) , Fred Mosselmans (Diamond Light Source) , Giannantonio Cibin (Diamond Light Source) , V-t Pham (Synchrotron SOLEIL, Vietnam Academy of Science and Technology) , L Nataf (Synchrotron SOLEIL) , Robert Dryfe (University of Manchester) , Sven Schroeder (The University of Manchester, Diamond Light Source, University of Leeds)
Co-authored by industrial partner: No

Type: Conference Paper
Conference: XAFS 16
Peer Reviewed: Yes

State: Published (Approved)
Published: May 2016

Open Access Open Access

Abstract: Energy dispersive extended X-ray absorption fine structure (EDE) has been applied to Pd nanoparticle nucleation at a liquid/liquid interface under control over the interfacial potential and thereby the driving force for nucleation. Preliminary analysis focusing on Pd K edge-step height determination shows that under supersaturated conditions the concentration of Pd near the interface fluctuate over a period of several hours, likely due to the continuous formation and dissolution of sub-critical nuclei. Open circuit potential measurements conducted ex-situ in a liquid/liquid electrochemical cell support this view, showing that the fluctuations in Pd concentration are also visible as variations in potential across the liquid/liquid interface. By decreasing the interfacial potential through inclusion of a common ion (tetraethylammonium, TEA+) the Pd nanoparticle growth rate could be slowed down, resulting in a smooth nucleation process. Eventually, when the TEA+ ions reached an equilibrium potential, Pd nucleation and particle growth were inhibited.

Journal Keywords: palladium nucleation liquid-liquid interface EDEXAFS

Subject Areas: Chemistry, Materials

Technical Areas: