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Effects of heat treatment atmosphere on the structure and activity of Pt 3 Sn nanoparticle electrocatalysts: a characterisation case study

DOI: 10.1039/C7FD00221A DOI Help

Authors: Haoliang Huang (University of Southampton) , Abu Bakr Ahmed Amine Nassr (University of Southampton; Advanced Technology and New Materials Research Institute) , Veronica Celorrio (University of Bristol; UK Catalysis Hub; University College London (UCL)) , S. F. Rebecca Taylor (The University of Manchester) , Vinod Kumar Puthiyapura (The University of Manchester; Queen's University Belfast) , Christopher Hardacre (The University of Manchester; Queen's University Belfast) , Dan J. L. Brett (University College London (UCL)) , Andrea E. Russell (University of Southampton)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Faraday Discussions

State: Published (Approved)
Published: April 2018
Diamond Proposal Number(s): 10306

Open Access Open Access

Abstract: Comprehensive identification of the phases and atomic configurations of bimetallic nanoparticle catalysts are critical in understanding structure-properties relationships in catalysis. However, control of the structure, whilst retaining the same composition, is challenging. Here, the same carbon supported Pt3Sn catalyst is annealed under air, Ar and H2 resulting in variation of the extent of alloying of the two components. The atmosphere-induced extent of alloying is characterised using a variety of methods including TEM, XRD, XPS, XANES, and EXAFS and is defined as the fraction of Sn present as Sn0 (XPS and XANES) or the ratio of the calculated composition of the bimetallic particle to the nominal composition according to the stoichiometric ratio of the preparation (TEM, XRD, and EXAFS) . The values obtained depend on the structural method used, but the trend air < Ar < H2 annealed samples is consistent. These results are then used to provide insights regarding the electrocatalytic activity of Pt3Sn catalysts for CO, methanol, ethanol, and 1-butanol oxidation and the roles of alloyed Sn and SnO2.

Subject Areas: Materials, Chemistry


Instruments: B18-Core EXAFS

Documents:
C7FD00221A.pdf