TY - JOUR
T1 - Effects of heat treatment atmosphere on the structure and activity of Pt3Sn nanoparticle electrocatalysts
T2 - a characterisation case study
AU - Huang, Haoliang
AU - Nassr, Abu Bakr Ahmed Amine
AU - Celorrio, Verónica
AU - Taylor, S F Rebecca
AU - Puthiyapura, Vinod Kumar
AU - Hardacre, Christopher
AU - Brett, Dan J L
AU - Russell, Andrea E
PY - 2018/9/3
Y1 - 2018/9/3
N2 - Comprehensive identification of the phases and atomic configurations of bimetallic nanoparticle catalysts are critical in understanding structure-property 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.
AB - Comprehensive identification of the phases and atomic configurations of bimetallic nanoparticle catalysts are critical in understanding structure-property 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.
U2 - 10.1039/c7fd00221a
DO - 10.1039/c7fd00221a
M3 - Article (Academic Journal)
C2 - 29851419
SN - 1359-6640
VL - 208
SP - 555
EP - 573
JO - Faraday Discussions
JF - Faraday Discussions
IS - 0
ER -