Ex-situ exafs investigation of zeolite supported pt electrocatalyst structure

Yao, Jun and Yao, Yufeng (2017) Ex-situ exafs investigation of zeolite supported pt electrocatalyst structure. In: The Seventh International Symposium on Physics of Fluids (ISPF7), 12-15 June, 2017, Guiyang, China.

Ex-situ exafs investigation of zeolite supported pt electrocatalyst structur
Abstract_Dr Jun Yao_Lincoln_UK_ISFP 1.pdf

Item Type:Conference or Workshop contribution (Paper)
Item Status:Live Archive


he electrochemical performance of zeolite supported 1.5 wt% Pt electrocatalyst in fuel cell has been discussed in previous studies [1, 2]. This work will focus on investigating the influence of Pt loading and Pt deposition methods on Pt electrochemical performance and Pt particle size under different thermal treatment conditions. Both the 1.5 wt% and 5 wt% Pt loading on zeolite electrocatalyst were made in-house by Pt(NH3)4(NO3)2 salt or Pt(NH3)4(NO3)2/NH4NO3 salt with ion exchanged method and calcined at 350oC and then reduced at 400oC or direct reduced at 400oC, respectively. The cycle voltammetry measurement depicts a slightly high current change in hydride region for electrocatalyst under direct reduction at 400oC, with a shifted peak current towards positive potential region. This indicates that the energy level for hydrogen adsorption and desorption on Pt surface is higher in comparison to those electrocatalysts made by calcinations and reduction at 400oC. The extended X-ray adsorption fine spectroscopy measurement has revealed that the Pt nanoparticle size for electrocatalyst made by Pt(NH3)4(NO3)2/NH4NO3 or Pt(NH3)4(NO3)2 calcined and reduced at 400oC is smaller compared to those made by direct reduced at 400oC. The Pt nanoparticle size for 1.5 wt% Pt loading on zeolite is generally smaller than that for 5 wt% Pt loading electrocatalysts. The hydrogen spillover and surface conductance might be adopted to explain electrochemical performance presented by the Pt zeolite electrocatalyst.

Keywords:Pd nanoparticle, fuel cell, hydrogen spillover, electrochemical performance, ion exchange
Subjects:F Physical Sciences > F200 Materials Science
J Technologies > J510 Materials Technology
F Physical Sciences > F170 Physical Chemistry
Divisions:College of Science > School of Engineering
ID Code:33304
Deposited On:20 Oct 2018 19:46

Repository Staff Only: item control page