Abstract
Experimental investigation was carried out for Pt electrochemical performance and Pt particle size using 1.5 and 5 wt% Pt loading on zeolite electrocatalysts made by Pt(NH3)4(NO3)2 or Pt(NH3)4(NO3)2/NH4NO3 salt with ion exchanged method and calcined at 350 °C and reduced at 400 °C or direct reduced at 400 °C, respectively. Cyclic voltammetry measurement indicated that the hydrogen energy binding level on Pt surfaces is higher for electrocatalyst under direct reduction process than those made by calcination and reduction process. The extended X-ray adsorption fine structure measurement revealed that Pt size for electrocatalyst made by calcination and reduction method is smaller than those made by direct reduced method. Furthermore, Pt size for electrocatalysts with 1.5 wt% Pt loading on zeolite is smaller compared to those with 5 wt% Pt loading electrocatalysts. Aforementioned electrochemical performance of Pt zeolite electrocatalysts as depicted by a hypothesis of hydrogen spillover and surface conductance pathway.
Highlights
Zeolite is increasingly employed for fuel cell application due to its chemical and physical characteristics which can offer a crystallized structure with great capacity for containing water
Two carbon oxide (CO) stripping peaks were captured in a potential region of 0 V and 0.17 V for electrode 15PtXC-72R, corresponding to a single cycle voltammetry (CV) stripping peak measured at 0.045 V for electrode 5PtXC-72R
The formation of Pt oxide might be involved in CO stripping reaction, as the oxidation of CO happens at a potential where the formation of Pt oxide occurs [16]
Summary
Zeolite is increasingly employed for fuel cell application due to its chemical and physical characteristics which can offer a crystallized structure with great capacity for containing water It can be completely hydrated and dehydrated without damage to the crystalline lattice [1]. Rolison et al [5, 11] have applied an approach using microelectrode by dispersing the modified zeolite powder in an electrolyte solution of high ionic strength placed between two large feeder electrodes The complication of their methods may induce the Pt nanoparticle exchange coming out of the zeolite structure into the electrolyte solution, and circumventing the problem of electronic conduction within zeolite [1, 12]. This paper will be devoted to investigate the influence of Pt particle size on electron transfer process by increasing the Pt loading from 1.5 wt% to 5 wt% on zeolite using cycle voltammetry (CV) measurement and the extended X-ray absorption fine structure (EXAFS) technique
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