Experimental investigation was carried out for Pt electrochemical performance and Pt particle size using 1.5 wt% and 5 wt% Pt loading on zeolite electrocatalysts made by Pt(NH 3 ) 4 (NO 3 ) 2 or Pt(NH 3 ) 4 (NO 3 ) 2 /NH 4 NO 3 salt with ion exchanged method and calcined at 350 o C and reduced at 400 o C or direct reduced at 400 o C, respectively. Cycle voltammetry measurement indicated that the hydrogen energy binding level on Pt surfaces is higher for electrocatalyst under direct reduction

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... cess than those made by calcination and reduction process. Extended X-ray adsorption fine structure measurement also 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 has depicted by a hypothesis of hydrogen spillover and surface conductance pathway.