کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1269351 | 1497392 | 2016 | 11 صفحه PDF | دانلود رایگان |
• Pt ion exchange with Y type zeolite and calcination and reduction.
• H+ spillover at electrode and solution interface and through zeolite framework.
• Pt particle size measurement by EXAFS.
• Pt electrocatalytic performance by CV measurement.
• Electro-oxidation of small organic species on Pt surface.
Zeolite supported Pt electrocatalysts, made by ion exchange method using Pt/Y type zeolite, have been investigated to determine Pt electrochemical activity of HCOOH and CH3OH oxidation using the cyclic voltammetry (CV) and the extended X-ray adsorption fine structure (EXAFS) techniques. The study reveals that the introduction of excess H+ ions during electrocatalyst pre-treatment could enhance electrochemical reaction on Pt surface due to higher Pt dispersion, regardless of zeolite being a direct current electronic conducting insulator. Two possible conduction pathways might contribute to the electrocatalytic reaction on Pt surface with Pt particle size and loading: (1) hydrogen atoms/H+ ions spillover through zeolite framework and at the electrode and solution interface; (2) surface mobility of adsorbed species on electrode surface. The water may act as a carrier in assisting the migration of the H+ ions throughout zeolite channels to facilitate the charger and electron transfer in such an electrical system.
Journal: International Journal of Hydrogen Energy - Volume 41, Issue 33, 7 September 2016, Pages 14747–14757