Investigation of zeolite supported platinum electrocatalyst for electrochemical oxidation of small organic species

Yao, Jun; Yao, Yufeng

Abstract

© 2016 Hydrogen Energy Publications LLC 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 Article Type: Article
• Acceptance Date: Jun 9, 2016
• Online Publication Date: Jun 25, 2016
• Publication Date: Sep 7, 2016
• Deposit Date: Jun 28, 2016
• Publicly Available Date: Jun 25, 2017
• Journal: International Journal of Hydrogen Energy
• Print ISSN: 0360-3199
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 41
• Issue: 33
• Pages: 14747-14757
• DOI: https://doi.org/10.1016/j.ijhydene.2016.06.121
• Keywords: Pt on Y zeolite, H+ spillover species surface mobility, HCOOH and CH3OH oxidation, CV, EXAFS
• Public URL: https://uwe-repository.worktribe.com/output/908228
• Publisher URL: http://dx.doi.org/10.1016/j.ijhydene.2016.06.121
• Contract Date: Jun 28, 2016