INVESTIGATION OF STRUCTURAL, MICROSTRUCTURAL AND ELECTROCHEMICAL CHARACTERISTICS OF Pt/SnOx-C ELECTROCATALYSTS PREPARED VIA ELECTROCHEMICAL DISPERSION OF TIN AND PLATINUM

• Published in: IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA Vol. 62; no. 9; pp. 53 - 59
• Main Authors: Kuriganova, Alexandra B., Smirnova, Nina V., Leontyev, Igor N., Avramenko, Marina V.
• Format: Journal Article
• Language: English; Russian
• Published: 01.01.2019
• ISSN: 0579-2991; 2500-3070
• DOI: 10.6060/ivkkt.20196209.5945

Tin oxides powders (SnOx) with different structure and composition and Pt/SnOx-C electrocatalysts for the direct ethanol fuel cells have been prepared via the electrochemical dispersion of tin and platinum electrodes under a pulse alternating current using various types of anion electrolytes (Cl- and F- anions). As-prepared tin oxides powders, SnOx-C composite supports and Pt/SnOx-C catalysts have been examined by different methods: X-ray diffraction, Raman spectroscopy, scanning electron microscopy and transmission electron microscopy. SnO2 nanoparticles with average sizes of 5 – 8 nm was prepared in a Cl- – containing solution. In turn, the F- – containing solution was found to contain SnO nanoparticles with pronounced shape anisotropy and diverse size of particles. These tin oxides were used as precursors in the synthesis of Pt/SnOx-C catalysts (20% Pt loading, D111=10.5 – 13.5 nm) by the same pulse alternating current technique. Electrochemical active surface area of the Pt/SnOx-C electrocatalysts determined via CO-stripping method was 13-15 m2g-1. Electrocatalytic activity of the electrocatalysts was study for the ethanol electrochemcail oxidation reaction by cyclic voltammetry, rotating disc electrode technique. It was found that the presence of tin oxides is found to exert the same promoting effect on the CO-stripping and ethanol electrochemical oxidation reaction independently on structural features of their particles.