Open AccessINVESTIGATION OF STRUCTURAL, MICROSTRUCTURAL AND ELECTROCHEMICAL CHARACTERISTICS OF Pt/SnOx-C ELECTROCATALYSTS PREPARED VIA ELECTROCHEMICAL DISPERSION OF TIN AND PLATINUM
Author(s) -
Alexandra B. Kuriganova,
Nina Smirnova,
Igor N. Leontyev,
Marina Avramenko
Publication year - 2019
Publication title -
izvestiâ vysših učebnyh zavedenij. himiâ i himičeskaâ tehnologiâ/izvestiâ vysših učebnyh zavedenij. seriâ himiâ i himičeskaâ tehnologiâ
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.221
H-Index - 5
eISSN - 2500-3070
pISSN - 0579-2991
DOI - 10.6060/ivkkt.20196209.5945
Subject(s) - tin , electrochemistry , materials science , platinum , cyclic voltammetry , catalysis , chemical engineering , tin dioxide , inorganic chemistry , electrocatalyst , tin oxide , scanning electron microscope , electrode , chemistry , metallurgy , composite material , organic chemistry , oxide , engineering
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.