In:
ChemElectroChem, Wiley, Vol. 4, No. 8 ( 2017-08), p. 1950-1958
Abstract:
Pt 3 Sn 2 (a : a) electrocatalysts with 20 % metal loading on multiwalled carbon nanotube supports functionalized with carboxylic acid groups (MWCNT‐COOH) were prepared for studies on the ethanol oxidation reaction (EOR). Preparing and anchoring of the metallic nanoparticles increased the hydrophilicity of MWCNT‐COOH and decreased its surface roughness to a value close to that of the commercial electrocatalyst Pt 3 Sn 1 /C E‐TEK. Pt 3 Sn 2 /MWCNT‐COOH consisted of 32 % Pt 3 Sn alloy with a lattice parameter of 0.3979 nm. The mean particle size of 3.85±1.17 nm was measured by high‐resolution transmission electron microscopy (HRTEM). The onset oxidation potential obtained for the EOR (in the cyclic voltammetry experiments) using Pt 3 Sn 2 /MWCNT‐COOH was the lowest (0.21 V vs. reversible hydrogen electrode (RHE)), with a normalized current peak of 250 mA mg Pt −1 . The highest normalized current in the chronoamperometric measurements for the EOR after 1800 seconds at 0.5 V (RHE) was 16 mA mg Pt −1 , whereas for Pt 3 Sn 1 /C E‐TEK it was 10 mA mg Pt −1 . FTIR‐ATR in situ analysis showed that the Pt 3 Sn 2 /MWCNT‐COOH electrocatalyst favoured acetaldehyde production at lower potentials and CO 2 production at potentials greater than 0.5 V. In addition, the presence of oxygenated functional groups on the nanotube surfaces together with the anchoring of Pt and SnO 2 formation contributed to the oxidation of ethanol to CO 2 (bifunctional mechanism), enhancing the electrocatalytic activity of the material compared to commercial Pt 3 Sn 1 /C E‐TEK.
Type of Medium:
Online Resource
ISSN:
2196-0216
,
2196-0216
DOI:
10.1002/celc.201700326
Language:
English
Publisher:
Wiley
Publication Date:
2017
detail.hit.zdb_id:
2724978-5
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