Use of graphene-supported manganite nano-composites for methanol electrooxidation

Binary nano-composites of palladium and a metal (Fe or Cu) manganite on graphene nanosheets (GNS) have been prepared by a microwave-assisted polyol reduction method and investigated as electrocatalysts for the methanol oxidation reaction (MOR) in 1 M KOH at 25 degree C. Structural and electrocatalyt...

Full description

Saved in:
Bibliographic Details
Published in:International journal of hydrogen energy 2014-12, Vol.39 (35), p.20151-20158
Main Authors: SHARMA, C. S, SINHA, A. S. K, SINGH, R. N
Format: Article
Language:English
Subjects:
Alternative fuels. Production and utilization
Applied sciences
Catalysis
Catalysts
Electrodes
Energy
Exact sciences and technology
Fuels
Hydrogen
Manganites
Methyl alcohol
Nanostructure
Oxides
Palladium
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Binary nano-composites of palladium and a metal (Fe or Cu) manganite on graphene nanosheets (GNS) have been prepared by a microwave-assisted polyol reduction method and investigated as electrocatalysts for the methanol oxidation reaction (MOR) in 1 M KOH at 25 degree C. Structural and electrocatalytic surface characterizations of composites are carried out by X-ray diffraction, transmission electron microscopy, X-ray photoelectron microscopy, cyclic voltammetry and chronoamperometry. Results show that new composite catalysts, particularly 40 wt%Pd-x wt%FeMn sub(2)O sub(4)/GNS (where x = 5, 8, 10 & 15) are MOR active and that the activity is the greatest with the catalyst containing 8 wt% of the oxide. The composite, Pd-8 wt%FeMn sub(2)O sub(4)/GNS, exhibits much superior catalytic activity as well as stability compared to the base (Pd/GNS) electrode. The enhanced catalytic activity and stability of the Pd/GNS catalyst in presence of the oxide can be ascribed to increased population of adsorbed OH super(-) ions/OH radicals at the electrode surface.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2014.10.019