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Novel Hybrid Catalyst for the Oxidation of Organic Acids: Pd Nanoparticles Supported on Mn‐N‐3D‐Graphene Nanosheets
Author(s) -
Perry Albert,
Kabir Sadia,
Matanovic Ivana,
Chavez Madelaine Seow,
Artyushkova Kateryna,
Serov Alexey,
Atanassov Plamen
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700285
Subject(s) - dehydrogenation , catalysis , formic acid , oxalic acid , graphene , nanoparticle , inorganic chemistry , electrochemistry , chemistry , materials science , organic chemistry , nanotechnology , electrode
This paper reports the fabrication and electrochemical performance of a hybrid catalyst composed of Pd nanoparticles and atomically dispersed Mn active centers integrated into the nitrogen‐doped three‐dimensional graphene nanosheets (Pd/Mn−N‐3D‐GNS). Our results show that the synergistic integration of both Pd nanoparticles and atomically dispersed Mn can be used to enhance the activity toward the electrochemical oxidation of organic acids at biologically relevant pH values. The hybrid catalyst (Pd/Mn−N‐3D‐GNS) showed increased maximum currents toward the oxidation of oxalic acid when compared to its individual catalysts, namely, Pd/3D‐GNS and Mn−N‐3D‐GNS catalysts. The hybrid also showed a decreased onset potential for oxidation of mesoxalic acid as compared to Mn−N‐3D‐GNS and decreased onset potentials for the oxidation of glyoxalic acid when compared to both of its constituent catalysts. Oxidation of formic acid was also tested and the hybrid was shown to catalyze both dehydration and dehydrogenation mechanisms of formic acid electro‐oxidation. Using density functional theory calculations, it was elucidated that a two‐site catalysis most likely promotes dehydrogenation reaction for formic acid oxidation, which can explain the selectivity of Pd nanoparticles and atomically dispersed Mn towards the dehydrogenation/dehydration pathway.