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CaO-Promoted Graphene-Supported Palladium Nanocrystals as a Universal Electrocatalyst for Direct Liquid Fuel Cells
journal contribution
posted on 2020-01-14, 22:29 authored by Umair Shamraiz, Zeeshan Ahmad, Bareera Raza, Amin Badshah, Sajid Ullah, Muhammad Arif NadeemHere, we present
the fabrication of a reduced graphene oxide-supported
PdCa (PdCa/rGO) alloyed catalyst via a NaBH4 reduction
method for direct alcohol fuel cells in basic medium and direct formic
acid fuel cells in acidic medium. Powder X-ray diffraction, energy-dispersive
X-ray spectroscopy, scanning electron microscopy, transmission electron
microscopy, high-resolution transmission electron microscopy, X-ray
photoelectron spectroscopy, Brunauer–Emmett–Teller,
inductively coupled plasma mass spectrometry, and Raman spectroscopy
are used to characterize the PdCa/rGO catalyst. We proved that the
calcium oxide significantly enhances the electrocatalytic methanol,
ethanol, and formic acid oxidation over the Pd/rGO surface. The obtained
mass activities for PdCa/rGO are 4838.06, 4674.70, and 3906.49 mA
mg–1 for formic acid, methanol, and ethanol, respectively.
Long-term stability, high activity, and high level of tolerance to
CO poisoning of the PdCa/rGO electrocatalyst are attributed to the
presence of calcium oxide. These results prove that the PdCa/rGO catalyst
has improved electrocatalytic performance for the oxidation of formic
acid, methanol, and ethanol with reference to the Pd/rGO.
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powder X-ray diffractionenergy-dispersive X-ray spectroscopyDirect Liquid Fuel CellsCaO-Promoted Graphene-Supported Palladium Nanocrystalsalcohol fuel cellsethanolplasma mass spectrometryformic acid oxidationcalcium oxideNaBH 4 reduction methodgraphene oxide-supported PdCascanning electron microscopycatalysttransmission electron microscopyformic acid fuel cellsformic acidCOmethanolX-ray photoelectron spectroscopy
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