Abstract
Graphene-supported (40-x) wt% Pd x wt% Co (0≤x≤13.33) alloys/composites have been prepared by a microwave-assisted polyol reduction method and been investigated for their structural and electrocatalytic properties for the oxygen reduction reaction (ORR) in 0.5 M H2SO4 at 298 K. The study demonstrated that the bimetallic Pd-Co composite nanoparticles are, in fact, alloy nanoparticles with fcc crystalline structure. Partial substitution of Pd by Co (from 3.64 to 13.33 wt%) in 40 wt% Pd/graphene decreases the lattice parameter as well as the crystallite size and increases the apparent catalytic activity, the latter, however, being the greatest with 8 wt% Co. The ORR activity of the active 32 wt% Pd 8wt% Co is found to be considerably low when it was deposited on the support multiwall carbon nanotubes under similar conditions. The rotating disk electrode study indicated that the ORR on 32 wt% Pd 8 wt% Co/GNS in 0.5 M H2SO4 follows approximately the four-electron pathway.
Highlights
Among various direct liquid fuel cells (DLFCs), the direct methanol fuel cell (DMFC) has received the most intensive attention
X-ray diffraction (XRD) powder patterns of the electrocatalysts were recorded at the sweep rate of 3o min-1 on an X-ray diffractometer (Thermo Electron) using CuKα as the radiation source (λ=1.5418Å)
Morphology of the electrocatalyst has been studied by transmission electron microscope (TEM: JEOL, JEM 2100)
Summary
Among various direct liquid fuel cells (DLFCs), the direct methanol fuel cell (DMFC) has received the most intensive attention. The result showed the enhanced electrocatalytic activity and durability of graphene-supported metal electrodes compared with CNT or amorphous carbon supported electrodes [24,25]. Rao et al [26] synthesized graphene-supported Pt3Co and Pt3Cr alloy nanoparticles They found the ORR activity of the Pt3M (M = Co and Cr)/graphene 3-4 times higher than that of Pt/graphene. ORR activity of the electrode further, Pd-Co bimetallic nanoparticles with varying Co/Pd ratios (i.e. 1:10, 1:6, 1:4 and 1:2) by weight were deposited on GNS and their structural and electrocatalytic activities in Ar- and O2-saturated 0.5 M H2SO4 with and without containing methanol were investigated. The investigation of ORR, to our knowledge, has not been reported on graphene-supported Pd-based bimetallic NPs in acid solutions
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