Preparation of highly dispersed CuPt nanoparticles on ionic-liquid-assisted graphene sheets for direct methanol fuel cell

Effects of the Electrodeposition Time in the Synthesis of Carbon-Supported Pt(Cu) and Pt-Ru(Cu) Core-Shell Electrocatalysts for Polymer Electrolye Fuel Cells

“…However, we have selected some values from literature in order to have a rough approach. Thus, for 2.0 M CH3OH + 0.1 M H2SO4 on Pt(Cu)/C core-shell electrocatalysts, the best mass activity at 0.7 V and 50 mV s −1 was about 250 mA mgPt −1 , for a Pt:Cu molar ratio of 0.17:0.83 [24]. Note that the linear sweep voltammograms in Figure 9 have been obtained at 20 mV s −1 and 1.0 M CH3OH.…”

“…The most part of the Pt-Cu/C catalysts in which the galvanic exchange has been used, have been prepared starting from Cu/C precursors obtained by chemical reduction of Cu 2+ [24,[26][27][28]30]. They have been mainly applied to methanol [24,28], ethanol [27] and formic acid oxidation [25,30] and oxygen reduction [26] The synthesis of nanoparticle catalysts starting from the electrochemical reduction of Cu 2+ is scarcely found in the literature [18]. There is also an additional interest in studying whether there is a further positive effect in the introduction of Ru deposited species.…”

Star-like PtCu nanoparticles supported on graphene with superior activity for methanol electro-oxidation

“…3g, a doublet peak containing a lower binding energy at 932.0 eV (Cu 2p 3/2 ) and a higher binding energy at 952.2 eV (Cu 2p 1/2 ) are discovered for the Cu 2p 3/2,1/2 spectra of PtCu/rGO. Compared to Cu (0), the peaks of Cu are also found negative shift [35]. This is similar to metallic Pt of stars-like PtCu, further suggesting the interaction between stars-like PtCu and G. Moreover, The broad peak at ca 940 eV is still discernible and indicates the presence of Cu oxidized species [37] near the surface, but larger quantity of Cu is composed of metallic Cu.…”

“…There are a high energy band (Pt 4f 5/2 ) and a low energy band (Pt 4f 7/2 ) at 74.46 and 71.10 eV, respectively. Compared with Pt/rGO [35], the peaks of Pt negative shift by 0.11 eV and 0.08 eV, respectively, further reflecting a strong interaction between Pt and Cu, also suggesting that electrons are transferred to Pt and Cu. Due to the large p-p conjugation of rGO, it can be reasonably deduced that these electrons originate from rGO, which is evidence of an interaction between stars-like PtCu and rGO [26].…”

Synthesis of platinum nanoparticles with higher stability in ionic liquid–Nafion film and their electrocatalytic application

“…Small-diameter AgPd NPs are well dispersed over the surface of the composite film, and the resulting electrode exhibits high electrocatalytic activity and stability in the electrooxidation of HCHO. In addition, Liu et al [25] synthesised uniform CuPt NPs on IL-assisted graphene. However, the application of IL with functional groups acting as a support material for metal deposition has yet to be reported.…”