Green synthesis of PdCu supported on graphene/polyoxometalate LBL films for high-performance formic acid oxidation

Abstract

PdCu alloy nanoparticles (with sizes of ca. 4.5 nm) have been synthesized by a one-step electrochemical process on composite films constructed from functionalized graphene (GN) and H 3 PMo 12 O 40 (PMo 12 ) by LBL assembly. The as-prepared hybrid displays enhanced eletrocatalytic activity and extended durability towards formic acid oxidation in an acid media.

High‐Performance Electrocatalytic Activity of Palladium‐Copper Nanoalloy towards Methanol Electro‐oxidation in an Alkaline Medium

“…The characteristic peaks at 335.1 eV and 340.5 eV correspond to Pd 3d 5/2 and 3d 3/2 bands and at 933.1 eV and 953.0 eV correspond to Cu 2p 3/2 and 2p 1/2 bands respectively. Compared with pure PdNPs and CuNPs, the peaks for Pd and Cu in PdCu nanoalloy exhibit a shift in their binding energy which reveals a change in electron density around Pd and Cu atomic orbital leading to the alloy formation .…”

Porous three-dimensional network of Pd–Cu aerogel toward formic acid oxidation

“…The intense decay in current density because of the production and adsorption of intermediate carbonaceous species on the catalysts surface goes along with the block of active sites as well as poisoning of catalysts surface. [30][31][32][33][34][35][36][37][38][39][40] Aer an early intense drop in performance, the current densities were stabilized at 5.2 and 45.6 mA cm À2 for Pd/C and Pd-Cu aerogel, respectively. The very high catalytic activity and durability of the Pd-Cu aerogel than that of Pd/C are attributed to the two vital reasons: (1) the presence of abundant open pores as well as easy access to large active sites of Pd-Cu aerogel, and (2) the selfsupporting property of the Pd-Cu aerogel, which may hinder the loss of stability observed in Pd supported on carbon owing to corrosion.…”

Hydrogen co-reduction synthesis of PdPtNi alloy nanoparticles on carbon nanotubes as enhanced catalyst for formic acid electrooxidation

“…PdPtNi/MWCNT (curve a) in the forward scan is 2230.5 mA mg À1 Pd , much higher than that on the PdPt/ MWCNT (curve b, 1358.2 mA mg À1 Pd ) and commercial Pd/C (curve c, 846.6 mA mg À1 Pd ) catalysts. It is noted that the mass activity of the PdPtNi/MWCNTs is also higher than that of recent state-of-art Pd-based alloy catalysts such as PdNi/rGO composite [17], carbon-supported PdSn nanoparticles [19], PdeCo nanoassemblies [42] and PdCu@PDDA-GN/PMo 12 hybrid [43]. This result demonstrates that the PdPtNi/MWCNT exhibits higher electrocatalytic activity for FAO than the PdPt/ MWCNT and commercial Pd/C catalysts.…”