Ultra-low Pt-decorated NiCu bimetallic alloys nanoparticles supported on reduced graphene oxide for electro-oxidation of methanol

Abstract

Abstract

Fabrication and characterization of NiCu/GO and NiCu/rGO nanocomposites for fuel cell application

“…GO and rGO can enhance the distribution and stability of NiCu nanoparticles, and also offer high electrical conductivity and large surface area. 66 The adsorption processes of NiCu, NiCu/GO, and NiCu/rGO for methanol and ethanol oxidation are complicated and influenced by the surface structure, composition, and morphology of the catalysts, as well as the reaction conditions. Some potential steps that are involved include the following: (a) adsorption of methanol or ethanol molecules on the catalyst surface, (b) dehydrogenation of methanol or ethanol to produce CO and H 2 , (c) oxidation of CO to CO 2 , and (d) desorption of CO 2 and H 2 O from the catalyst surface.…”

“…This is because of the cooperative effects of the Ni and Cu atoms and the favorable hydrogen adsorption energy of NiCu. 22,66 NiCu/GO and NiCu/rGO are hybrid materials that integrate the benets of NiCu alloys and graphene oxide (GO) or reduced graphene oxide (rGO) as supports. GO and rGO can enhance the distribution and stability of NiCu nanoparticles, and also offer high electrical conductivity and large surface area.…”

“…Some potential steps that are involved include the following: (a) adsorption of methanol or ethanol molecules on the catalyst surface, (b) dehydrogenation of methanol or ethanol to produce CO and H 2 , (c) oxidation of CO to CO 2 , and (d) desorption of CO 2 and H 2 O from the catalyst surface. 22,66 3.2.2. Impact of electrolyte concentrations.…”

A high-performance Pt-based catalyst for the methanol oxidation reaction: effect of electrodeposition mode and cocatalyst on electrocatalytic activity

“…Based on our previous research, NiCu nanostructures with a large surface area were chosen to function as an excellent carrier to support Pt nanoparticles, to gain high catalytic performance. 13,15,16 Different earth-abundant transition metals in combination with Pt nanoparticles have been recently studied for the MOR, e.g., Pt/F-Cu/ CuO, 12 Pt 1 Cu 0.25 ANCs/MWCNTs, 17 Pt NDs/Fe-N-S-GR, 18 PtCuFe alloy, 19 CuWPt nanoalloys, 20 PtNi NCs@HCS(COS), 21 Pt-NiCu/ rGO, 22 PtNiCu nanostructures, 23 Pt-Sn/rGO-GCN, 24 Pt@SnO 2 / G-PR, 25 Pt 3 Mn CNCs, 26 etc. Among the various transition-metal cocatalysts, Ni is considered to be a promising alternative due to its good surface oxidation properties, affordable price, and abundance in the earth.…”

“…Therefore, the accompaniment of Cu nanoparticles, also being a nonprecious metal, presents a bimetallic cocatalyst with both high conductivity and excellent activity. [21][22][23] Additionally, Cu nanoparticles possess a lower affinity for CO than Ru, Rh, Pd or Pt, so NiCu bimetal is particularly considered to be a possible alternative cocatalyst to Ni monometallic cocatalyst due to its synergistic effect. 27 Thus, the improved catalytic efficiency with a lessening of the poisoning effect could be achieved when using NiCu bimetallic as the cocatalyst.…”