Electron density regulation of Pt–Co nanoalloys via P incorporation towards methanol electrooxidation

Abstract

The activity of Pt catalyst for electro-oxidation of methanol can be greatly enhanced by coupling electron effect with morphological engineering. Herein, we report the using of bimetallic Pt-Co alloys with...

Cation Exchange between CdSe Nanocrystals and Pd2+ Cations in Different Solvent Environments toward Phase-Dependent Ethanol Oxidation Electrocatalysis

“…In general, the nonmetal element (e.g., Se here) in noble metal chalcogenides (e.g., Pd−Se here) would decrease the electron cloud density around Pd atoms due to its higher electronegativity. 50 The decrease in electron density could weaken the chemisorption of CO-like intermediates generated during the EOR process on the Pd site by inhibiting the electron back donation from the Pd atoms to their π* 2p antibonding orbitals, which is favorable for promoting the EOR at ambient conditions. 51,52 However, the higher EOR electrocatalysis of crystalline exchanged Pd 17 Se 15 particles than that of amorphous Pd−Se product is yet to be fully understood.…”

Synthesis of unconventional Pd–Se nanoparticles for phase-dependent ethanol electrooxidation

“…9 c , d ,14,16 Based on the XPS analyses mentioned above, the presence of Se induces the decrease in electron cloud density around the Pd atoms, and therefore weakens the adsorption of CO-like intermediates on the Pd sites by inhibiting the electron back-donation to the CO anti-bonding orbitals. 8 The weak adsorption of CO-like intermediates on the Pd sites could be confirmed by CO stripping curves over these Pd–Se NPs. As shown in Fig.…”

“…Theoretically, alloying a non-metal element into Pd is favourable for overcoming its susceptibility to the poisonous CO-like intermediates due to the decrease in its electron cloud density induced by non-metal elements. 8 In all studies attempting to combine non-metal elements with Pd, palladium selenides arouse great interest and show impressive potential in electrocatalysis. 9 In brief, Pd can form a number of stable alloys with selenium (Se) under ambient conditions, e.g.…”

“…Theoretically, alloying a non-metal element into Pd is favourable for overcoming its susceptibility to the poisonous CO-like intermediates due to the decrease in its electron cloud density induced by non-metal elements. 8…”

Iron- and Cobalt-Doped Palladium/Carbon Nanoparticles as Catalysts for Formic Acid Oxidation

“…According to Vegard’s law, the compositions of Fe- and Co-doped Pd nanoparticles are Pd 78 Fe 22 , Pd 73 Fe 27 , Pd 62 Fe 38 , Pd 57 Fe 43 , Pd 90 Co 10 , Pd 72 Co 28 , Pd 59 Co 41 , and Pd 55 Co 45 , respectively. The shift to higher angles of these diffraction peaks also indicates that a compressive strain is generated on the surface of the Fe/Co-doped Pd nanocrystals, which can promote the catalytic properties of Pd nanocrystals in electrocatalytic reactions. − The peak intensity of the PdFe nanoparticles is weaker than that of the PdCo nanoparticles. The possible reasons are the poor crystallization quality and surface defective atoms of the PdFe nanoparticles.…”