Charge distribution and Fermi level in bimetallic nanoparticles

Physical Chemistry Chemical Physics : PCCP
Nico HolmbergPekka Peljo

Abstract

Upon metal-metal contact, a transfer of electrons will occur between the metals until the Fermi levels in both phases are equal, resulting in a net charge difference across the metal-metal interface. Here, we have examined this contact electrification in bimetallic model systems composed of mixed Au-Ag nanoparticles containing ca. 600 atoms using density functional theory calculations. We present a new model to explain this charge transfer by considering the bimetallic system as a nanocapacitor with a potential difference equal to the work function difference, and with most of the transferred charge located directly at the contact interface. Identical results were obtained by considering surface contacts as well as by employing a continuum model, confirming that this model is general and can be applied to any multimetallic structure regardless of geometry or size (going from nano- to macroscale). Furthermore, the equilibrium Fermi level was found to be strongly dependent on the surface coverage of different metals, enabling the construction of scaling relations. We believe that the charge transfer due to Fermi level equilibration has a profound effect on the catalytic, electrocatalytic and other properties of bimetallic particl...Continue Reading

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Citations

May 14, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Pekka PeljoHubert H Girault
Feb 9, 2017·Chemical Society Reviews·Dongping ZhanZhong-Qun Tian
Feb 17, 2018·Advanced Materials·Hao FangQingsheng Wu
Nov 3, 2016·Physical Chemistry Chemical Physics : PCCP·Xiaolei ZhangBing Zhao
Sep 3, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Chih-Kai LiaoMahmoud A Mahmoud

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