Electrochemical Stability of Metal Nanoparticles: the role of Size- Distribution Broadness

ROBLEDO CANDIA, LEONARDO; RUBERT, ALDO A.; FONTICELLI, MARIANO H.

Mar del Plata- Buenos Aires

Congreso; 34th Topical Meeting of the International Society of Electrochemistry; 2023

ISE- International Society of Electrochemistry

Metal nanoparticles? (MeNPs) stability has great impact in many electrochemical fields (sensors, energy storage and environmental applications). Within the context of the Gibbs-Thompson equation, the chemical potential, μ metal , of the metal raises due to the increase of the surface to volume ratio, which modify . Before getting into the models, we analyze whether E metal , for a polydisperse set of MeNPs adsorbed onto an inert substrate, is experimentally accessible (Scheme 1). In this electrochemical cell the net reaction is the formation of an ensemble of metal NPs from the bulk metal.where  is the surface tension and V molar the molar volume. Actual MeNPs are polydisperse, so they ഥ and their standard deviation,  (d) are better described by -at least- two statistical parameters, i.e., D(  (d) is the square root of the variance,  (d) 2 ). Here we address the question ?What is the redox potential of metal nanoparticles in a ispersed state?? [1]. To do so, we considered two independent models: a thermodynamic approach, which describe the MeNPs as unreactive an ensemble; and a more realistic one based on electrochemical kinetics and mixed potential theory.