Bimetallic Composition-Promoted Electrocatalytic Hydrodechlorination Reaction on Silver–Palladium Alloy Nanoparticles

Abstract

Studies of the electrocatalytic hydrodechlorination (EHDC) reaction using monodisperse AgPd nanoparticle (NP) model catalysts in the present work reveal the essential role of the catalytically inert Ag component in promoting bimetallic nanocatalyst's activity for the conversion of 2,4-dichlorophenol (2,4-DCP) to phenol (P). The EHDC reaction rate, current efficiency, and product selectivity were systematically investigated, leading to the observation of a volcano-type activity dependence on the Ag content in bimetallic NPs. The combination of kinetics analyses and density functional theory calculations demonstrates that the balance of 2,4-DCP adsorption and P desorption is the dominant factor for EHDC efficiency rather than other processes (e.g., hydrogen adsorbent formation). The presence of Ag, if precisely controlled in the proper range, alleviates the overstrong adsorption of P, allowing for a much enhanced EHDC kinetics compared to single-component Pd. This work provides a deep understanding of the EHDC mechanism over bimetallic nanocatalysts and a facile approach to optimizing this important environmental electrocatalysis strategy.

Electrocatalytic reduction of furfural with high selectivity to furfuryl alcohol using AgPd alloy nanoparticles

“…The Ag was anticipated to promote Pd performance for furfural electrocatalytic reduction, as our previous studies revealed that Pd was subject to over-strong adsorption of aromatic entities and could be effectively modulated by Ag alloying. 10 Similar effects have been observed in recent reports where AgPd nanoalloys were used as catalysts in different electrochemical systems. 11,12 The results herein demonstrate that bimetallic AgPd alloy nano-Scheme 1 Summary of furfural production and common electrochemical reduction products derived from furfural.…”

Electrochemically activated carbon–halogen bond cleavage and C–C coupling monitored by in situ shell-isolated nanoparticle-enhanced Raman spectroscopy

“…Another is hydrodehalogenation of the atomic hydrogen species produced on the metal surface that trigger the C-X bond cleavage. 5,46,47 This could be described as follows:…”

Dual‐Metal Sites Boosting Polarization of Nitrogen Molecules for Efficient Nitrogen Photofixation

“…In this regard, dual-metal sites with different metallicities and d orbitals can induce polarization in N 2 molecules to a larger extent (Figure 1B). [31][32][33] Therefore, constructing dual-metal sites could provide new opportunities to develop highly efficient catalysts for N 2 fixation.…”