Abstract
The catalytic activity of Au and Au–Pd core–shell nanoparticles is investigated at the liquid–liquid interface. The particles are shown to catalyse a process which is attributed to interfacial oxygen reduction. The Au–Pd particles are shown to be more active and correlations made between the catalytic activity and particle radius, surface area and concentration give insight into the mechanism of the catalytic process. Comparison is also made with an analogous bipolar configuration, formed by making contact between the liquid half-cells using a gold wire.
Highlights
Electrochemistry at the interface between two immiscible electrolyte solutions (ITIES) has become an important sub-domain of electrochemistry
The effect of gold particles supported on a solid substrate on the catalysis of the oxygen reduction reaction (ORR) has been widely investigated and a higher activity towards the 4-electron step reaction has been found for smaller particles [20,22,25]
In this paper we present a new approach to study the electrocatalytic activity of nanomaterials for ORR through adsorption at the liquid–liquid interface
Summary
Electrochemistry at the interface between two immiscible electrolyte solutions (ITIES) has become an important sub-domain of electrochemistry. Ion transfer, assisted ion transfer and electron transfer are possible and more complex reactions can occur at the interface, which involve coupled ion and electron transfer. There has been considerable interest in the catalysis of reactions, such as the oxygen reduction reaction (ORR) or hydrogen evolution reaction (HER), at the liquid–liquid interface. The HER at the liquid–liquid interface without any catalyst present [9] and its catalysis through the adsorption of molybdenum disulfide has been investigated [7] under anaerobic conditions. The mechanism proposed is a proton-coupled electron transfer (PCET). The proton is transferred from the aqueous phase to the organic phase upon which it is reduced to hydrogen in the organic
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