Electrochemical and electrocatalytic performance of single Au@Pt/Au bimetallic nanoparticles

Recent Developments in Single-Entity Electrochemistry

“…When this approach was extended to the nucleation of single nanobubbles, the modulation of nanobubbles in ionic liquids was examined. , These advances provide valuable insights into the dynamics and mechanisms of nanoparticle and nanobubble nucleation relevant to electrocatalysis. Furthermore, building on early works that demonstrated the voltammetric electrocatalytic investigation of single nanoparticles immobilized on nanoelectrodes, , recent reports have correlated electrocatalytic activity with structural features of single-entity electromaterials. − Bimetallic nanoparticles and nickel-based metal–organic framework particles were studied for formic acid oxidation and oxygen evolution reaction (OER), respectively, demonstrating dependencies of electrocatalytic activity and turnover frequency on particle size, sheet thickness, elemental composition, and fractional coverage. Notably, structure–property investigation of these kinds would be daunting with ensemble measurements due to the lack of accessible synthetic techniques to make monodisperse nanoparticle samples.…”

“…While the examples above highlight what can be gained from nanoelectrode SEE measurements, sequestering of nanoparticles with fidelity remains a challenge. Immobilizing presynthesized nanoparticles via approaches such as adsorption from nanoparticle suspensions, electrostatic attachment, and chemical binding to a nanoelectrode can be time-consuming, impact the resulting electrochemical signal, and offer limited control for consistently retaining only one nanoparticle on a nanoelectrode for ideal single-entity (SE) measurements. Also, electrodeposition of particles directly onto support electrodes often limits control of nanoparticle shape and surface structure .…”