Platinum Nanoparticle Impacts at a Liquid/Liquid Interface

Abstract : Single nanoparticle (NP) electrochemistry detection at a micro liquid|liquid interface (LLI) is exploited using the catalyzed oxygen reduction reaction (ORR). In this way, current spikes reminiscent of nanoimpacts were recorded, which corresponded to electrocatalytic enhancement of the ORR by Pt NPs. The nature of the LLI allows exploration of new phenomena in single NP electrochemistry. The recorded impacts result from a bipolar reaction occurring at the Pt NP straddling the LLI. O2 reduction takes place in the aqueous phase, while ferrocene hydride (Fc‐H+; a complex generated upon facilitated interfacial proton transfer by Fc) is oxidized in the organic phase. Ultimately, the role of reactant partitioning, NP bouncing, or the ability of NPs to induce Marangoni effects, is demonstrated.
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Talia Jane Stockmann, Leo Angele, Vitor Brasiliense, Catherine Combellas, Frederic Kanoufi. Platinum Nanoparticle Impacts at a Liquid/Liquid Interface. Angewandte Chemie (English Edition), John Wiley & Sons, 2017, 56 (43), pp.13493-13497. ⟨10.1002/anie.201707589⟩. ⟨hal-01767804⟩

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