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October 15, 2014

VIP: Non-Invasive Probing of Nanoparticle Electrostatics

Dr. Kristina Tschulik, Dr. Wei Cheng, Dr. Christopher Batchelor-McAuley, Stuart Murphy, Dr. Dario Omanović and Prof. Dr. Richard G. Compton

Non-Invasive Probing of Nanoparticle ElectrostaticsNot what you might think: A new and non-invasive technique to probe the electrostatic interaction between surface-charged nanoparticles and a charged metal/solution interface shows that electrostatic effects are insignificant in all but very dilute electrolytes.

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    What potential! Intermediate coverage during the hydrogen oxidation/evolution reaction is determined from the Δμ X-ray absorption near-edge structure at potentials above 0.0 V and from previously reported cyclic voltammetry impedance data at potentials below 0 V on Pt surfaces. A rearrangement of overpotential deposited hydrogen (Hopd) from the ontop sites at the corners/edges of nanoparticles (green; see figure) to the delocalized threefold face sites (red) at higher Hopd coverage is found.

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