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Multilayer electrodeposition of Pt onto 1–2 nm Au nanoparticles using a hydride-termination approachHere we report on hydride-terminated (HT) electrodeposition of Pt multilayers onto ∼1.6 nm Au nanoparticles (NPs). The results build on our earlier findings regarding electrodeposition of a single monolayer of Pt onto Au NPs and reports relating to HT Pt electrodeposition onto bulk Au. In the latter case, it was found that electrodeposition of Pt from a solution containing PtCl 4 2− can be limited to a single monolayer of Pt atoms if it is immediately followed by adsorption of a monolayer of H atoms. The H-atom capping layer prevents deposition of Pt multilayers. In the present report we are interested in comparing the structure of NPs after multiple HT Pt electrodeposition cycles to the bulk analog. The results indicate that a greater number of HT Pt cycles are required to electrodeposit both a single Pt monolayer and Pt multilayers onto these Au NPs compared to bulk Au. Additionally, detailed structural analysis shows that there are fundamental differences in the structures of the AuPt materials depending on whether they are prepared on Au NPs or bulk Au. The resulting structures have a profound impact on formic acid oxidation electrocatalysis.more » « less
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Lapp, Aliya S. ; Duan, Zhiyao ; Henkelman, Graeme ; Crooks, Richard M. ( , Langmuir)
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Strasser, Juliette W. ; Hersbach, Thomas J. P. ; Liu, Jing ; Lapp, Aliya S. ; Frenkel, Anatoly I. ; Crooks, Richard M. ( , ChemElectroChem)
Abstract Here we show that just three electrochemical scans to modest positive potentials result in substantial growth of 1–2 nm Au dendrimer‐encapsulated nanoparticles (DENs). We examined two sizes of Au DENs, denoted as G6‐NH2(Au147) and G6‐NH2(Au55), where G6‐NH2represents a sixth‐generation, amine‐terminated, poly(amidoamine) dendrimer and the subscripts, 147 and 55, represent the average number of atoms in each size of DENs.
Ex situ transmission electron microscopy (TEM) andin situ X‐ray absorption spectroscopy (XAS) results indicate that G6‐NH2(Au55) DENs grow to the same size as the G6‐NH2(Au147) DENs following these scans. Importantly, this growth occurs prior to the onset of detectable faradaic Au oxidation or reduction current. The observed growth in the size of the DENs directly correlates to changes in the electrocatalytic ORR activity. The key point is that after just three positive scans the G6‐NH2(Au147) and G6‐NH2(Au55) DENs are essentially indistinguishable in terms of both physical and electrocatalytic properties.