Adsorption of O2 on anionic silver clusters: spins and electron binding energies dominate in the range up to nano sizes

Jun Ma; Xizi Cao; Xiaopeng Xing; Xuefeng Wang; Joel H. Parks

doi:10.1039/C5CP06116D

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Adsorption of O₂ on anionic silver clusters: spins and electron binding energies dominate in the range up to nano sizes†

Jun Ma,^a Xizi Cao,^a Xiaopeng Xing,*^a Xuefeng Wang^a and Joel H. Parks^b

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* Corresponding authors

^a Department of Chemistry, and Shanghai Key Lab of Chemical Assessment and Sustainability, Tongji University, 1239 Siping Road, Shanghai, China
E-mail: xingxp@tongji.edu.cn

^b Rowland Institute at Harvard, Cambridge, Massachusetts 02142, USA

Abstract

Exploring the reactivity of metal clusters is an important task in cluster science, while only a few previous studies involve the reactions of nano-sized ones. Here we report a kinetic measurement on reactions of Ag_n⁻ (n = 6–69) with O₂ using a flow reactor running at 120 K. Their relative rates were obtained by fitting decay processes of parent ions at different O₂ flow rates. Comparing the variations of the kinetic rates and the photodetachment energies of Ag_n⁻ (i.e. the binding energies of their excess electrons), we distinguished the separate effect of clusters' spins or their electron binding strength. This work firstly shows that reactions of O₂ and Ag_n⁻ up to nano sizes are still dominated by the clusters' global electronic properties. This conclusion is conceptually important for understanding the reaction mechanisms on silver based nanocatalysts.

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Article information

DOI: https://doi.org/10.1039/C5CP06116D
Article type: Paper
Submitted: 10 Oct 2015
Accepted: 05 Nov 2015
First published: 12 Nov 2015

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Phys. Chem. Chem. Phys., 2016,18, 743-748

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Adsorption of O₂ on anionic silver clusters: spins and electron binding energies dominate in the range up to nano sizes

J. Ma, X. Cao, X. Xing, X. Wang and J. H. Parks, Phys. Chem. Chem. Phys., 2016, 18, 743 DOI: 10.1039/C5CP06116D

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