Jump to main content
Jump to site search


Controlling Ag-Doping in [AgxAu25-x(SC6H11)18]– Nanoclusters, Cryogenic Optical, Electronic and Electrocatalytic Properties

Abstract

Doping metal nanoclusters with a second type of metal is a powerful method for tuning the physicochemical properties of nanoclusters at atomic level and also provides opportunities for fundamental understanding of alloying rules as well as new applications. Herein, we have devised a new, one-phase strategy for achieving heavy Ag-doping in Au25(SR)18 nanoclusters. This strategy overcomes the light doping of silver by previous methods. X-Ray crystallography together with ESI-MS determined the composition of the product to be [AgxAu25-x(SC6H11)18]– with x~21. Cryogenic optical spectroscopy (80-300K) revealed fine features in optical absorption peaks. Interestingly, heavy doping of silver leads no significant change to electron-phonon coupling strength and the surface phonon frequency. DFT simulations reproduced the experimentally observed trend of electronic structure evolution with Ag doping. We further investigated the electrocatalytic performance of such heavily Ag-doped nanoclusters for oxygen reduction in alkaline solutions. The mass activity of ligand-off [AgxAu25-x(SC6H11)18]– nanoclusters ( 217.4 A g-1metal) was determined to be higher than that of ligand-on nanoclusters ( 29.6 A g-1metal) at the potential of -0.3 V (vs. Ag/AgCl). The rotating disk electrode (RDE) studies revealed the tunable kinetic features of the nanoclusters by ligand removal.

Back to tab navigation

Supplementary files

Publication details

The article was received on 08 Aug 2017, accepted on 05 Nov 2017 and first published on 09 Nov 2017


Article type: Paper
DOI: 10.1039/C7NR05871C
Citation: Nanoscale, 2017, Accepted Manuscript
  •   Request permissions

    Controlling Ag-Doping in [AgxAu25-x(SC6H11)18]– Nanoclusters, Cryogenic Optical, Electronic and Electrocatalytic Properties

    R. Jin, R. Jin, S. Zhao, C. Liu, M. Zhou, G. Panapitiya, Y. Xing, N. L. Rosi and J. P. Lewis, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR05871C

Search articles by author

Spotlight

Advertisements