Kinetically controlled synthesis of atomically precise silver nanocluster for catalytic reduction of 4-nitrophenol
3 August 2020
Revised: 3 September 2020
Accepted: 4 September 2020
Available online: 5 September 2020
Abstract: It is challenging to synthesize atom-precise silver nanoclusters (NCs), which is essential for the development of NCs. In this study, we report the synthesis of atom-precise silver NCs in high purity by a kinetically controlled strategy. The silver NCs were prepared using a mild reducing agent via a one-pot method. The as-prepared silver NCs were confirmed to be Ag49(D-pen)24 (D-pen: D-penicillamine) based on the discussion of matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) and thermogravimetry (TG) characterizations. Interface structures of the silver NCs were illustrated by both 1H-NMR and FTIR spectroscopy. The silver NCs were supported on the active carbon (AC) to form the Ag NCs/AC which displayed excellent activity for the catalytic reduction of 4-nitrophenol with the kinetic reaction rate constant k of 0.21 min−1, outperforming several catalysts reported previously. Besides, the catalytic activity of Ag NCs/AC kept almost constant after six times of recycle, suggesting its good stability.