Catalytically active silver nanoparticles stabilized on a thiol-functionalized metal–organic framework for an efficient hydrogen evolution reaction. Issue 46 (15th November 2022)

• Record Type: Journal Article
• Authors: Muhamed, Shamna; Aparna, Ravari Kandy; Karmakar, Arun; Kundu, Subrata; Mandal, Sukhendu
• Is Part Of: Nanoscale. Volume 14:Issue 46(2022)
• Page Start: 17345
• Page End: 17353
• Publication Date: 2022-11-15
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d2nr05460d
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Nearly monodispersed Ag nanoparticles of variable sizes were anchored on a post-synthetically modified thiol-functionalized NU-1000 metal–organic framework, which exhibited very good activity in the hydrogen evolution reaction. Abstract : A post-synthetic technique, Solvent Assisted Ligand Incorporation (SALI), was used for thiol functionalization in the zirconium-based metal–organic framework NU-1000. This thiol-functionalized MOF was employed as a support for the growth of silver nanoparticles (Ag NPs) through coordination of a Ag(i ) complex with a node-anchored thiol-ligand, followed by the reduction of Ag(i ) to Ag(0). X-ray photoelectron spectroscopy revealed that the ratio of Ag(0) to Ag(i ) proportionally increased with the loading of silver ions. The HER activity increased with the enhancement of Ag(0) in the system and the best efficiency was observed for the composite with ∼95% Ag(0). This composite displayed an overpotential of 165 mV in an acidic medium at 10 mA cm −2 and a Tafel slope of 53 mA dec −1 . The loading of silver beyond the optimum value led to the aggregation of the particles which affected the overpotential substantially. The catalyst demonstrated appreciable static stability for 24 h, which promotes the use of the material as an HER catalyst. Therefore, these results emphasized that Ag NPs embedded onto a thiol-functionalized MOF is a propitious material for developing a clean and renewable energy source.