@misc{10498/35865,
year = {2024},
month = {12},
url = {http://hdl.handle.net/10498/35865},
abstract = {Bimetallic gold-silver nanoparticles (NPs) have unique chemical and physical properties due to the synergistic
effect of the two metals. From a catalytic point of view, supported AuAg NPs possess different properties
depending on their structure, e.g. random alloy or core-shell. Herein, we synthesised bimetallic Au-Ag nanoparticles using a sol-immobilisation method to obtain different bimetallic structures. These colloids were then
deposited on high heat-treated (HHT) carbon nanofibers characterised through high-resolution transmission
microscopy coupled with energy-dispersive X-ray spectroscopy (HRTEM-EDX), and cyclic voltammetry (CV).
Combining these complementary techniques revealed the formation of a random alloy, AuAg, and two core-shell
structures, Ag@Au and Au@Ag. In the first case, the structure presents a silver shell and a gold core, while the
second possesses a silver core covered in gold. Finally, the catalysts were tested in the electrocatalytic reduction
of organic halides, i.e. acetobromo-α-D-glucose and benzyl bromide, two model well-studied molecules, and
compared with the catalytic performance of the respective monometallic counterparts. For both the substrates
the bimetallic NPs showed an increased reactivity compared to the monometallic counterparts, underlining the
synergistic effect of the two metals. More importantly, the different structures assumed by the NPs had an impact
on the catalytic activity. Indeed, the Ag@Au/HHT catalyst showed the lowest reduction potential for the
reduction of acetobromo-α-D-glucose, while for benzyl bromide reduction the random alloy results to be the best
employed catalyst.},
publisher = {Elsevier},
keywords = {Bimetallic catalyst},
keywords = {Gold},
keywords = {Silver},
keywords = {Electrocatalysis},
keywords = {Organic halides},
title = {Influence of the Au-Ag morphology in the electrocatalytic reduction of organic halides},
doi = {10.1016/j.mcat.2024.114762},
author = {Barlocco, Ilaria and Cattaneo, Stefano and Bellomi, Silvio and Stucchi, Marta and Pifferi, Valentina and Delgado Jaén, Juan José and Chen, Xiaowei and Falciola, Luigi and Prati, Laura and Villa, Alberto},
}