RT journal article
T1 Influence of the Au-Ag morphology in the electrocatalytic reduction of organic halides
A1 Barlocco, Ilaria
A1 Cattaneo, Stefano
A1 Bellomi, Silvio
A1 Stucchi, Marta
A1 Pifferi, Valentina
A1 Delgado Jaén, Juan José
A1 Chen, Xiaowei
A1 Falciola, Luigi
A1 Prati, Laura
A1 Villa, Alberto
A2 Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
K1 Bimetallic catalyst
K1 Gold
K1 Silver
K1 Electrocatalysis
K1 Organic halides
AB Bimetallic gold-silver nanoparticles (NPs) have unique chemical and physical properties due to the synergisticeffect of the two metals. From a catalytic point of view, supported AuAg NPs possess different propertiesdepending 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 thendeposited on high heat-treated (HHT) carbon nanofibers characterised through high-resolution transmissionmicroscopy 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-shellstructures, Ag@Au and Au@Ag. In the first case, the structure presents a silver shell and a gold core, while thesecond possesses a silver core covered in gold. Finally, the catalysts were tested in the electrocatalytic reductionof organic halides, i.e. acetobromo-α-D-glucose and benzyl bromide, two model well-studied molecules, andcompared with the catalytic performance of the respective monometallic counterparts. For both the substratesthe bimetallic NPs showed an increased reactivity compared to the monometallic counterparts, underlining thesynergistic effect of the two metals. More importantly, the different structures assumed by the NPs had an impacton the catalytic activity. Indeed, the Ag@Au/HHT catalyst showed the lowest reduction potential for thereduction of acetobromo-α-D-glucose, while for benzyl bromide reduction the random alloy results to be the bestemployed catalyst.
PB Elsevier
SN 2468-8231
YR 2024
FD 2024-12-12
LK http://hdl.handle.net/10498/35865
UL http://hdl.handle.net/10498/35865
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 12-nov-2026