Such an asymmetric charge distribution decreases adsorbate−adsorbate repulsion and facilitates C−C coupling of reaction intermediates, which otherwise occurs poorly in TNTAs decorated with small metal nanoparticles. Adjacent adsorption sites in our photocatalyst develop an asymmetric charge distribution due to quadrupole resonances in large metal nanoparticles and multipole resonances in Ag−Cu heterodimers. The ethane selectivity was the highest for AgCu-TNTA with 60.7%, while the ethane selectivity was found to be 15.9 and 10% for the Ag-TNTA and Cu-TNTA, respectively. ![]() Under identical conditions, the C x H 2x+2 production rates for Ag-TNTA and Cu-TNTA were 6.54 and 1.39 μmol g −1 h −1, respectively. Under 2 h AM1.5G 1-sun illumination, the total rate of hydrocarbon production (methane + ethane) was highest for AgCu-TNTA with a total C x H 2x+2 rate of 23.88 μmol g −1 h −1. Isotope-labeled mass spectrometry was used to verify the origin and identity of the reaction products. In this context, we report the dominant formation of a C 2 product, namely, ethane, from the gas-phase photoreduction of CO 2 using TiO 2 nanotube arrays (TNTAs) decorated with large-sized (80−200 nm) Ag and Cu nanoparticles without the use of a sacrificial agent or hole scavenger. Nanoparticles (NPs) of noble metals (gold, silver, and platinum) have attracted greater interest from researchers than bulk metals because of their unique properties, such as electronic, optical, magnetic, and catalytic properties 1, 2, 3. The formation of C 2+ products such as ethane and ethanol rather than methane is more interesting due to their higher energy density and economic value, but the formation of C−C bonds is currently a major challenge in CO 2 photoreduction. In specific, the ionic liquid-derived core–shell nanoparticles at an Au/Pd molar ratio of 1/1 exhibit the highest mass- and area-based activities, approximately 11 times than those of commercial Pd/C catalyst for ethanol electrooxidation.Cu/TiO 2 is a well-known photocatalyst for the photocatalytic transformation of CO 2 into methane. The strong electronic coupling between Au core and Pd shell endows the Pd shell with an electronic structure favorable for the ethanol oxidation reaction. 2.41 nm, which are then served as seeds for the formation of tiny core–shell nanoparticles with different Au/Pd molar ratios. ![]() ![]() Through aberration corrected-STEM, UV-vis spectroscopy and EDS chemical analysis, we were able to determine that Au(core)-Pd(shell) bimetallic nanoparticles were formed. Kinetically controlled autocatalytic chemical process for bulk production. This synthetic strategy relies on the use of an ionic liquid (1-(2′-aminoethyl)-3-methyl-imidazolum tetrafluoroborate) as a stabilizer to produce Au particles with an average size of ca. In this work, we report a facile synthesis route, structural characterization, and full atomistic simulations of gold-palladium nanoalloys. The nanoparticle dispersion was centrifuged with a Millipore spin filter (molecular weight cut-off 3 kDa, remaining volume 500 L) at 4000 rpm for 45 min. Similar Articles Gold-palladium coreshell nanoalloys: experiments and simulations. To maximize the size and structural advantages of nanomaterials in electrooxidation of ethanol, we herein report the synthesis of core–shell gold (Pd) nanoparticles smaller than 3 nm in an ionic liquid, which combines the advantages of ionic liquids in preparing fine metal nanoparticles with the benefits of core–shell nanostructures.
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