Negative Charging of Au Nanoparticles during Methanol Synthesis from CO₂/H₂ on a Au/ZnO Catalyst: Insights from Operando IR and Near‐Ambient‐Pressure XPS and XAS Measurements

Abstract

Supportinginformation and the ORCID identification number for one of the authors of this article can be found under: https://doi.

Changes of Pd Oxidation State in Pd/Al2O3 Catalysts Using Modulated Excitation DRIFTS

“…A broad band of similar shape and position is also observed when hydrogen spillover occurs from metal nanoparticles deposited on TiO 2 to the semiconductor, which causes Ti 4+ reduction [7,9]. The single beam diffuse reflectance IR spectra of Au/ZnO were shown to exhibit a complete loss of reflectance in Ar at 400 • C, which re-appeared in the subsequent treatment in O 2 at the same temperature in agreement with the generation of oxygen vacancies in ZnO under reducing conditions [10]. The changes in absorption are mirrored by changes in the baseline position (absorbance) in the corresponding background-subtracted spectra.…”

Highly dispersed boron-nitride/CuO -supported Au nanoparticles for catalytic CO oxidation at low temperatures

“…5). After CO adsorption saturation, three bands at 2077, 2122, and 2168 cm -1 are observed for Au/BN, which may be ascribed to the absorption of CO adsorbed on Au δ-, Au 0 , and Au δ+ species, respectively [34][35][36][37][38]. The intensity of the CO absorption peak around 2122 cm -1 is higher for Au-CuOx/BN than for Au/BN owing to the existence of Cu + in the former [27,39,40].…”

Green Synthesis of Luminescent Gold-Zinc Oxide Nanocomposites: Cell Imaging and Visible Light–Induced Dye Degradation

“…Au-metal oxide nanocomposites are known not only for their high surface-area-to-volume ratio but also for enhanced stability during their catalytic activity (Li et al, 2011;Ray and Pal, 2017;Wei et al, 2017;Cyganowski et al, 2019;Kauffman et al, 2019;Mageed et al, 2019). These hybrid nanomaterials possess unique optical, electronic, and magnetic properties, which are governed by their structural features, size, and compositional heterogeneities (Zu et al, 2015;Chamorro et al, 2016;Dutta Chowdhury et al, 2017;Lee et al, 2017;Song et al, 2017;Hu et al, 2018;.…”