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Robust 2 nm-sized gold nanoclusters on Co 3 O 4 for CO oxidation.

Authors :: Shi Q
Li Z
Cao C
Li G
Barkaoui S
Source :: Nanoscale advances [Nanoscale Adv] 2023 Sep 05; Vol. 5 (19), pp. 5385-5389. Date of Electronic Publication: 2023 Sep 05 (Print Publication: 2023).
Publication Year :: 2023
Abstract: In this study, gold nanoparticles were dispersed on Co <subscript>3</subscript> O <subscript>4</subscript> nanoplates, forming a specific Au-Co <subscript>3</subscript> O <subscript>4</subscript> interface. Upon calcination at 300 °C in air, aberration-corrected STEM images evidenced that the gold nanoclusters (NCs) on Co <subscript>3</subscript> O <subscript>4</subscript> {111} were maintained at ca. 2.2 nm, which is similar to the size of the parent Au colloidal particles, demonstrating the stronger metal-support interaction (SMSI) on Co <subscript>3</subscript> O <subscript>4</subscript> {111}. Au/Co <subscript>3</subscript> O <subscript>4</subscript> {111} showed good catalytic activity (a full CO conversion achieved at 80 °C) and durability (over 10 hours) in CO oxidation, which was mainly due to the promotion by the surface oxygen vacancies and intrinsic defects of Co <subscript>3</subscript> O <subscript>4</subscript> {111} for activating O <subscript>2</subscript> and by Au <superscript>0</superscript> , Au <superscript> δ +</superscript> , and Au <superscript>+</superscript> species on the surface of gold NCs for CO activation, as evidenced by Raman and Fourier-transform infrared (FT-IR) spectroscopy analysis. Au/Co <subscript>3</subscript> O <subscript>4</subscript> catalyzed CO oxidation obeyed the Langmuir-Hinshelwood mechanism at low temperatures.<br />Competing Interests: There are no conflicts to declare.<br /> (This journal is © The Royal Society of Chemistry.)