Please use this identifier to cite or link to this item:
Title: Scalable two-step annealing method for preparing ultra-high-density single-atom catalyst libraries
Authors: Hai, Xiao
Xi, Shibo
Mitchell, Sharon
Harrath, Karim
Xu, Haomin
Akl, Dario Faust
Kong, Debin
Li, Jing
Li, Zejun
Sun, Tao
Yang, Huimin
Cui, Yige
Su, Chenliang
Zhao, Xiaoxu
Li, Jun
Pérez-Ramírez, Javier
Lu, Jiong
Keywords: Engineering::Materials
Issue Date: 2022
Source: Hai, X., Xi, S., Mitchell, S., Harrath, K., Xu, H., Akl, D. F., Kong, D., Li, J., Li, Z., Sun, T., Yang, H., Cui, Y., Su, C., Zhao, X., Li, J., Pérez-Ramírez, J. & Lu, J. (2022). Scalable two-step annealing method for preparing ultra-high-density single-atom catalyst libraries. Nature Nanotechnology, 17(2), 174-181.
Project: R-143-000-B47-114
EDUN C-33-18-279-V12
Journal: Nature Nanotechnology
Abstract: The stabilization of transition metals as isolated centres with high areal density on suitably tailored carriers is crucial for maximizing the industrial potential of single-atom heterogeneous catalysts. However, achieving single-atom dispersions at metal contents above 2 wt% remains challenging. Here we introduce a versatile approach combining impregnation and two-step annealing to synthesize ultra-high-density single-atom catalysts with metal contents up to 23 wt% for 15 metals on chemically distinct carriers. Translation to a standardized, automated protocol demonstrates the robustness of our method and provides a path to explore virtually unlimited libraries of mono- or multimetallic catalysts. At the molecular level, characterization of the synthesis mechanism through experiments and simulations shows that controlling the bonding of metal precursors with the carrier via stepwise ligand removal prevents their thermally induced aggregation into nanoparticles. The drastically enhanced reactivity with increasing metal content exemplifies the need to optimize the surface metal density for a given application. Moreover, the loading-dependent site-specific activity observed in three distinct catalytic systems reflects the well-known complexity in heterogeneous catalyst design, which now can be tackled with a library of single-atom catalysts with widely tunable metal loadings.
ISSN: 1748-3387
DOI: 10.1038/s41565-021-01022-y
Schools: School of Materials Science and Engineering 
Rights: © 2021 The Author(s), under exclusive licence to Springer Nature Limited. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles

Citations 5

Updated on Sep 24, 2023

Web of ScienceTM
Citations 5

Updated on Sep 21, 2023

Page view(s)

Updated on Sep 28, 2023

Google ScholarTM




Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.