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      Rare earth element based single-atom catalysts: synthesis, characterization and applications in photo/electro-catalytic reactions

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          Abstract

          The synthesis, characterization, and applications of rare earth-based single-atom catalysts.

          Abstract

          Rare earth elements play an important role in various fields, which has attracted increasing interest from the scientific community. Meanwhile, single-atom catalysts show huge advantages in many aspects compared with traditional nanomaterials due to their 100% atomic utilization efficiency. Thus, the combination of the two concepts has yielded an efficient way to realize the high-value utilization of rare earth elements. In this mini-review, rare earth-based single-atom catalysts including their synthesis methods, characterization means and corresponding applications are constructively summarized and discussed. In particular, the important roles of rare earth elements as active centers in photo/electrocatalytic reactions are focused on. Finally, future prospects are also provided.

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          Single-atom catalysis of CO oxidation using Pt1/FeOx.

          Platinum-based heterogeneous catalysts are critical to many important commercial chemical processes, but their efficiency is extremely low on a per metal atom basis, because only the surface active-site atoms are used. Catalysts with single-atom dispersions are thus highly desirable to maximize atom efficiency, but making them is challenging. Here we report the synthesis of a single-atom catalyst that consists of only isolated single Pt atoms anchored to the surfaces of iron oxide nanocrystallites. This single-atom catalyst has extremely high atom efficiency and shows excellent stability and high activity for both CO oxidation and preferential oxidation of CO in H2. Density functional theory calculations show that the high catalytic activity correlates with the partially vacant 5d orbitals of the positively charged, high-valent Pt atoms, which help to reduce both the CO adsorption energy and the activation barriers for CO oxidation.
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            Single-Atom Catalysts: Synthetic Strategies and Electrochemical Applications

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              Chemical Synthesis of Single Atomic Site Catalysts

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                Author and article information

                Contributors
                Journal
                NHAOAW
                Nanoscale Horizons
                Nanoscale Horiz.
                Royal Society of Chemistry (RSC)
                2055-6756
                2055-6764
                December 20 2021
                2022
                : 7
                : 1
                : 31-40
                Affiliations
                [1 ]Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin 300350, China
                [2 ]Research School of Chemistry, Australian National University, ACT 2601, Australia
                Article
                10.1039/D1NH00459J
                d8344aac-3332-45aa-b9dc-355d6b0f3459
                © 2022

                http://rsc.li/journals-terms-of-use

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