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Chen L, Klemeyer L, Ruan M, Liu X, Werner S, Xu W, Koeppen A, Bücker R, Gonzalez MG, Koziej D, Parak WJ, Chakraborty I. Structural Analysis and Intrinsic Enzyme Mimicking Activities of Ligand-Free PtAg Nanoalloys. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2206772. [PMID: 36755199 DOI: 10.1002/smll.202206772] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 01/16/2023] [Indexed: 05/11/2023]
Abstract
Nanozymes are nanomaterials with biocatalytic properties under physiological conditions and are one class of artificial enzymes to overcome the high cost and low stability of natural enzymes. However, surface ligands on nanomaterials will decrease the catalytic activity of the nanozymes by blocking the active sites. To address this limitation, ligand-free PtAg nanoclusters (NCs) are synthesized and applied as nanozymes for various enzyme-mimicking reactions. By taking advantage of the mutual interaction of zeolitic imidazolate frameworks (ZIF-8) and Pt precursors, a good dispersion of PtAg bimetal NCs with a diameter of 1.78 ± 0.1 nm is achieved with ZIF-8 as a template. The incorporation of PtAgNCs in the voids of ZIF-8 is confirmed with structural analysis using the atomic pair-distribution function and powder X-ray diffraction. Importantly, the PtAgNCs present good catalytic activity for various enzyme-mimicking reactions, including peroxidase-/catalase- and oxidase-like reactions. Further, this work compares the catalytic activity between PtAg NCs and PtAg nanoparticles with different compositions and finds that these two nanozymes present a converse dependency of Ag-loading on their activity. This study contributes to the field of nanozymes and presents a potential option to prepare ligand-free bimetal biocatalysts with sizes in the nanocluster regime.
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Affiliation(s)
- Lizhen Chen
- Fachbereich Physik, Center for Hybrid Nanostructures (CHyN), Universität Hamburg, 22761, Hamburg, Germany
| | - Lars Klemeyer
- Fachbereich Physik, Center for Hybrid Nanostructures (CHyN), Universität Hamburg, 22761, Hamburg, Germany
| | - Mingbo Ruan
- State Key Laboratory of Electroanalytical Chemistry, and Jilin Province Key Laboratory of Low Carbon Chemical Power, Changchun Institute of Applied Chemistry, Chinese Academy of Science, 5625 Renmin Street, Changchun, 130022, P. R. China
| | - Xin Liu
- Fachbereich Physik, Center for Hybrid Nanostructures (CHyN), Universität Hamburg, 22761, Hamburg, Germany
| | - Stefan Werner
- Fachbereich Chemie, Universität Hamburg, 20146, Hamburg, Germany
| | - Weilin Xu
- State Key Laboratory of Electroanalytical Chemistry, and Jilin Province Key Laboratory of Low Carbon Chemical Power, Changchun Institute of Applied Chemistry, Chinese Academy of Science, 5625 Renmin Street, Changchun, 130022, P. R. China
| | - Andrea Koeppen
- Fachbereich Chemie, Universität Hamburg, 20146, Hamburg, Germany
| | - Robert Bücker
- Centre for Structural Systems Biology (CSSB), Department of Chemistry, University of Hamburg, 22761, Hamburg, Germany
- Rigaku Europe SE, 63263, Neu-Isenburg, Germany
| | | | - Dorota Koziej
- Fachbereich Physik, Center for Hybrid Nanostructures (CHyN), Universität Hamburg, 22761, Hamburg, Germany
- The Hamburg Centre for Ultrafast Imaging, 22761, Hamburg, Germany
| | - Wolfgang J Parak
- Fachbereich Physik, Center for Hybrid Nanostructures (CHyN), Universität Hamburg, 22761, Hamburg, Germany
| | - Indranath Chakraborty
- Fachbereich Physik, Center for Hybrid Nanostructures (CHyN), Universität Hamburg, 22761, Hamburg, Germany
- School of Nano Science and Technology, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India
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Farid I, Chutia J, Bailung H. Co-sputtered low platinum loaded PtTi binary electrocatalysts for Proton Exchange Membrane (PEM) fuel cells. J CHEM SCI 2022. [DOI: 10.1007/s12039-021-02015-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Braun T, Dinda S, Pammer F, Fichtner M. Time Resolved Measurements of pH in Aqueous Magnesium‐Air Batteries during Discharge and Its Impact for Future Applications. ChemElectroChem 2022. [DOI: 10.1002/celc.202101191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Tobias Braun
- Solid-State Chemistry Helmholtz Institute Ulm Helmholtzstraße 11 89081 Ulm Germany
| | - Sirshendu Dinda
- Solid-State Chemistry Helmholtz Institute Ulm Helmholtzstraße 11 89081 Ulm Germany
| | - Frank Pammer
- Solid-State Chemistry Helmholtz Institute Ulm Helmholtzstraße 11 89081 Ulm Germany
| | - Maximilian Fichtner
- Solid-State Chemistry Helmholtz Institute Ulm Helmholtzstraße 11 89081 Ulm Germany
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Foucher AC, Marcella N, Lee JD, Rosen DJ, Tappero R, Murray CB, Frenkel AI, Stach EA. Structural and Valence State Modification of Cobalt in CoPt Nanocatalysts in Redox Conditions. ACS NANO 2021; 15:20619-20632. [PMID: 34780150 DOI: 10.1021/acsnano.1c09450] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Platinum is the primary catalyst for many chemical reactions in the field of heterogeneous catalysis. However, platinum is both expensive and rare. Therefore, it is advantageous to combine Pt with another metal to reduce cost while also enhancing stability. To that end, Pt is often combined with Co to form Co-Pt nanocrystals. However, dynamical restructuring effects that occur during reaction in Co-Pt ensembles can impact catalytic properties. In this study, model Co2Pt3 nanoparticles supported on carbon were characterized during a redox cycle with two in situ approaches, namely, X-ray absorption spectroscopy (XAS) and scanning transmission electron microscopy (STEM) using a multimodal microreactor. The sample was exposed to temperatures up to 500 °C under H2, and then to O2 at 300 °C. Irreversible segregation of Co in the Co2Pt3 particles was seen during redox cycling, and substantial changes of the oxidation state of Co were observed. After H2 treatment, a fraction of Co could not be fully reduced and incorporated into a mixed Co-Pt phase. Reoxidation of the sample increased Co segregation, and the segregated material had a different valence state than in the fresh, oxidized sample. This in situ study describes dynamical restructuring effects in CoPt nanocatalysts at the atomic scale that are crucial to understand in order to improve the design of catalysts used in major chemical processes.
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Affiliation(s)
- Alexandre C Foucher
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Nicholas Marcella
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, United States
| | - Jennifer D Lee
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Daniel J Rosen
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Ryan Tappero
- Photon Sciences Department, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Christopher B Murray
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Anatoly I Frenkel
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, United States
- Division of Chemistry, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Eric A Stach
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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