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Reduced thermal expansion by surface-mounted nanoparticles in a pillared-layered metal-organic framework. Commun Chem 2022; 5:177. [PMID: 36697751 PMCID: PMC9814677 DOI: 10.1038/s42004-022-00793-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Accepted: 12/07/2022] [Indexed: 12/24/2022] Open
Abstract
Control of thermal expansion (TE) is important to improve material longevity in applications with repeated temperature changes or fluctuations. The TE behavior of metal-organic frameworks (MOFs) is increasingly well understood, while the impact of surface-mounted nanoparticles (NPs) on the TE properties of MOFs remains unexplored despite large promises of NP@MOF composites in catalysis and adsorbate diffusion control. Here we study the influence of surface-mounted platinum nanoparticles on the TE properties of Pt@MOF (Pt@Zn2(DP-bdc)2dabco; DP-bdc2-=2,5-dipropoxy-1,4-benzenedicarboxylate, dabco=1,4-diazabicyclo[2.2.2]octane). We show that TE is largely retained at low platinum loadings, while high loading results in significantly reduced TE at higher temperatures compared to the pure MOF. These findings support the chemical intuition that surface-mounted particles restrict deformation of the MOF support and suggest that composite materials exhibit superior TE properties thereby excluding thermal stress as limiting factor for their potential application in temperature swing processes or catalysis.
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Mathiesen JK, Bøjesen ED, Pedersen JK, Kjaer ETS, Juelsholt M, Cooper S, Quinson J, Anker AS, Cutts G, Keeble DS, Thomsen MS, Rossmeisl J, Jensen KMØ. Breaking with the Principles of Coreduction to Form Stoichiometric Intermetallic PdCu Nanoparticles. SMALL METHODS 2022; 6:e2200420. [PMID: 35460216 DOI: 10.1002/smtd.202200420] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2022] [Indexed: 06/14/2023]
Abstract
Intermetallic nanoparticles (NPs) have shown enhanced catalytic properties as compared to their disordered alloy counterparts. To advance their use in green energy, it is crucial to understand what controls the formation of intermetallic NPs over alloy structures. By carefully selecting the additives used in NP synthesis, it is here shown that monodisperse, intermetallic PdCu NPs can be synthesized in a controllable manner. Introducing the additives iron(III) chloride and ascorbic acid, both morphological and structural control can be achieved. Combined, these additives provide a synergetic effect resulting in precursor reduction and defect-free growth; ultimately leading to monodisperse, single-crystalline, intermetallic PdCu NPs. Using in situ X-ray total scattering, a hitherto unknown transformation pathway is reported that diverges from the commonly reported coreduction disorder-order transformation. A Cu-rich structure initially forms, which upon the incorporation of Pd(0) and atomic ordering forms intermetallic PdCu NPs. These findings underpin that formation of stoichiometric intermetallic NPs is not limited by standard reduction potential matching and coreduction mechanisms, but is instead driven by changes in the local chemistry. Ultimately, using the local chemistry as a handle to tune the NP structure might open new opportunities to expand the library of intermetallic NPs by exploiting synthesis by design.
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Affiliation(s)
- Jette K Mathiesen
- Department of Chemistry and Nano-Science Center, University of Copenhagen, Universitetsparken 5, Copenhagen, 2100, Denmark
| | - Espen D Bøjesen
- Interdisciplinary Nanoscience Center & Aarhus University Centre for Integrated Materials Research, Aarhus University, Gustav Wieds Vej 14, Aarhus C, 8000, Denmark
| | - Jack K Pedersen
- Department of Chemistry and Nano-Science Center, University of Copenhagen, Universitetsparken 5, Copenhagen, 2100, Denmark
| | - Emil T S Kjaer
- Department of Chemistry and Nano-Science Center, University of Copenhagen, Universitetsparken 5, Copenhagen, 2100, Denmark
| | - Mikkel Juelsholt
- Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK
| | - Susan Cooper
- Department of Chemistry and Nano-Science Center, University of Copenhagen, Universitetsparken 5, Copenhagen, 2100, Denmark
| | - Jonathan Quinson
- Department of Chemistry and Nano-Science Center, University of Copenhagen, Universitetsparken 5, Copenhagen, 2100, Denmark
| | - Andy S Anker
- Department of Chemistry and Nano-Science Center, University of Copenhagen, Universitetsparken 5, Copenhagen, 2100, Denmark
| | - Geoff Cutts
- Diamond Light Source, Harwell Campus, Oxford, OX11 0DE, UK
| | - Dean S Keeble
- Diamond Light Source, Harwell Campus, Oxford, OX11 0DE, UK
| | - Maria S Thomsen
- Department of Chemistry and Nano-Science Center, University of Copenhagen, Universitetsparken 5, Copenhagen, 2100, Denmark
| | - Jan Rossmeisl
- Department of Chemistry and Nano-Science Center, University of Copenhagen, Universitetsparken 5, Copenhagen, 2100, Denmark
| | - Kirsten M Ø Jensen
- Department of Chemistry and Nano-Science Center, University of Copenhagen, Universitetsparken 5, Copenhagen, 2100, Denmark
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