1
|
Li S, Zhou Y, Fu X, Pedersen JB, Saccoccio M, Andersen SZ, Enemark-Rasmussen K, Kempen PJ, Damsgaard CD, Xu A, Sažinas R, Mygind JBV, Deissler NH, Kibsgaard J, Vesborg PCK, Nørskov JK, Chorkendorff I. Long-term continuous ammonia electrosynthesis. Nature 2024; 629:92-97. [PMID: 38503346 DOI: 10.1038/s41586-024-07276-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Accepted: 03/06/2024] [Indexed: 03/21/2024]
Abstract
Ammonia is crucial as a fertilizer and in the chemical industry and is considered to be a carbon-free fuel1. Ammonia electrosynthesis from nitrogen under ambient conditions offers an attractive alternative to the Haber-Bosch process2,3, and lithium-mediated nitrogen reduction represents a promising approach to continuous-flow ammonia electrosynthesis, coupling nitrogen reduction with hydrogen oxidation4. However, tetrahydrofuran, which is commonly used as a solvent, impedes long-term ammonia production owing to polymerization and volatility problems. Here we show that a chain-ether-based electrolyte enables long-term continuous ammonia synthesis. We find that a chain-ether-based solvent exhibits non-polymerization properties and a high boiling point (162 °C) and forms a compact solid-electrolyte interphase layer on the gas diffusion electrode, facilitating ammonia release in the gas phase and ensuring electrolyte stability. We demonstrate 300 h of continuous operation in a flow electrolyser with a 25 cm2 electrode at 1 bar pressure and room temperature, and achieve a current-to-ammonia efficiency of 64 ± 1% with a gas-phase ammonia content of approximately 98%. Our results highlight the crucial role of the solvent in long-term continuous ammonia synthesis.
Collapse
Affiliation(s)
- Shaofeng Li
- Department of Physics, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Yuanyuan Zhou
- Department of Physics, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Xianbiao Fu
- Department of Physics, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Jakob B Pedersen
- Department of Physics, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Mattia Saccoccio
- Department of Physics, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Suzanne Z Andersen
- Department of Physics, Technical University of Denmark, Kongens Lyngby, Denmark
| | | | - Paul J Kempen
- National Centre for Nano Fabrication and Characterization, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Christian Danvad Damsgaard
- Department of Physics, Technical University of Denmark, Kongens Lyngby, Denmark
- National Centre for Nano Fabrication and Characterization, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Aoni Xu
- Department of Physics, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Rokas Sažinas
- Department of Physics, Technical University of Denmark, Kongens Lyngby, Denmark
| | | | - Niklas H Deissler
- Department of Physics, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Jakob Kibsgaard
- Department of Physics, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Peter C K Vesborg
- Department of Physics, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Jens K Nørskov
- Department of Physics, Technical University of Denmark, Kongens Lyngby, Denmark.
| | - Ib Chorkendorff
- Department of Physics, Technical University of Denmark, Kongens Lyngby, Denmark.
| |
Collapse
|
2
|
Tankard RE, Romeggio F, Akazawa SK, Krabbe A, Sloth OF, Secher NM, Colding-Fagerholt S, Helveg S, Palmer R, Damsgaard CD, Kibsgaard J, Chorkendorff I. Stable mass-selected AuTiO x nanoparticles for CO oxidation. Phys Chem Chem Phys 2024; 26:9253-9263. [PMID: 38445363 DOI: 10.1039/d4cp00211c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2024]
Abstract
Stability under reactive conditions poses a common challenge for cluster- and nanoparticle-based catalysts. Since the catalytic properties of <5 nm gold nanoparticles were first uncovered, optimizing their stability at elevated temperatures for CO oxidation has been a central theme. Here we report direct observations of improved stability of AuTiOx alloy nanoparticles for CO oxidation compared with pure Au nanoparticles on TiO2. The nanoparticles were synthesized using a magnetron sputtering, gas-phase aggregation cluster source, size-selected using a lateral time-of-flight mass filter and deposited onto TiO2-coated micro-reactors for thermocatalytic activity measurements of CO oxidation. The AuTiOx nanoparticles exhibited improved stability at elevated temperatures, which is attributed to a self-anchoring interaction with the TiO2 substrate. The structure of the AuTiOx nanoparticles was also investigated in detail using ion scattering spectroscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy. The measurements showed that the alloyed nanoparticles exhibited a core-shell structure with an Au core surrounded by an AuTiOx shell. The structure of these alloy nanoparticles appeared stable even at temperatures up to 320 °C under reactive conditions, for more than 140 hours. The work presented confirms the possibility of tuning catalytic activity and stability via nanoparticle alloying and self-anchoring on TiO2 substrates, and highlights the importance of complementary characterization techniques to investigate and optimize nanoparticle catalyst designs of this nature.
Collapse
Affiliation(s)
- Rikke Egeberg Tankard
- Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark.
| | - Filippo Romeggio
- Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark.
| | - Stefan Kei Akazawa
- Center for Visualizing Catalytic Processes (VISION), Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Alexander Krabbe
- Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark.
| | - Olivia Fjord Sloth
- Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark.
| | - Niklas Mørch Secher
- Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark.
| | - Sofie Colding-Fagerholt
- Center for Visualizing Catalytic Processes (VISION), Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Stig Helveg
- Center for Visualizing Catalytic Processes (VISION), Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Richard Palmer
- Nanomaterials Lab, Swansea University, Bay Campus, Swansea, UK
| | - Christian Danvad Damsgaard
- Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark.
- Center for Visualizing Catalytic Processes (VISION), Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
- National Centre for Nano Fabrication and Characterization, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Jakob Kibsgaard
- Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark.
- Center for Visualizing Catalytic Processes (VISION), Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Ib Chorkendorff
- Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark.
| |
Collapse
|
3
|
Sedano Varo E, Egeberg Tankard R, Kryger-Baggesen J, Jinschek J, Helveg S, Chorkendorff I, Damsgaard CD, Kibsgaard J. Gold Nanoparticles for CO 2 Electroreduction: An Optimum Defined by Size and Shape. J Am Chem Soc 2024; 146:2015-2023. [PMID: 38196113 PMCID: PMC10811675 DOI: 10.1021/jacs.3c10610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 12/19/2023] [Accepted: 12/19/2023] [Indexed: 01/11/2024]
Abstract
Understanding the size-dependent behavior of nanoparticles is crucial for optimizing catalytic performance. We investigate the differences in selectivity of size-selected gold nanoparticles for CO2 electroreduction with sizes ranging from 1.5 to 6.5 nm. Our findings reveal an optimal size of approximately 3 nm that maximizes selectivity toward CO, exhibiting up to 60% Faradaic efficiency at low potentials. High-resolution transmission electron microscopy reveals different shapes for the particles and suggests that multiply twinned nanoparticles are favorable for CO2 reduction to CO. Our analysis shows that twin boundaries pin 8-fold coordinated surface sites and in turn suggests that a variation of size and shape to optimize the abundance of 8-fold coordinated sites is a viable path for optimizing the CO2 electrocatalytic reduction to CO. This work contributes to the advancement of nanocatalyst design for achieving tunable selectivity for CO2 conversion into valuable products.
Collapse
Affiliation(s)
- Esperanza Sedano Varo
- Department
of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Rikke Egeberg Tankard
- Department
of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Joakim Kryger-Baggesen
- Center
for Visualizing Catalytic Processes (VISION), Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Joerg Jinschek
- Center
for Visualizing Catalytic Processes (VISION), Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
- National
Centre for Nano Fabrication and Characterization, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Stig Helveg
- Center
for Visualizing Catalytic Processes (VISION), Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Ib Chorkendorff
- Department
of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Christian Danvad Damsgaard
- Department
of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
- Center
for Visualizing Catalytic Processes (VISION), Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
- National
Centre for Nano Fabrication and Characterization, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Jakob Kibsgaard
- Department
of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
- Center
for Visualizing Catalytic Processes (VISION), Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| |
Collapse
|
4
|
Ma Z, Chatzichristodoulou C, Dacayan WL, Mølhave KS, Chiabrera FM, Smitshuysen TEL, Damsgaard CD, Simonsen SB. Experimental Requirements for High-Temperature Solid-State Electrochemical TEM Experiments. Small Methods 2024:e2301356. [PMID: 38195885 DOI: 10.1002/smtd.202301356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 12/06/2023] [Indexed: 01/11/2024]
Abstract
The ability to perform both electrochemical and structural/elemental characterization in the same experiment and at the nanoscale allows to directly link electrochemical performance to the material properties and their evolution over time and operating conditions. Such experiments can be important for the further development of solid oxide cells, solid-state batteries, thermal electrical devices, and other solid-state electrochemical devices. The experimental requirements for conducting solid-state electrochemical TEM experiments in general, including sample preparation, electrochemical measurements, failure factors, and possibilities for optimization, are presented and discussed. Particularly, the methodology of performing reliable electrochemical impedance spectroscopy measurements in reactive gases and at elevated temperatures for both single materials and solid oxide cells is described. The presented results include impedance measurements of electronic conductors, an ionic conductor, and a mixed ionic and electronic conductor, all materials typically applied in solid oxide fuel and electrolysis cells. It is shown that how TEM and impedance spectroscopy can be synergically integrated to measure the transport and surface exchange properties of materials with nanoscale dimensions and to visualize their structural and elemental evolution via TEM/STEM imaging and spectroscopy.
Collapse
Affiliation(s)
- Zhongtao Ma
- DTU Energy, Fysikvej, Kongens Lyngby, 2800, Denmark
| | | | | | | | - Francesco Maria Chiabrera
- DTU Energy, Fysikvej, Kongens Lyngby, 2800, Denmark
- Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 2ª pl., Sant Adrià del Besòs Barcelona, 08930, Spain
| | | | - Christian Danvad Damsgaard
- DTU Nanolab, Ørsteds Plads, Kongens Lyngby, 2800, Denmark
- DTU Physics, Fysikvej, Kongens Lyngby, 2800, Denmark
| | | |
Collapse
|
5
|
Rørbech Ambjørner H, Bjørnlund AS, Bonczyk TG, Dollekamp E, Kaas LM, Colding-Fagerholt S, Mølhave KS, Damsgaard CD, Helveg S, Vesborg PCK. Thermal dynamics of few-layer-graphene seals. Nanoscale 2023; 15:16896-16903. [PMID: 37850513 DOI: 10.1039/d3nr03459c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2023]
Abstract
Being of atomic thickness, graphene is the thinnest imaginable membrane. While graphene's basal plane is highly impermeable at the molecular level, the impermeability is, in practice, compromised by leakage pathways located at the graphene-substrate interface. Here, we provide a kinetic analysis of such interface-mediated leakage by probing gas trapped in graphene-sealed SiO2 cavities versus time and temperature using electron energy loss spectroscopy. The results show that gas leakage exhibits an Arrhenius-type temperature dependency with apparent activation energies between 0.2 and 0.7 eV. Surprisingly, the interface leak rate can be improved by several orders of magnitude by thermal processing, which alters the kinetic parameters of the temperature dependency. The present study thus provides fundamental insight into the leakage mechanism while simultaneously demonstrating thermal processing as a generic approach for tightening graphene-based-seals with applications within chemistry and biology.
Collapse
Affiliation(s)
- Hjalte Rørbech Ambjørner
- Center for Visualizing Catalytic Processes (VISION), Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
| | - Anton Simon Bjørnlund
- Center for Visualizing Catalytic Processes (VISION), Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
| | - Tobias Georg Bonczyk
- Surface Physics and Catalysis (SURFCAT), Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
| | - Edwin Dollekamp
- Surface Physics and Catalysis (SURFCAT), Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
| | - Lau Morten Kaas
- Center for Visualizing Catalytic Processes (VISION), Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
| | - Sofie Colding-Fagerholt
- Center for Visualizing Catalytic Processes (VISION), Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
| | - Kristian Speranza Mølhave
- National Centre for Nano Fabrication and Characterization (Nanolab), Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
| | - Christian Danvad Damsgaard
- Center for Visualizing Catalytic Processes (VISION), Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
- Surface Physics and Catalysis (SURFCAT), Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
- National Centre for Nano Fabrication and Characterization (Nanolab), Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
| | - Stig Helveg
- Center for Visualizing Catalytic Processes (VISION), Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
| | - Peter Christian Kjærgaard Vesborg
- Center for Visualizing Catalytic Processes (VISION), Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
- Surface Physics and Catalysis (SURFCAT), Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
| |
Collapse
|
6
|
Ek M, Hansen LP, Chen FR, van Dyck D, Kisielowski C, Specht P, Damsgaard CD, Jinschek JR, Helveg S. Probing Catalyst Surfaces at the Atomic-scale. Microsc Microanal 2023; 29:1291. [PMID: 37613447 DOI: 10.1093/micmic/ozad067.660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/25/2023]
Affiliation(s)
- M Ek
- Topsoe A/S, Kgs. Lyngby, Denmark
- Centre for Analysis and Synthesis & NanoLund, Lund University, Lund, Sweden
| | | | - F R Chen
- Department of Materials Science and Engineering, City University of Hong Kong, Kowlook, Hong Kong
| | - D van Dyck
- Departments of Physics, EMAT, University of Antwerp, Antwerp, Belgium
| | - C Kisielowski
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley CA, United States
| | - P Specht
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley CA, United States
| | - C D Damsgaard
- National Center for Nano Fabrication and Characterization, Technical University of Denmark, Kgs. Lyngby, Denmark
- Center for Visualizing Catalytic Processes (VISION), Department of Physics, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - J R Jinschek
- National Center for Nano Fabrication and Characterization, Technical University of Denmark, Kgs. Lyngby, Denmark
- Center for Visualizing Catalytic Processes (VISION), Department of Physics, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - S Helveg
- Center for Visualizing Catalytic Processes (VISION), Department of Physics, Technical University of Denmark, Kgs. Lyngby, Denmark
| |
Collapse
|
7
|
Roy C, Knudsen BP, Pedersen CM, Velázquez-Palenzuela A, Christensen LH, Damsgaard CD, Stephens IEL, Chorkendorff I. Scalable Synthesis of Carbon-Supported Platinum–Lanthanide and −Rare-Earth Alloys for Oxygen Reduction. ACS Catal 2018. [DOI: 10.1021/acscatal.7b03972] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Claudie Roy
- Surface
Physics and Catalysis, Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
| | - Brian P. Knudsen
- Surface
Physics and Catalysis, Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
| | - Christoffer M. Pedersen
- Surface
Physics and Catalysis, Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
- Center
for Nano- and Micro technology, Danish Technological Institute (DTI), Gregersenvej, DK-2630 Taastrup, Denmark
| | - Amado Velázquez-Palenzuela
- Surface
Physics and Catalysis, Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
- Center
for Nano- and Micro technology, Danish Technological Institute (DTI), Gregersenvej, DK-2630 Taastrup, Denmark
| | - Leif H. Christensen
- Center
for Nano- and Micro technology, Danish Technological Institute (DTI), Gregersenvej, DK-2630 Taastrup, Denmark
| | - Christian Danvad Damsgaard
- Center
for Electron Nanoscopy, Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
| | - Ifan E. L. Stephens
- Surface
Physics and Catalysis, Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
- Department
of Materials, Imperial College London, London SW7 2AZ, United Kingdom
| | - Ib Chorkendorff
- Surface
Physics and Catalysis, Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
| |
Collapse
|
8
|
Chakraborty D, Damsgaard CD, Silva H, Conradsen C, Olsen JL, Carvalho HWP, Mutz B, Bligaard T, Hoffmann MJ, Grunwaldt JD, Studt F, Chorkendorff I. Bottom-Up Design of a Copper-Ruthenium Nanoparticulate Catalyst for Low-Temperature Ammonia Oxidation. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201703468] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Debasish Chakraborty
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
| | - Christian Danvad Damsgaard
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
- Center for Electron Nanoscopy; Technical University of Denmark; Fysikvej, Building 307 2800 Kgs. Lyngby Denmark
| | - Hugo Silva
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
| | - Christian Conradsen
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
| | - Jakob Lind Olsen
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
| | - Hudson W. P. Carvalho
- Centro de Energia Nuclear na Agricultura; Universidade de S. Paulo; P.O. Box 96 13400-970 Piracicaba SP Brazil
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT); Engesserstr. 20 76131 Karlsruhe Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT); Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Benjamin Mutz
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT); Engesserstr. 20 76131 Karlsruhe Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT); Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | | | | | - Jan-Dierk Grunwaldt
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT); Engesserstr. 20 76131 Karlsruhe Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT); Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Felix Studt
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT); Engesserstr. 20 76131 Karlsruhe Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT); Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Ib Chorkendorff
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
| |
Collapse
|
9
|
Chakraborty D, Damsgaard CD, Silva H, Conradsen C, Olsen JL, Carvalho HWP, Mutz B, Bligaard T, Hoffmann MJ, Grunwaldt JD, Studt F, Chorkendorff I. Bottom-Up Design of a Copper-Ruthenium Nanoparticulate Catalyst for Low-Temperature Ammonia Oxidation. Angew Chem Int Ed Engl 2017; 56:8711-8715. [DOI: 10.1002/anie.201703468] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Debasish Chakraborty
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
| | - Christian Danvad Damsgaard
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
- Center for Electron Nanoscopy; Technical University of Denmark; Fysikvej, Building 307 2800 Kgs. Lyngby Denmark
| | - Hugo Silva
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
| | - Christian Conradsen
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
| | - Jakob Lind Olsen
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
| | - Hudson W. P. Carvalho
- Centro de Energia Nuclear na Agricultura; Universidade de S. Paulo; P.O. Box 96 13400-970 Piracicaba SP Brazil
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT); Engesserstr. 20 76131 Karlsruhe Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT); Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Benjamin Mutz
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT); Engesserstr. 20 76131 Karlsruhe Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT); Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | | | | | - Jan-Dierk Grunwaldt
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT); Engesserstr. 20 76131 Karlsruhe Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT); Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Felix Studt
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT); Engesserstr. 20 76131 Karlsruhe Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT); Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Ib Chorkendorff
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
| |
Collapse
|
10
|
Damsgaard CD, Duchstein LDL, Sharafutdinov I, Nielsen MG, Chorkendorff I, Wagner JB. In situETEM synthesis of NiGa alloy nanoparticles from nitrate salt solution. Microscopy (Oxf) 2014; 63:397-401. [DOI: 10.1093/jmicro/dfu025] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
11
|
Dalslet BT, Damsgaard CD, Donolato M, Strømme M, Strömberg M, Svedlindh P, Hansen MF. Bead magnetorelaxometry with an on-chip magnetoresistive sensor. Lab Chip 2011; 11:296-302. [PMID: 20978654 DOI: 10.1039/c0lc00002g] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Magnetorelaxometry measurements on suspensions of magnetic beads are demonstrated using a planar Hall effect sensor chip embedded in a microfluidic system. The alternating magnetic field used for magnetizing the beads is provided by the sensor bias current and the complex magnetic susceptibility spectra are recorded as the 2nd harmonic of the sensor response. The complex magnetic susceptibility signal appears when a magnetic bead suspension is injected, it scales with the bead concentration, and it follows the Cole-Cole expression for Brownian relaxation. The complex magnetic susceptibility signal resembles that from conventional magnetorelaxometry done on the same samples apart from an offset in Brownian relaxation frequency. The time dependence of the signal can be rationalized as originating from sedimented beads.
Collapse
Affiliation(s)
- Bjarke Thomas Dalslet
- Department of Micro- and Nanotechnology, Technical University of Denmark, DTU Nanotech, Building 345 East, 2800, Kgs. Lyngby, Denmark
| | | | | | | | | | | | | |
Collapse
|