69 search results for “platinum” in the Public website
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Platinum electrochemistry through a magnifying glass
In most applications, electrocatalysts exhibit a large surface area to volume ratio, for example using nanoparticles.
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Water related adsorbates on stepped platinum surfaces
Promotor: M.T.M. Koper, Co-Promotor: L.B.F. Juurlink
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PhD in physical chemistry: operando spectroscopy on platinum electrocatalysts
Science, Leiden Institute of Chemistry (LIC)
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Surface-structure dependence of water-related adsorbates on platinum
Promotor: M.T.M. Koper, Co-promotor: J.B.F. Juurlink
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Mechanism captured behind platinum catalyst
Cars are equipped with catalysts to disarm toxic exhaust gases. Platinum plays an important role there. Leiden physicists and chemists have now for the first time seen the mechanism behind a platinum catalyst. With a fundamental understanding of the process, scientists can use this rare material more…
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Observing a changing platinum electrode
The surface of platinum electrodes changes much more during use than was previously thought. In a collaboration between the Leiden Institutes of Chemistry and Physics, chemists Leon Jacobse, Yi-Fan Huang and Marc Koper, and physicist Marcel Rost have been able to show this for the first time. Publication…
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The roughening of a platinum electrode
Smooth platinum electrodes roughen and wear when subjected to repeated cycles of oxidation and reduction, which causes nanometer-scale mounds to grow. Leiden chemists Leon Jacobse and Marc Koper, together with physicist Marcel Rost, discovered the exact details, using a unique tunneling microscope.
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Conversion of renewable raw materials on platinum shows unexpected behaviour
The electrochemical reduction of a group of organic compounds on platinum is strongly dependent on the arrangement of the atoms in the platinum surface. Christoph Bondue, postdoc in Marc Koper's group, published this in Nature Catalysis on 4 March. The reduction of such compounds is an important process…
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We finally understand how oxygen reacts on platinum
Platinum is a widely used catalyst, but its precise mechanism largely remains a mystery to scientists. Ludo Juurlink has now demonstrated for the first time how oxygen reacts on the platinum surface. Together with PhD students Kun Cao and Richard van Lent and international colleagues he publishes his…
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TOP subsidy for research into sustainable platinum electrodes
Leiden research into the properties of platinum receives a TOP subsidy of 780.000 euros from the The Netherlands Organisation for Scientific Research NWO. Aim of the project is a more efficient and sustainable use of the rare metal.
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Richard van Lent
Science
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Steps in gas-surface reactions
Heterogeneous catalysis is essential to many industrial applications. These catalysts are often comprised of supported nanoparticles, which contain various different surface sites.
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Electrolysis and fuel production
Electrolysis is a technique that can be used to convert CO2 into fuels and other useful products. To do this efficiently and on a large scale, however, we need to understand exactly how electrolysis works. Professor Marc Koper is an expert in this field.
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Oxidation catalysis on Pt and Au: complexity of simple chemistry
Promotor: J.W.M. Frenken Co-Promotores: I.M.N. Groot; L.B.F. Juurlink
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PhD Theses
A full overview of MCBIM PhD theses.
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Water related adsorbates on stepped platinum surfaces
PhD Defence
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Platinum electrochemistry through a magnifying glass
PhD Defence
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Cathodic corrosion
Cathodic corrosion is a relatively unknown phenomenon that can severely etch metallic electrodes at cathodic (negative) potentials.
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PhD Theses
A full overview of CASC PhD theses.
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Solvent effects in the electrocatalytic reactions of water
Koper
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Rik Mom receives an NWO Tenure Track and returns to Leiden
Through an NWO grant, chemist Rik Mom has received a tenure track position at the Leiden Institute of Chemistry, where he obtained his PhD cum laude in 2017. Mom will study the storage of sustainable energy by means of splitting water. Using new methods, he will investigate on an atomic scale which…
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Adsorption and catalysis on Pt and Pd monolayer-modified Pt single crystal electrodes
The focus throughout this thesis will be on gathering fundamental studies of the detailed structure and composition of the electrode/electrolyte interface effect on the rate and mechanism of key electrocatalytic reactions.
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Stefania Ketzetzi
Microscopic spheres that can self-propel through a liquid move faster over a hydrophobic surface than they do over a hydrophilic surface. ‘This was a surprise,’ says Stefania Ketzetzi, the researcher who discovered the effect. Understanding how these artificial spheres move is important for understanding…
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The role of water in hydrogen electrocatalysis
Promotor: M.T.M. Koper, Co-promotor: L. Juurlink
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Reedijk Symposium 2019: Platinum electrodes: not as noble as you think
Lecture
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Chemists solve persistent problem after four decades
After almost four decades, Leiden and Eindhoven chemists have resolved the discussion about the correct model for the simplest chemical reaction in heterogeneous catalysis, which is essential for fuel cells. Using a unique curved platinum surface, Ludo Juurlink and PhD candidate Richard van Lent from…
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Interaction of oxygen and carbon monoxide with Pt(111) at intermediate pressure and temperature: revisiting the fruit fly of surface science
Promotor: M.T.M. Koper, Co-promotors: A.I. Yanson, L.B.F. Juurlink
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Electrocatalysis for sustainable energy
Marc Koper’s research focuses on electrocatalysis and electrochemical surface science for sustainable energy and chemistry. Reactions of interest are the redox reactions of the oxygen/hydrogen cycle (water oxidation, hydrogen evolution), the carbon cycle (reduction of carbon dioxide, oxidation of small…
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Surface-structure dependence of water-related absorbates on platinum
PhD Defence
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Two cum laude distinctions for storing renewable energy
Both Leon Jacobse and Thom Hersbach from Marc Koper's research group obtained their PhDs cum laude. They both investigated changes on the surface of a platinum electrode. Jacobse studied this at a positive voltage, Hersbach at a negative voltage. Platinum has the potential to convert renewable energy…
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Semi-empirical approach to the simulation of molecule-surface reaction dynamcis
Catalysis is of extreme relevance in the production of everyday materials and plays a central role in many aspects of our life.
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Three discoveries for cleaner and cheaper fuel
How can rare and expensive materials be used more efficiently to produce cleaner and cheaper fuel? Under the guidance of Marc Koper, Professor of Catalysis and Surface Chemistry, international teams of scientists have published 3 articles in Nature Communications.
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New research shows the limitations of coordination in chemistry
A common assumption in chemistry is that the coordination number of a catalyst's surface determines the reactivity of the reaction it catalyses. Strikingly, Leiden chemists have now proven that this is not true for nature’s most simple chemical reaction: the dissociation of hydrogen. The researchers…
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Cathodic corrosion: devastating but predictable
An indian stepwell on a nanoscale. That is what postdoc Nakkiran Arulmozhi calls the pattern he saw when he corroded a special kind of platinum crystal. The unique images show the destructiveness of the process, but also show how predictable it is.
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Converting water into hydrogen more efficiently
Scientists have long been puzzled why it is easier to produce hydrogen from water in an acidic environment than in an alkaline environment. Marc Koper comes with an explanation: the reason is the electric field at the surface of the catalyst, which is larger in an alkaline environment, as he writes…
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Leiden University Excellence Scholarships (LexS) awarded
The Leiden University Excellence Scholarships Programme (LExS) provides scholarships for excellent international students from outside the EU/EEA who come to Leiden to follow a master’s programme. The first eighty LExS scholarships have been awarded for this academic year.
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New insight brings sustainable hydrogen one step closer
Leiden chemists Marc Koper and Ian McCrum have discovered that the degree to which a metal binds to the oxygen atom of water is decisive for how well the chemical conversion of water to molecular hydrogen takes place. This insight helps to develop better catalysts for the production of sustainable hydrogen,…
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International attention for solution long-standing scientific problem
Solving a scientific problem after decades: it’s a long-lasting dream for many scientists. Consequently, the research of Leiden and Eindhoven chemists gained a lot of media attention, for instance from the Belgian news website VRT Nieuws and science website Phys.org.
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Monitoring and detection of nanomaterials in biological media.
How do nanoparticles bioaccumulate and biodistribute in organisms?
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Solution for Critical Raw Materials - an European Export Network (SCRREEN)
Where and how are critical materials currently used and how can this information be used to develop scenarios about their future demand.
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Tanja Masson: who owns the moon?
The moon exerts a pull on us. The Americans won the space race and were first to land there. In the Universiteit van Nederland, space law expert Tanja Masson explores the questions that this raises. Who owns the moon and the valuable resources that are found there?
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Rachel Doherty wins LION Image Award with famed Microboat image
The annual LION Image award goes to the 30 micrometer long 3D printed microboat image that went viral earlier in October 2020, submitted by Rachel Doherty of the Daniela Kraft lab.
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Operando research in heterogeneous catalysis
The nanoscale structure of a catalyst under reaction conditions determines its activity, selectivity, and stability. For the production of sustainable energy and materials, new catalysts are needed. By understanding the structure-activity relationships of catalysts under reaction conditions, insight…
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Dick Stufkens Prijs 2019 awarded to electrochemist Thom Hersbach
The Dick Stufkens Prize 2019 for the best PhD thesis of the Holland Research School of Molecular Chemistry (HRSMC) will be awarded to Thom Hersbach. In his thesis, Hersbach presents a thorough analysis of cathodic corrosion. His comprehensive research, on which he graduated with the distinction cum…
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Faculty of Science kicks off academic year sustainably with electrocatalysis and a surprise
In a full lecture hall C1 the Faculty of Science started off the new academic year on Tuesday 5 September. The theme of the meeting was, just as it had been at the university's opening the day before, sustainability.
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Microswimmers swim faster over slippery surfaces
Tiny self-propelling spheres, measuring only micrometers, move faster over a hydrophobic silicone surface than they do over hydrophilic glass. 'Almost nobody had realised that the substrate matters', says Stefania Ketzetzi, the researcher who discovered the effect, researched it and explained it. She…
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The superpowers of new critical raw materials
Cars, wind turbines, solar panels and smartphones. ‘Critical’ raw materials like platinum or cobalt are used in all the technologies that are essential for the energy and digital transition. But we should be aware of the scarceness of these materials, a new campaign warns.
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LION Image Awards
On 15 January, the winner of the famed LION Image Award will be announced. Submissions ranged from the famous 3d printed microboat to an eerily abstract graph depicting a Majorana fermion.
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Vidi research grant for physicist Daniela Kraft
The image of the Leiden microboat traveled all over the world, from the BBC up to Arab shipping blogs. But Daniela Kraft's research group has quite a few more different 3D printed microswimmers up their sleeves. Kraft receives a Vidi research grant for research into these variously shaped active par…
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Understanding hydrogen electrocatalysis
Electrocatalysis will play an increasingly important role in future in the transition to more sustainable energy. Thanks to chemist Isis Ledezma Yanez, we now know more about the hydrogen evolution process. PhD defence on the 9th of June.