Electrocatalysis allows for storing electricity or converting it into chemical bonds, producing chemical building blocks and fuels using renewable resources.

Sustainable energy from wind and solar is most readily available near the sea.

My work focuses on a class of astronomical objects called protoplanetary disks.

This thesis focuses on protoplanetary disks: flattened structures of gas and dust around young stars in which planets are expected to form and grow.

Promotores: Prof.dr. A.G.G.M. Tielens, Prof.dr. L.B.F.M. Waters (UvA), Prof.dr. C. Dominik (UvA)

A large diversity of exoplanetary systems has been found, but it is still unclear what drives this diversity.

The work presented in this thesis is based on ALMA surveys of protoplanetary disks in three star-forming regions: Lupus, OMC-2, and NGC 2024.

Promotores: H.W. Lenstra, K. Belabas (University of Bordeaux)

To address the fundamental questions of how life on Earth emerged and how common life may be in the Universe, it is crucial to know the chemical composition of the planet-forming material.

Planets are formed in disks of gas and dust around young stars.

Promotor: Prof.dr. E.F. van Dishoeck

This thesis examines the link between simple molecules and the underlying structure and chemistry within protoplanetary disks - the birthplaces of planets.

Promotores: Prof.dr. E.F. van Dishoeck, Prof.dr. C.P. Dullemond

Promotor: Prof.dr. P. Stevenhagen

Promotores: Prof.dr. H Lenstra, Prof.dr. A Facchini (Padova University)

Understanding the formation and evolution of planetary systems is one of the most fundamental challenges in astronomy. To directly image and study young exoplanets and the circumstellar disks they form from, dedicated high-contrast imaging instruments are built.

The focus of this thesis is how stars like our Sun and planets like Jupiter, Saturn, and Earth are formed.

This thesis takes steps toward understanding the interaction between gas-phase and solid-state molecules in star- and planet-forming regions.

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.

Tin electrodeposition applications have rapidly evolved in the past 25 years.

Does the presence of Ring-necked parakeets negatively influence feeding and feeding behaviour of native bird species on artificial bird feeders and if so, what are possible solutions?

In this thesis we have discussed several parameters that affect the electrochemical conversion of enviromentaly harmful molecules such as nitrates and carbon dioxide to more valuable and less deleterious compounds, in order to cast light onto the mechanism of the reaction to achieve an efficient and…

We have conducted a full spectral line survey of the 3-13 micron region of two massive protostars, AFGL 2591 and AFGL 2136, for the first time at high spectral resolution.

When a star gets too close to a supermassive black hole, it is torn apart by strong tidal forces in a tidal disruption event (TDE).

Saturnus staat bekend om zijn ringen. Uit recente data van de ruimtesonde Cassini blijkt nu echter dat de planeet deze iconische ringen niet altijd heeft gehad. Leidse astronomen Yamila Miguel en Matthey Kenworthy reageren in verschillende media op de ontdekking.

This thesis discusses the physical and chemical processes than influence the composition of forming planets.

Multiple stars, that is two or more stars composing a gravitationally bound system, are common in the universe.

Jonge sterrenstelsels zijn minder rommelig dan verwacht en blijken ook al spiraalarmen, balken en ringen te bevatten. Dat stelt een internationaal team van onderzoekers onder leiding van assistant professor Jacqueline Hodge. De jonge, ver van ons vandaan staande sterrenstelsels waren tot nu toe wazige…

Sterrenkundigen uit onder andere Leiden hebben in Zuid-Afrika de eerste astronomische opnamen gemaakt met de door hen gebouwde bRing-camera. Deze camera zal een jaar lang gericht staan op de planeet die rond de ster Beta Pictoris draait, om te kijken of deze planeet een ringenstelsel heeft.

Promotor: Prof.dr. D. Bouwmeester, Co-Promotor: M.J.A. de Dood

Cathodic corrosion is a relatively unknown phenomenon that can severely etch metallic electrodes at cathodic (negative) potentials.

We investigate the buildup of galaxies from various vantage points. The first two chapters focus on the stellar content of galaxies, especially the distribution of stellar masses at birth and potential variations therein in various galactic environments.

In this thesis, we present new laboratory data of interstellar dust analogues.

An objective of this research was to achieve direct, well-defined and non-rate-limiting electron transfer between respiratory enzymes and the electrode surface by means of 'Q-wires'.

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This dissertation focused on computational methods based on first principles calculations using the Density Functional Theory (DFT) framework. Emphasis was laid on affordable methods that can provide a tradeoff between computational expense and accuracy.

Assuming everywhere good reduction we generalize the class number formula of Taelman to Drinfeld modules over arbitrary coefficient rings.

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This dissertation consists of two parts, with the common theme

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Promotores: B. Erez, P. Stevenhagen, Co-Promotor: B. de Smit

Promotor: M.T.M. Koper, Co-promotor: L. Juurlink

This thesis focuses on the synthesis, characterization and performance towards CO2 electroreduction of mono and bi-metallic particles based on p-block metals

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Wiskunde en Natuurwetenschappen, Leids Instituut voor Chemisch Onderzoek (LIC)

Promotores: H. Schiessel, G.T. Barkema