Doktorarbeiten

Proton-conducting electrolysis cells (PCECs) are critical to sustainable energy technologies, as they enable the production of undiluted hydrogen that can be readily compressed and stored. These cells are essential for establishing a hydrogen economy. [...]

Recently, a novel solid oxide cell was developed for the production of green hydrogen via water electrolysis and electricity from hydrogen respectively. The cell is fuel electrode supported and utilizes a Ni-CGO composite as fuel electrode instead of Ni-YSZ as used in state-of-the-art cells. [...]

As a new class of quantum matter, topological insulators (TIs) have attracted significant attention in the field of condensed matter physics due to their exotic intrinsic physical properties. TIs, which exhibits either two-dimensional (2D) or three-dimensional (3D) topology, are materials that are insulating in the bulk and conducting at the edge or surface. [...]

Im Kampf gegen die Klimakrise ist der Aufbau treibhausgasneutraler Energie- und Wirtschaftssysteme von zentraler Bedeutung. Fluktuierende erneuerbare Energien, Sektorkopplung und steigender Speicherbedarf führen zu einer erheblichen Zunahme der Systemkomplexität zukünftiger Energiesysteme. [...]

This thesis deals with the 2D material graphene, which has been the subject of intense research in recent years due to its unique properties. The main focus is on different ways to tune the properties of graphene. [...]

Plant root systems are essential for global food security. Their growth, however, is governed by a complex interplay of soil's physical, biological, and chemical properties and is critically limited by soil compaction. [...]

his dissertation explores the role of dynamic functional connectivity (dFC) as an intermediate phenotype linking neurobiological characteristics and clinical outcomes in psychotic and affective disorders. The thesis aims to reveal alterations in dFC in psychotic and affective patients, study the impact of neurobiology on static and dynamic FC patterns, and identify neurobiological processes which might contribute to static and dynamic FC changes in psychotic and affective disorder. [...]

In an environment as complex and unpredictable as our human society, we cannot merely rely on hard-wired reflexes and short-term incentives for successful behavior. Instead, our brain uses cognitive control to derive expectations from current and prior information and adapts strategically to changing demands. [...]

The functional organization of the human brain is based on neuronal connections (edges) between cortical regions (nodes), known as structural connectivity. This may become disrupted by tumor growth or multimodal treatments, leading to cognitive impairment. [...]