Books

Spectral Deferred Correction (SDC) is a method for numerically integrating initial value problems. The method iteratively generates solutions to fully implicit Runge-Kutta methods with forward substitution using low order solves. [...]

All-solid-state lithium batteries (ASSBs) are considered a promising future battery technology due to their high safety and energy density. However, they are suffering from mechanical fatigue during cycling, caused by induced mechanical stresses by volume changes in the electrode active materials which is constrained by the solid electrolyte. [...]

Cost-Optimal Energy Deficits in Renewable Energy Systems. Fossil energies threaten human prosperity through environmental pollution, which is why renewable energies are needed as a sustainable alternative. [...]

Soil moisture is a key variable in the water and energy cycles at the atmosphere-land-vegetation interface. Accurate and continuous soil moisture data are essential for many applications, including water resources management, drought monitoring, and agricultural forecasting. [...]

Large-scale atomistic simulations rely on interatomic potentials providing an efficient representation of atomic energies and forces. Modern machine-learning (ML) potentials provide the most precise representation compared to electronic structure calculations while traditional empirical potentials provide a less precise, but computationally much faster representation and, thus, allow simulations of larger systems. [...]

As the world seeks cleaner and more efficient energy solutions, solar power has emerged as a key renewable option. Among the various technologies, III-V multi-junction solar cells absorb an extended range of the solar spectrum and thus achieve the highest conversion efficiencies in photovoltaics today. [...]

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. [...]

The electrochemical reduction of carbon dioxide, ECR, fueled by renewable energy sources, holds promise for addressing escalating greenhouse emissions and closing the carbon cycle. This thesis focuses on developing cost-effective catalysts to facilitate the electrochemical conversion of CO2 to CO. [...]