Andreas Nenning

Solid oxide fuel - and electrolysis cells enable highly efficient and reversible energy conversion. Current-generation SOFCs operate at temperatures above 800°C, which leads to accelerated aging effects and high construction costs. Much research effort is attributed to reduce the operating temperature of these cells, which implies the usage of new materials with higher catalytic activity at lower temperature.

In his thesis, Andreas investigates the fundamental properties of ceramic materials with electronic and ionic conduction. Such materials are potential candidates for next-generation SOFC anode materials. By using impedance spectroscopy and x-ray photoelectron spectroscopy, the factors governing the oxygen exchange between oxide and atmosphere can be correlated to the chemical fingerprint of the material's surface. The goal of his thesis is a better understanding of the factors that are crucial for a highly active anode in order to enable a more targeted search for new materials.