The book "Design of a Small Scale Reactor for Studying Ni-YSZ" by Veronica Echeverria provides a comprehensive investigation into biomass gasification and its integration into solid oxide fuel cells (SOFCs). It explains how syngas produced from biomass gasification can be used in SOFCs to efficiently convert chemical energy into electrical energy. A central theme of the book is the issue of biogenic contaminants, particularly tars that are generated during the gasification process. These tars can impair the performance of the fuel cells by blocking the reaction sites on the anode material Ni-YSZ. The book examines the maximum tolerance to tar content in syngas and offers valuable insights for improving the performance of SOFCs through the in situ reforming of tars. This research is crucial for the development of sustainable energy technologies and the optimization of biomass gasification systems.