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Solid oxide fuel cells offer great prospects for the sustainable, clean and safe conversion of various fuels into electrical energy. In this thesis, the performance-determining loss processes for the cell operation on reformate fuels are elucidated via electrochemical impedance spectroscopy. Model-based analyses reveal the electrochemical fuel oxidation mechanism, the coupling of fuel gas transport and reforming chemistry and the impact of fuel impurities on the degradation of each loss process.

SOFC --- Electrochemistry --- Reforming Chemistry --- Impedance Spectroscopy --- Modeling

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Solid oxide fuel cells (SOFC) achieve high efficiencies, the lower the internal electrochemical losses are. This work investigates insulating secondary phases at the cathode/electrolyte interface that are formed during fabrication. Full cells and model systems are electrochemically characterized, analyzed by electron microscopy and reconstructed by tomography. A FEM model reveals performance limiting factors. As a result, an optimized production routine is proposed.

Hochtemperatur-Brennstoffzelle (SOFC), Zweitphasenidentifikation, elektrochemische Impedanzspektroskopie, korrelative Tomographie, FEM-Modellierung, solid oxide fuel cell (SOFC), secondary phase identification, electrochemical impedance spectroscopy, correlative tomography, FEM modeling

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In dieser Arbeit wurde der Effekt des metallischen Interkonnektors (MIC) auf die Leistungsdichte der anodengestützten Zelle (ASC) sowie die Wechselwirkung zwischen dem MIC und der Kathode (Cr-Vergiftung) untersucht. Durch die Separation der Elektrodenverluste wurden drei von der Geometrie verursachte Verluste identifiziert und quantifiziert. Weiter konnte gezeigt werden, dass in Anwesenheit des MIC eine starke Degradation der Zellleistung durch Cr-Vergiftung der Kathoden-Elektrochemie stattfand.

Cr-Vergiftungmetallischer Interkonnektor (MIC)anodengestützte Zelle (ASC)Hochtemperatur Brennstoffzelle (SOFC)APU Stack

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Due to their high energy conversion efficiencies and low emissions, Solid Oxide Fuel Cells (SOFCs) show promise as a replacement for combustion-based electrical generators at all sizes. Further increase of SOFC efficiency can be achieved by microstructural optimization of the oxygen-ion conducting electrolyte and the mixed ionic-electronic conducting cathode. By application of nanoscaled thin films, the exceptionally high efficiency allows the realization of mobile SOFCs.

solid oxide fuel cell (SOFC), cathode, electrolyte, nanoscaled thin film, grain-size effect

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Advanced Glasses, Composites and Ceramics for High-Growth Industries (CoACH) was a European Training Network (ETN) project (http://www.coach-etn.eu/) funded by the Horizon 2020 program. CoACH involved multiple actors in the innovation ecosystem for advanced materials, composed of five universities and ten enterprises in seven different European countries. The project studied the next generation of materials that could bring innovation in the healthcare, construction, and energy sectors, among others, from new bioactive glasses for bone implants to eco-friendly cements and new environmentally friendly thermoelectrics for energy conversion. The novel materials developed in the CoACH project pave the way for innovative products, improved cost competitiveness, and positive environmental impact. The present Special Issue contains 14 papers resulting from the CoACH project, showcasing the breadth of materials and processes developed during the project.

graphitization --- wood-derived biocarbon --- thermal conductivity --- Thermoelectrics --- GeTe --- Al-doping --- Ba-doping --- loss of band convergence --- lowered zT --- geopolymer composite --- wastes incorporation --- cellulose fibers --- cellulose modification --- solid-liquid interdiffusion (SLID) bonding --- transient-liquid phase bonding (TLPB) --- skutterudite --- high-temperature thermoelectric material --- joining --- glass recycling --- alkali activation --- gel casting --- glass foams --- phosphate glass --- oxyfluoride phosphate glass --- Er2O3-doped particles --- direct particle doping --- Er3+ luminescence property --- glass–ceramic --- shear strength --- elastic modulus --- SOFC --- SOEC --- SOC --- mechanical strength --- flexural biaxial test --- ball-on-3-balls test --- fractography --- residual stresses --- evanescent wave optical fiber sensors --- diffusion --- glass fiber-reinforced polymers --- testing and aging --- Zinc --- silver-doped mesoporous glass --- chitosan --- PCL --- Vicryl Plus suture --- dip coating --- polydopamine --- silver --- antibacterial --- biocompatibility --- bioactive glass-ceramic --- coatings --- Thermoelectrics --- oxidation resistance --- hybrid-coating --- alkali activation --- inorganic gel casting --- glass–ceramic foams --- waste glass --- fly ash --- PMCs --- GFRPs --- seawater exposure --- diffusion --- ageing --- accelerated testing --- gravimetric --- DMA