Intro; Abstract; Kurzfassung; Content; List of Acronyms and Abbreviations; 1. Introduction; 2. Theoretical Concepts and Experimental Methods; 3. Platinum-Free Oxygen Reduction Electrocatalysis; 4. PEMFC Degradation by Start-Up/Shut-Down; 5. Conclusions; References; List of Figures; Acknowledgements; Curriculum Vitae; List of Publications.