Polymer-Elektrolyt Brennstoffzellen; PEFC; Elektrokatalyse; Sauerstoffreduktion; Nanostruktur; Aerogel
Henning Sebastian, Shimizu Ryo, Herranz Juan, Kühn Laura, Eychmüller Alexander, Uchida Makoto, Kakinuma Katsuyoshi, Schmidt Thomas J. (2018), Unsupported Pt 3 Ni Aerogels as Corrosion Resistant PEFC Anode Catalysts under Gross Fuel Starvation Conditions, in Journal of The Electrochemical Society
, 165(6), F3001-F3006.
Ishikawa Hiroshi, Henning Sebastian, Herranz Juan, Eychmüller Alexander, Uchida Makoto, Schmidt Thomas J. (2018), Tomographic Analysis and Modeling of Polymer Electrolyte Fuel Cell Unsupported Catalyst Layers, in Journal of The Electrochemical Society
, 165(2), F7-F16.
Cai Bin, Henning Sebastian, Herranz Juan, Schmidt Thomas J., Eychmüller Alexander (2017), Nanostructuring Noble Metals as Unsupported Electrocatalysts for Polymer Electrolyte Fuel Cells, in Advanced Energy Materials
, 7(23), 1700548-1700548.
Henning Sebastian, Ishikawa Hiroshi, Kühn Laura, Herranz Juan, Müller Elisabeth, Eychmüller Alexander, Schmidt Thomas J. (2017), Unsupported Pt-Ni Aerogels with Enhanced High Current Performance and Durability in Fuel Cell Cathodes, in Angewandte Chemie International Edition
, 56(36), 10707-10710.
Henning Sebastian, Herranz Juan, Ishikawa Hiroshi, Kim Bae Jung, Abbott Daniel, Kühn Laura, Eychmüller Alexander, Schmidt Thomas J. (2017), Durability of Unsupported Pt-Ni Aerogels in PEFC Cathodes, in Journal of The Electrochemical Society
, 164(12), F1136-F1141.
Henning Sebastian, Kühn Laura, Herranz Juan, Nachtegaal Maarten, Hübner René, Werheid Matthias, Eychmüller Alexander, Schmidt Thomas J. (2017), Effect of Acid Washing on the Oxygen Reduction Reaction Activity of Pt-Cu Aerogel Catalysts, in Electrochimica Acta
, 233, 210-217.
Henning Sebastian, Kühn Laura, Herranz Juan, Durst Julien, Binninger Tobias, Nachtegaal Maarten, Werheid Matthias, Liu Wei, Adam Marion, Kaskel Stefan, Eychmüller Alexander, Schmidt Thomas J. (2016), Pt-Ni Aerogels as Unsupported Electrocatalysts for the Oxygen Reduction Reaction, in Journal of The Electrochemical Society
, 163(9), F998-F1003.
Polymer electrolyte fuel cells (PEFCs) converting hydrogen and oxygen into electricity are promising devices for clean and efficient energy conversion in mobile and stationary applications. However, one of the biggest challenges on the material level is the sluggish reaction kinetics for the reduction of molecular oxygen on the fuel cell cathode side. This sluggish kinetics is responsible for the main voltage and efficiency losses inside a PEFC and calls for typically quite high loadings of the used Pt-based electrode catalysts, which in turn affects the fuel cell cost in a negative way. In addition, the normally carbon supported Pt catalysts are known to exhibit some instabilities under transient high-voltage conditions due to corrosion of the carbon supports. Therefore, the goals of the project is to design advanced unique multi-metallic aerogel electrocatalysts showing superior catalytic performance for the oxygen reduction reaction (ORR) and high long-term durability under operating fuel cell conditions as compared to the state-of-the-art systems. Therefore, knowledge has to be gained about the relationships between structure, composition, shape and reactivity is necessary to achieve this goal. The following objectives are to be addressed in this work: (i) To design and fabricate new unsupported metallic aerogels consisting of bimetallic Pt-NPM (NPM=non-precious metal such as Ni, Co, Cu and Fe) nanoparticles connected in a long-range 3D network structure; (ii) To determine the structure-composition-shape-reactivity relationships of Pt alloy aerogels for the electrochemical ORR; and (iii) To study the long-term durability and chemical stability under strongly corrosive conditions.