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Membrane electrode assemblies (MEA) developed at the Westphalian Energy Institute for polymer electrolyte membrane fuel cells (PEMFC) are high tech systems containing various materials structured in nanoscale, at which electrochemical reactions occur on catalyst nano particle surfaces. For low reactance homogeneous compression of the MEA’s layers is necessary. A novel stack architecture for electrochemical cells, especially PEMFC as well as PEM electrolysers, has been developed according to achieve ideal cell operation conditions. Single cells of such a stack are inserted into flexible slots that are surrounded by hydraulic media. While operation the hydraulic media is pressurised which leads to an even compression and cooling of the stack’s cells. With this stack design it has been possible to construct a test facility for simultaneous characterisation of several MEA samples. As compression and temperature conditions of every single sample are equal, with the novel test system the effect of e.g. different electrode configurations can be investigated. Furthermore, the modular stack design leads to the development of hybrid energy applications combining fuel cells, electrolysers, batteries as well as metal hydride tanks in one system.
Crowdfunding im Journalismus
(2014)
Diversity nachhaltig erfolgreich zu gestalten ist das Ziel zahlreicher AkteurInnen in Unternehmen, Bildungseinrichtungen und der Politik. Doch gerade die Vielfalt der Ansätze bringt oft Verwirrung.
ExpertInnen aus Wissenschaft und Praxis bieten in diesem Buch innovative Antworten auf das Verhältnis zwischen Corporate Social Responsibility und Diversity, einem Feld dessen Potentiale bisher noch wenig genutzt wurden. Praktische Erfahrungen aus Unternehmen, Hochschulen, Verbänden und der Beratung ergänzen theoretische Konzepte und zeigen erfolgreiche Umsetzungskonzepte auf, mit denen Synergien genutzt werden konnten. Dieser Band zeigt, wie CSR und Diversity zu nachhaltigem Erfolg führen kann und eröffnet eine neue Diskussion in Wissenschaft und Praxis.
The membrane electrode assemblies (MEA) for polymer electrolyte membrane fuel cells (PEMFC) developed at the Westphalian Energy Institute are based on oxygen plasma activated carbon nanotubes (CNT) doped with platinum particles. For electrode preparation an ink is used containing the activated CNTs as well as hydrophobic and hydrophilic material in solved form. After this ink is sprayed onto a graphitic substrate platinum particles are deposited by pulse plating method, where the plasma activation enhances CNT dispersibility as well as platinum deposition. This materials mixture is structured in nanoscale with the aim to increase the catalyst particles’ specific surface. For low reactance at operation, homogeneous compression of the MEA’s layers is necessary within a PEMFC. A novel stack architecture for electrochemical cells, especially PEMFC as well as PEM electrolysers, has been developed in order to achieve ideal cell operation conditions. Single cells of such a stack are inserted into flexible slots that are surrounded by a hydraulic medium which is pressurised during operation in order to achieve an even compression and cooling of the stack’s cells. With this stack design it has been possible to construct a test facility for simultaneous characterisation of several MEA samples. As compression and temperature conditions of every single sample are the same, the effects of e.g. different electrode configurations can be investigated with the novel test system.