Durable polymers functionalized with acidic or basic groups are currently developed for proton- or anion-exchange membrane (PEM or AEM) fuel cells, respectively. The properties of perfluorosulfinic acid PEMs restrict the conditions under which these fuel cells can be operated because of limitations conductivity and stability. We are presently pursuing different approaches to alternative membranes where sulfonic acid groups are concentrated to selected aromatic segments in the polymeric structure to induce a higher level of organization of the conducting phase domains in the PEM. This includes for example the preparation of various highly stable hydrophilic-hydrophobic multiblock copolymers with blocks having very high acid contents. This leads to excellent performance and high proton conductivity at low relative humidity. AEM fuel cells hold the promise of platinum free catalysis, but present critical challenges in terms of membrane conductivity and stability. Here, we are preparing and studying various aromatic AEMs which contain very high local concentrations of ammonium moieties for high anionic conductivity and enhanced durability. Macromolecular design principles, synthetic procedures and important structure-property relationships of these new materials will be discussed.
|Title of host publication||Proceedings of CIMTEC 2014|
|Publisher||Trans Tech Publications|
|Publication status||Published - 2014|
|Event||6th Forum on New Materials - Montecatini Terme, Tuscany, Italy|
Duration: 2014 Jun 15 → 2014 Jun 19
|Conference||6th Forum on New Materials|
|City||Montecatini Terme, Tuscany|
|Period||2014/06/15 → 2014/06/19|
Bibliographical noteInvited lecture in session FA-2: "Proton-conducting and Alkaline Polymer Electrolyte Fuel Cells". Part of the 13th senior edition of the International Conferences on Modern Materials and Technologies (CIMTEC 2014). Presentation FA-2:IL09.
Subject classification (UKÄ)
- Chemical Sciences