Bio-inspired catalysts can provide a clean and sustainable alternative to traditional stoichiometric processes. Porphyrins are widely used by nature in active sites of enzymes for electron and energy transfer reactions and as oxygen transporters. Furthermore, they are chemically and thermally robust extended molecules thus affording great potential as building blocks for porous coordination polymers. Building such hybrid materials is therefore an elegant path to access controlled porosity with a very high concentration of active sites.<br/>The structural diversity of metal organic frameworks combined with their high specific surface area has made them convincing candidates for catalytic applications. In our research we aim to develop porphyrin-based MOFs suitable for energy-related applications. An important focus is materials with improved stability and the possibility to control and tune the real nature of active site. This allows a deep structure/property study and rationalization. Thus we developed porphyrinic MOF systems with improved stability, as well as tuneable accessible active sites. Synthesis and characterizations of these materials will be presented. These redox-active materials have been used to modify electrodes and their activity was assessed for oxygen reduction catalysis: a key reaction in fuel cells technology. Electrocatalytic performances and mechanistic studies for oxygen reduction process will be discussed.

Porphyrin-based metal organic frameworks for electrocatalysis

253rd National Meeting (2017)

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