Abstract
In this presentation, I will give an overview of some our recent progress in making nanoparticles in relation to electrochemical conversion of sustainable energy [1]. In the first case it will be used to elucidate size dependence and efficiency for catalysts related to the Water splitting i.e. Hydrogen- and in particular Oxygen-evolution reaction (OER) which is the limiting reaction and evaluate the scalability of scarce and expensive elements like the Pt-group metal under acidic conditions [2-4]. We shall discuss caveats of testing catalysts for water splitting [4] and investigate size dependence and isotope labelled experiments will be presented for NiFe nanoparticles for oxygen evolution under alkaline conditions [5]. Here we shall demonstrate a new principle for dynamic detection of gas evolution [6] allowing for a clear distinction between redox states and actual OER by simply measuring the amount of oxygen generated. This will be further pursued for OER catalysis on both Ir and Ru [7] and in the latter case down to 90 mV overpotential [8]. The change of Tafel slopes over many orders of magnitude in current density and mechanisms shall be discussed. If time allow we shall also discuss some of these catalysts used in connection with PEC [9].
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