Rüdiger Kötz

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Correlation between capacitances of porous carbons in acidic and aprotic EDLC electrolytes T. A. Centeno , M. Hahn , J.A. Fernández , R. Kötz b and F. Stoeckli* c a Instituto Nacional del Carbón-C.S.I.C., Apartado 73. 33080 Oviedo (Spain) b Electrochemistry Laboratory, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland c IMT-Chimie des Surfaces,(More)
Nanoparticles are key components in the advancement of future energy technologies, thus, strategies for preparing nanoparticles in large volume by techniques that are cost-effective are required. In the substitution of fossil-fuels by renewable energy resources, nanometer-sized particles play a key role for synthesizing energy vectors from varying and(More)
Suspension cultures of Coffea arabica L. are a useful source for methyltransferase preparations of high activity catalysing the transfer of methylgroups from S-adenosyl-L-methionine to 7-methylxanthine and to theobromine producing theobromine and caffeine respectively. Surprisingly, these enzyme activities are not correlated with the availability of(More)
The electronic properties of citrate stabilised Ag nanoparticles with sizes ranging from 4 to 35 nm were investigated by the Kelvin probe method and high resolution XPS. Two and three dimensional assemblies of the particles were prepared by electrostatic adsorption from aqueous solution onto poly-l-lysine modified surfaces. The work function of the Ag(More)
In recent years, the oxygen evolution reaction (OER) has attracted increased research interest due to its crucial role in electrochemical energy conversion devices for renewable energy applications. The vast majority of OER catalyst materials investigated are metal oxides of various compositions. The experimental results obtained on such materials strongly(More)
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In this work, high surface area antimony doped tin oxide (Sb-SnO2) has been synthesized using a modified sol-gel synthesis method. The bulk and surface properties of the metal oxide support have been investigated as a function of the processing conditions. A change in the Sb-SnO2 processing conditions, while preserving an overall invariant bulk composition,(More)
Fluorine makes the difference! Bis(2,2'-biphenoxy)borates decorated with fluorine substituents have been synthesized and studied in supercapacitor test cells (see scheme). A clear trend towards higher electrochemical stability with the increase of the fluorine content has been observed. For a maximum performance, only two fluorine substituents per benzene(More)
The effect of water contamination in 1 mol L -1 Et4NBF4 dissolved in acetonitrile or in propylene carbonate as electrolyte on the capacitance fading of activated carbon based electrochemical double layer capacitors has been investigated during constant voltage load tests at 2.75 V and 3.5 V cell voltage. For a cell voltage of 2.75 V, water contamination in(More)