| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Szot, K.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (9/9 displayed)
- 2014Impact of composition and crystallization behavior of atomic layer deposited strontium titanate films on the resistive switching of Pt/STO/TiN devicescitations
- 2009Dielectric properties and phase transition in SrBi2Nb2O9–SrBi2Ta2O9 solid solutioncitations
- 2009Hydrophilic carbon nanoparticle-laccase thin film electrode for mediatorless dioxygen reduction SECM activity mapping and application in zinc-dioxygen batterycitations
- 2008Introducing hydrophilic carbon nanoparticles into hydrophilic sol-gel film electrodescitations
- 2008Birefringence above T_c in single crystals of barium titanatecitations
- 2007A porous ITO nanoparticles modified electrode for the redox liquid immobilizationcitations
- 2006Switching the electrical resistance of individual dislocations in single-crystalline SrTiO3citations
- 2001Defects in alkaline earth titanate thin films - the conduction behavior of doped BST
- 2000Cation loss of BaCa0.393Nb0.606O2.91 in aqueous media : amorphization at room temperature
Places of action
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article
Hydrophilic carbon nanoparticle-laccase thin film electrode for mediatorless dioxygen reduction SECM activity mapping and application in zinc-dioxygen battery
Abstract
Laccase from Cerrena unicolor was adsorbed on hydrophilic carbon nanoparticles (diameter = ca. 7.8 nm) modified with phenyl sulfonate groups and immobilized on an ITO electrode surface in a sol-gel processed silicate film. As shown by scanning electron and atomic force microscopies, the nanoparticles are evenly distributed on the electrode surface forming small aggregates of tens of nanometers in size. The mediator-free electrode exhibits significant and pH-dependent electrocatalytic activity towards dioxygen reduction. The maximum catalytic current density (95 mu A cm(-2)) is obtained at pH 4.8 corresponding to maximum activity of the enzyme. Under these conditions dioxygen electroreduction commences at 0.575 V vs. Ag vertical bar AgClsat, a value close to the formal potential of the T1 redox centre of the laccase. The scanning electrochemical microscopy images obtained in redox competition mode exploiting mediatorless electrocatalysis show that the laccase is evenly distributed in the composite him. The obtained electrode was applied as biocathode in a zinc-dioxygen battery operating in 0.1 M McIlvaine buffer (pH 4.8). It provides 1.48V at open circuit and a maximum power density 17.4 mu W cm(-2) at 0.7 V.