| 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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Kibsgaard, Jakob
Technical University of Denmark
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (15/15 displayed)
- 2024Stable mass-selected AuTiOx nanoparticles for CO oxidationcitations
- 2024Stable mass-selected AuTiO x nanoparticles for CO oxidationcitations
- 2023Ni 5-x Ga 3+x Catalyst for Selective CO 2 Hydrogenation to MeOH :Investigating the Activity at Ambient Pressure and Low Temperature with Microreactors
- 2023Continuous-flow electrosynthesis of ammonia by nitrogen reduction and hydrogen oxidationcitations
- 2023Continuous-flow electrosynthesis of ammonia by nitrogen reduction and hydrogen oxidationcitations
- 2023Ultra-high vacuum compatible reactor for model catalyst study of ammonia synthesis at ambient pressurecitations
- 2023Ni5-xGa3+x Catalyst for Selective CO2 Hydrogenation to MeOH
- 2022Quantitative operando detection of electro synthesized ammonia using mass spectrometrycitations
- 2022Increasing Ammonia Formation Rates of Li-Mediated Ammonia Synthesis with High Surface Area Copper Electrodes
- 2020The Dissolution Dilemma for Low Pt Loading Polymer Electrolyte Membrane Fuel Cell Catalystscitations
- 2019A rigorous electrochemical ammonia synthesis protocol with quantitative isotope measurements.citations
- 2019A rigorous electrochemical ammonia synthesis protocol with quantitative isotope measurementscitations
- 2017Effects of Gold Substrates on the Intrinsic and Extrinsic Activity of High-Loading Nickel-Based Oxyhydroxide Oxygen Evolution Catalystscitations
- 2016Mesoporous platinum nickel thin films with double gyroid morphology for the oxygen reduction reactioncitations
- 2007Cobalt growth on two related close-packed noble metal surfacescitations
Places of action
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article
Effects of Gold Substrates on the Intrinsic and Extrinsic Activity of High-Loading Nickel-Based Oxyhydroxide Oxygen Evolution Catalysts
Abstract
We systematically investigate the effects of Au substrates on the oxygen evolution activities of cathodically electrodeposited nickel oxyhydroxide (NiOOH), nickel–iron oxyhydroxide (NiFeOOH), and nickel–cerium oxyhydroxide (NiCeOOH) at varying loadings from 0 to 2000 nmol of metal/cm2. We determine that the geometric current densities, especially at higher loadings, were greatly enhanced on Au substrates: NiCeOOH/Au reached 10 mA/cm<sup>2</sup> at 259 mV overpotential, and NiFeOOH/Au achieved 140 mA/cm2 at 300 mV overpotential, which were much greater than those of the analogous catalysts on graphitic carbon (GC) substrates. By performing a loading quantification using both inductively coupled plasma optical emission spectrometry and integration of the Ni<sup>2+</sup>/<sup>3+</sup> redox peak, we show that the enhanced activity is predominantly caused by the stronger physical adhesion of catalysts on Au. Further characterizations using impedance spectroscopy and in situ X-ray absorption spectroscopy revealed that the catalysts on Au exhibited lower film resistances and higher number of electrochemically active metal sites.We attribute this enhanced activity to a more homogeneous electrodeposition on Au, yielding catalyst films with very high geometric current densities on flat substrates. By investigating the mass and site specific activities as a function of loading, we bridge the practical geometric activity to the fundamental intrinsic activity.