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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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Horch, Sebastian
Technical University of Denmark
in Cooperation with on an Cooperation-Score of 37%
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conferencepaper
Oxygen Evolution on Model Well-Characterised Mass-Selected Nanoparticles of RuOx
Abstract
In recent years, hydrogen production from polymer electrolyte membrane (PEM) electrolysis has attracted increasingly interest in the development of a clean/ CO2 free technology for energy storage [1]. The majority of the efficiency losses are at the anode [2], where oxygen is evolved, according to the reaction: 2H2O --> O2 + 4H+ + 4e- The most active and widely used catalysts for the oxygen evolution reaction (OER) are RuOx based materials. However, RuOx corrodes under reaction conditions. Moreover, Ru is very expensive and scarce [3]. In the current investigation, we focus on the evaluation of (a) oxygen evolution activity and (b) corrosion of well defined, mass selected Ru nanoparticles as a function of size and shape. We adapt a methodology previously used in our laboratory to study to investigate the oxygen reduction reaction [4]. The size selected electrocatalysts are prepared using an ultra-high-vacuum (UHV) compatible technique where nanoparticles are aggregated in a magnetron sputter source. This technique has distinct advantages, as it results in a high degree of control over critical parameters such as particle size, coverage and density [5]. By investigating such well-defined catalysts, we can improve our understanding of the relationship between catalyst structure and reactivity. The catalysts are formed from a ruthenium target, deposited under vacuum directly onto a glassy carbon or Au(111) electrode and then oxidized in furnace at 400 °C under 1 bar oxygen. The structure and composition are tested ex-situ before and after annealing using X-ray Photoelectron Spectroscopy (XPS), high resolution Transmission Electron Microscopy (HR-TEM) and Scanning Electron Microscopy (SEM). Electrochemical activity and stability are tested ex-situ in a Rotating Ring Disk Electrode set-up [6]. Furthermore, Electrochemical Scanning Tunnelling Microscopy (EC-STM) is used to directly observe the catalyst dissolution under reaction conditions. The EC-STM images are acquired in Ar saturated 0,05 M H2SO4, while the ...