Journal ArticleDOI
Electrocatalytic Oxygen Evolution Reaction (OER) on Ru, Ir, and Pt Catalysts: A Comparative Study of Nanoparticles and Bulk Materials
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In this article, the intrinsic catalytic activity and durability of carbon supported Ru, Ir, and Pt nanoparticles and corresponding bulk materials for the electrocatalytic oxygen evolution reaction (OER) were examined by surface-sensitive cyclic voltammetry.Abstract:
A comparative investigation was performed to examine the intrinsic catalytic activity and durability of carbon supported Ru, Ir, and Pt nanoparticles and corresponding bulk materials for the electrocatalytic oxygen evolution reaction (OER). The electrochemical surface characteristics of nanoparticles and bulk materials were studied by surface-sensitive cyclic voltammetry. Although basically similar voltammetric features were observed for nanoparticles and bulk materials of each metal, some differences were uncovered highlighting the changes in oxidation chemistry. On the basis of the electrochemical results, we demonstrated that Ru nanoparticles show lower passivation potentials compared to bulk Ru material. Ir nanoparticles completely lost their voltammetric metallic features during the voltage cycling, in contrast to the corresponding bulk material. Finally, Pt nanoparticles show an increased oxophilic nature compared to bulk Pt. With regard to the OER performance, the most pronounced effects of nanosca...read more
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Stoichiometric and non-stoichiometric tungsten doping effect in bismuth vanadate based photoactive material for photoelectrochemical water splitting
TL;DR: In this article, a deep investigation was carried out to examine the effect of non-stoichiometric W doping in BiVO4 system and the electrochemical impedance analysis showed the presence of low interfacial resistance, lower charge transfer resistance and high charge donor/surface state density.
Journal ArticleDOI
Role of Lattice Oxygen in the Oxygen Evolution Reaction on Co3O4: Isotope Exchange Determined Using a Small-Volume Differential Electrochemical Mass Spectrometry Cell Design.
TL;DR: In this paper, the role of lattice oxygen of metal oxide catalysts in the oxygen evolution reaction (OER) is demonstrated by isotope labeling together with the differential electrochemical mass spectrometry (DEMS) method.
Journal ArticleDOI
Oxygen Evolution Reaction at Microporous Pt Layers: Differentiated Electrochemical Activity between Acidic and Basic Media.
TL;DR: The electrocatalytic oxygen evolution reaction (OER) activities at porous Pt layers with pore dimensions in the microporous range were examined and demonstrated the different accessibility of reactants in OER: water and hydrated hydroxide ions.
Journal ArticleDOI
One step fabrication of carbon supported cobalt pentlandite (Co9S8) via the thermolysis of lignin and Co3O4
TL;DR: In this article, a method for one-step fabrication of carbon supported (biochar) Co9S8 composite via the thermo-chemical process of cobalt oxide (Co3O4) and lignin under CO2 atmosphere was proposed.
Journal ArticleDOI
Colloidal synthesis of iridium-iron nanoparticles for electrocatalytic oxygen evolution
TL;DR: In this paper, the colloidal synthesis of iridium-iron alloy nanoparticles with an average diameter of 2.4 nm was reported, achieving a current density of 10 mA cm−2 in acidic and alkaline conditions at overpotentials of 278 and 286 mV, respectively.
References
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TL;DR: In this article, the authors present a chemical analysis of X-ray diffraction by Xray Spectrometry and phase-diagram Determination of single crystal structures and phase diagrams.
Journal ArticleDOI
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Journal ArticleDOI
Universality in Oxygen Evolution Electrocatalysis on Oxide Surfaces
Isabela C. Man,Hai-Yan Su,Federico Calle-Vallejo,Heine Anton Hansen,José I. Martínez,Nilay İnoğlu,John R. Kitchin,Thomas F. Jaramillo,Jens K. Nørskov,Jan Rossmeisl +9 more
TL;DR: In this article, a large database of HO* and HOO* adsorption energies on oxide surfaces was used to analyze the reaction free energy diagrams of all the oxides in a general way.
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Electrolysis of water on oxide surfaces
TL;DR: In this paper, density functional theory (DFT) calculations are performed to analyze the electrochemical water-splitting process producing molecular oxygen (O 2 ) and hydrogen (H 2 ).