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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TLDR
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
Citations
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Electrolyzer Durability at Low Catalyst Loading and with Dynamic Operation
Journal ArticleDOI
Molecular complexes in water oxidation: Pre-catalysts or real catalysts
TL;DR: In this article, the authors summarized the commonly used physical techniques and chemical methods that enable to distinguish homogeneous catalysts from heterogeneous ones, and the factors that affect the nature of WOCs, such as reaction conditions, transition metal centers, and supporting ligands.
Journal ArticleDOI
Standardized Benchmarking of Water Splitting Catalysts in a Combined Electrochemical Flow Cell/Inductively Coupled Plasma–Optical Emission Spectrometry (ICP-OES) Setup
Ioannis Spanos,Alexander A. Auer,Sebastian Neugebauer,Xiaohui Deng,Harun Tüysüz,Robert Schlögl +5 more
TL;DR: In this paper, the authors proposed a specialized setup for monitoring the corrosion profiles of metal oxide catalysts during a stability testing protocol, which is specifically designed to standardize the investigation of OER catalysts by means of differentiating between catalyst corrosion and deactivation, oxygen evolution efficiency, and catalyst activity.
Journal ArticleDOI
Iridium nanorods as a robust and stable bifunctional electrocatalyst for pH-universal water splitting
TL;DR: In this article, the authors synthesized Iridium nanorods (Ir-NR/C) by annealing Ir nanoparticles at 300°C requiring comparatively low overpotentials of 290mV, 296mV and 305mV to achieve current density of 10 mA cm−2 for OER catalysis in pH-universal electrolyte.
Journal ArticleDOI
3D Networks of CoFePi with Hierarchical Porosity for Effective OER Electrocatalysis
Yao Zhou,Hua Chun Zeng +1 more
TL;DR: The binary CoFePi network shows superior oxygen evolution reaction (OER) electrocatalytic activity and the trinary CoFeNiPi demonstrates similar OER catalytic performance, and the two phosphate networks also exhibit remarkable catalytic stability.
References
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Journal ArticleDOI
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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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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 ).