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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Facile Synthesis of Mesoporous α-Fe 2 O 3 @g-C 3 N 4 -NCs for Efficient Bifunctional Electro-catalytic Activity (OER/ORR)
Osamah Alduhaish,Mohd Ubaidullah,Abdullah M. Al-Enizi,Norah Alhokbany,Saad M. Alshehri,Jahangeer Ahmed +5 more
TL;DR: The mesoporous α-Fe2O3@g-C3N4-NCs bifunctional electro-catalysts can be considered as potential future low-cost alternatives for Pt/C catalysts, which are currently used in fuel cells.
Journal ArticleDOI
Mn-Doped Co–N–C Dodecahedron as a BifunctionalElectrocatalyst for Highly Efficient Zn–Air Batteries
TL;DR: The progress of high efficiency electrocatalysts toward the oxygen reduction reaction and oxygen evolution reaction (ORR and OER) is central to reproductive fuel cells and rechargeable metal-air batteries.
Journal ArticleDOI
Co3O4–x-Carbon@Fe2–yCoyO3 Heterostructural Hollow Polyhedrons for the Oxygen Evolution Reaction
Wangwang Xu,Weiwei Xie,Ying Wang +2 more
TL;DR: The design and synthesis of metal-organic framework (MOF)-derived nanomaterials in this work offer new opportunities for developing novel and efficient electrocatalysts in electrochemical devices.
Journal ArticleDOI
Electrocatalytic and Enhanced Photocatalytic Applications of Sodium Niobate Nanoparticles Developed by Citrate Precursor Route.
TL;DR: As-prepared sodium niobate nanoparticles show enhanced photocatalytic property (86% removal) towards the degradation of rose Bengal dye and dielectric behaviour at different sintering temperatures was explained by Koop's theory and Maxwell-Wagner mechanism.
Journal ArticleDOI
Vanadium nanobelts coated nickel foam 3D bifunctional electrode with excellent catalytic activity and stability for water electrolysis
Yu Yu,Pei Li,Xiaofang Wang,Wenyu Gao,Zongxu Shen,Yanan Zhu,Shuliang Yang,Weiguo Song,Kejian Ding +8 more
TL;DR: A vanadium nanobelts coating on a nickel foam is proposed as an excellent 3D bifunctional electrode for water electrolysis here, which exhibits high activities with overpotentials of 292 and 176 mV at 10 mA cm(-2) for OER and HER, 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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TL;DR: In this article, the Scherrer constants of simple regular shapes have been determined for all low-angle reflections (h2 + k2 + l2 ≤ 100) for four measures of breadth.
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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.
Journal ArticleDOI
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 ).