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Journal ArticleDOI

Spin dependent interactions catalyse the oxygen electrochemistry.

Jose Gracia
- 09 Aug 2017 - 
- Vol. 19, Iss: 31, pp 20451-20456
TLDR
The physical and catalytic properties of the most active compositions are only comprehensible with the consideration of magnetic interactions, and spin dependent potentials via exchange interactions, spin-orbit coupling or through magneto-electric effects catalyse the oxygen electrochemistry.
Abstract
The technological interest of oxygen reduction and evolution reactions, ORR and OER, for the clean use and storage of energy has resulted in the discovery of multiple catalysts; and the physical and catalytic properties of the most active compositions are only comprehensible with the consideration of magnetic interactions. Spin dependent potentials via exchange interactions, spin-orbit coupling or through magneto-electric effects catalyse the oxygen electrochemistry. The best catalysts show metal sites with localized spins and electron delocalization; a correlation exists between the rate constant for charge transfer reactions and spin-dependent electron mobility. Since during the OER and ORR the number of unpaired electrons is not conserved, magnetic potentials in optimum catalysts act as selective gates to enhance the transport of local spin currents. Overall magnetic potentials can reduce the bonding properties of the, donor or acceptor, orbitals in the catalyst, and electrons more easily transfer over the conduction band. The influence of spin dependent forces is generally applicable to oxygen catalysis, and supplements the physical interactions relevant for inorganic or organic, electro or photo, artificial or natural processes.

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Citations
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Journal ArticleDOI

Direct magnetic enhancement of electrocatalytic water oxidation in alkaline media

TL;DR: In this article, the authors demonstrate that the water oxidation performance of mixed oxide NiZnFe4Ox catalysts can be improved by applying a magnetic field from a permanent magnet.
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Engineering High-Spin State Cobalt Cations in Spinel Zinc Cobalt Oxide for Spin Channel Propagation and Active Site Enhancement in Water Oxidation.

TL;DR: In this article, the spin state of cobalt cations in spinel ZnCo 2 O 4 was found to propagate a spin channel to promote spin-selected charge transport during OER and generate better active sites for intermediates adsorption.
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Antiferromagnetic Inverse Spinel Oxide LiCoVO4 with Spin-Polarized Channels for Water Oxidation.

TL;DR: Density functional theory simulation results show that the layered antiferromagnetic LiCoVO4 studied contains magnetically polarized channels, which are able to enhance the selective removal of spin-oriented electrons from the reactants during the OER, which facilitates the accumulation of appropriate magnetic moments for triplet oxygen molecule evolution.
Journal ArticleDOI

Magnetic Field Stimulated Efficient Photocatalytic N2 Fixation over Defective BaTiO3 Perovskites.

TL;DR: In this article, a defective typical perovskite, BaTiO3, shows remarkable activity under an applied magnetic field for photocatalytic N2 fixation with the NH3 yield rate exceeding 1.90mg/L/h.
References
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Journal ArticleDOI

Spintronics: a spin-based electronics vision for the future.

TL;DR: This review describes a new paradigm of electronics based on the spin degree of freedom of the electron, which has the potential advantages of nonvolatility, increased data processing speed, decreased electric power consumption, and increased integration densities compared with conventional semiconductor devices.
Journal ArticleDOI

A perovskite oxide optimized for oxygen evolution catalysis from molecular orbital principles.

TL;DR: The high activity of BSCF was predicted from a design principle established by systematic examination of more than 10 transition metal oxides, which showed that the intrinsic OER activity exhibits a volcano-shaped dependence on the occupancy of the 3d electron with an eg symmetry of surface transition metal cations in an oxide.
Journal ArticleDOI

On the Theory of Electron-Transfer Reactions. VI. Unified Treatment for Homogeneous and Electrode Reactions

TL;DR: A unified theory of homogeneous and electrochemical electron transfer rates using statistical mechanics is developed in this article, where the atomic motions inside the inner coordination shell of each reactant are treated as vibrations and the motions outside are treated by the particle description.
Journal ArticleDOI

Design principles for oxygen-reduction activity on perovskite oxide catalysts for fuel cells and metal–air batteries

TL;DR: These findings reflect the critical influences of the σ orbital and metal-oxygen covalency on the competition between O(2)(2-)/OH(-) displacement and OH(-) regeneration on surface transition-metal ions as the rate-limiting steps of the ORR, and highlight the importance of electronic structure in controlling oxide catalytic activity.
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