Magnetically-Induced Flow during Electropolishing

Monzón, Lorena M. A.; Nair, Vishnu; Reilly, Barry; Coey, J. M. D.

doi:10.1149/2.0581813jes

“…It should be noticed that the use of magnetic fields in water electrolysis has been studied in the past, 31 – 36 in which the mass transport in the electrochemical process was found to be affected by the Lorentzian movement, i.e. the diffusion of regents and the release of the generated gas bubbles are promoted.…”

Section: Resultsmentioning

confidence: 99%

Spin-polarized oxygen evolution reaction under magnetic field

Ren

¹

,

Wu

²

,

Sun

³

et al. 2021

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The oxygen evolution reaction (OER) is the bottleneck that limits the energy efficiency of water-splitting. The process involves four electrons’ transfer and the generation of triplet state O2 from singlet state species (OH- or H2O). Recently, explicit spin selection was described as a possible way to promote OER in alkaline conditions, but the specific spin-polarized kinetics remains unclear. Here, we report that by using ferromagnetic ordered catalysts as the spin polarizer for spin selection under a constant magnetic field, the OER can be enhanced. However, it does not applicable to non-ferromagnetic catalysts. We found that the spin polarization occurs at the first electron transfer step in OER, where coherent spin exchange happens between the ferromagnetic catalyst and the adsorbed oxygen species with fast kinetics, under the principle of spin angular momentum conservation. In the next three electron transfer steps, as the adsorbed O species adopt fixed spin direction, the OER electrons need to follow the Hund rule and Pauling exclusion principle, thus to carry out spin polarization spontaneously and finally lead to the generation of triplet state O2. Here, we showcase spin-polarized kinetics of oxygen evolution reaction, which gives references in the understanding and design of spin-dependent catalysts.

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“…It should be noticed that the use of magnetic fields in water electrolysis has been studied in the past, [31][32][33][34][35][36] in which the mass transport in the electrochemical process was found to be affected by the Lorentzian movement, i.e. the diffusion of regents and the release of the generated gas bubbles are promoted.…”

Section: Magnetic and Electrochemical Characterizationsmentioning

confidence: 99%

Spin-Polarized Oxygen Evolution Reaction Under Magnetic Field

Ren¹,

Wu²,

Sun³

et al. 2021

Preprint

0

View full text Add to dashboard Cite

<a></a><a>The oxygen evolution reaction (OER) is the bottleneck that limits the energy efficiency of water-splitting. The process involves four electrons’ transfer and the generation of triplet state O2 from singlet state species (OH- or H2O). Recently, explicit spin selection was described as a possible way to promote OER in alkaline conditions, but the specific spin-polarized kinetics remains unclear. </a><a></a><a>Here, we report that </a><a>by using ferromagnetic ordered catalysts as the spin polarizer for spin selection under </a><a></a><a>a constant magnetic field</a>, <a>the OER can be enhanced.</a> However, it does not applicable to non-ferromagnetic catalysts. We found that the spin <a>polarization occurs at the first electron transfer step in OER</a>, where <a></a><a>coherent spin exchange happens </a>between the <a></a><a>ferromagnetic</a> catalyst and the adsorbed oxygen species <a>with fast kinetics</a>, under the principle of spin angular momentum conservation. In the next three electron transfer steps, as the adsorbed O species adopt fixed spin direction, the OER electrons need to follow the Hund rule and Pauling exclusion principle, thus to carry out spin polarization spontaneously and finally lead to the generation of triplet state O2. Here, we showcase spin-polarized kinetics of oxygen evolution reaction, which gives references in the understanding and design of spin-dependent catalysts.

show abstract

“…It should be noticed that the use of magnetic fields in water electrolysis has been studied in the past, [31][32][33][34][35][36] in which the mass transport in the electrochemical process was found to be affected by the Lorentzian movement, i.e. the diffusion of regents and the release of the generated gas bubbles are promoted.…”

Section: Magnetic and Electrochemical Characterizationsmentioning

confidence: 99%

Spin-Polarized Oxygen Evolution Reaction Under Magnetic Field

Ren¹,

Wu²,

Sun³

et al. 2021

Preprint

0

View full text Add to dashboard Cite

<a></a><a>The oxygen evolution reaction (OER) is the bottleneck that limits the energy efficiency of water-splitting. The process involves four electrons’ transfer and the generation of triplet state O2 from singlet state species (OH- or H2O). Recently, explicit spin selection was described as a possible way to promote OER in alkaline conditions, but the specific spin-polarized kinetics remains unclear. </a><a></a><a>Here, we report that </a><a>by using ferromagnetic ordered catalysts as the spin polarizer for spin selection under </a><a></a><a>a constant magnetic field</a>, <a>the OER can be enhanced.</a> However, it does not applicable to non-ferromagnetic catalysts. We found that the spin <a>polarization occurs at the first electron transfer step in OER</a>, where <a></a><a>coherent spin exchange happens </a>between the <a></a><a>ferromagnetic</a> catalyst and the adsorbed oxygen species <a>with fast kinetics</a>, under the principle of spin angular momentum conservation. In the next three electron transfer steps, as the adsorbed O species adopt fixed spin direction, the OER electrons need to follow the Hund rule and Pauling exclusion principle, thus to carry out spin polarization spontaneously and finally lead to the generation of triplet state O2. Here, we showcase spin-polarized kinetics of oxygen evolution reaction, which gives references in the understanding and design of spin-dependent catalysts.

show abstract

Magnetically-Induced Flow during Electropolishing

Cited by 18 publications

References 35 publications

Spin-polarized oxygen evolution reaction under magnetic field

Spin-polarized oxygen evolution reaction under magnetic field

Spin-Polarized Oxygen Evolution Reaction Under Magnetic Field

Spin-Polarized Oxygen Evolution Reaction Under Magnetic Field

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