Close-to-ideal spin polarization in zinc-doped Fe–Mo double perovskites at the nanoscale

Hien, Le Duc; Anh, Luong Ngoc; Nguyen, Phuc Duong; Loan, To Thanh; Soontaranon, Siriwat; Nguyet, Dao Thi Thuy; Khoa, T.V.; Visser, A. de

doi:10.1016/j.ceramint.2021.09.110

Cited by 4 publications

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“…Notably, the HER process does not involve any intrinsically spin‐polarized intermediates, 24,66 so we speculate that the magnetic field had a direct effect on the catalytic material, which was confirmed by magnetoresistance (MR) measurements (Figure 5A). At room temperature, the resistivity of Mo‐NiS x /NF decreases by 0.96% under a magnetic field strength of 10000 G. Although the change of MR is small, the spin polarization rate of Mo‐NiS x /NF was calculated to be high: 9.75% 67,68 . According to literature reports, spin‐polarized transport across grain boundaries makes an important contribution to the resistivity of materials 69,70 .…”

Section: Resultsmentioning

confidence: 94%

“…At room temperature, the resistivity of Mo-NiS x /NF decreases by 0.96% under a magnetic field strength of 10000 G. Although the change of MR is small, the spin polarization rate of Mo-NiS x /NF was calculated to be high: 9.75%. 67,68 According to literature reports, spin-polarized transport across grain boundaries makes an important contribution to the resistivity of materials. 69,70 Adjacent grain boundaries can self-align to enhance the degree of electron tunneling across the grain boundary junctions, thereby reducing resistivity.…”

Section: Magnetic Field-enhanced Overall Water Splittingmentioning

confidence: 99%

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et al. 2023

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Retraction: Zhang Y, Chen M, Guo P, et al. Magnetic field‐enhanced water splitting enabled by bifunctional molybdenum‐doped nickel sulfide on nickel foam. Carbon Energy. 2023; e351. https://doi.org/10.1002/cey2.351.The above article, published online on 14 March 2023 on Wiley Online Library (wileyonlinelibrary.com), has been retracted by agreement between the authors, journal Editor‐in‐Chief, Shun Wang, and John Wiley & Sons, Inc.The retraction has been agreed as the authors found inconsistencies in the experimental data after publication. Thus, the experimental results are considered insufficient to support the conclusions of this manuscript.

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Section: Resultsmentioning

confidence: 94%

Section: Magnetic Field-enhanced Overall Water Splittingmentioning

confidence: 99%

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Magnetic Field Enhanced Electrocatalytic Oxygen Evolution of NiFe‐LDH/Co₃O₄ p‐n Heterojunction Supported on Nickel Foam

et al. 2022

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universal anode reaction for water electrolysis, carbon dioxide reduction, and metalair batteries, which usually requires the use of noble metal catalyst due to the sluggish kinetics. [1] However, due to the high cost and scarcity, large-scale application of noble metals is greatly restricted. Therefore, the development of non-noble metal catalysts with high efficiency and low cost is of great importance. In particular, transition metal-based layer double hydroxides (LDHs) have attracted extensive attention because of their facile synthesis and adjustable composition. [2] The OER performance of LDHs is limited by active sites and poor intrinsic activity. [3] Moreover, due to their semiconductor characteristics, a Schottky barrier may be formed when contacting the conductive substrate, which greatly hinders the charge transfer. [4] A variety of strategies, including size modulation, composite with conductive materials, heteroatomic doping, defect engineering, and interface engineering, have been investigated to further regulate the OER performance of LDHs. [5] It is noteworthy that adjusting the electronic structure of the catalysts can optimize the adsorption energy of the intermediates and improve the reaction kinetics. [5c] In this regard, the construction of p-n heterojunction is a promising strategy to regulate the local electronic structure of catalytically active sites, as the difference of Fermi level (E f ) between n-type semiconductor and p-type semiconductor results in the spontaneous flow of electrons at the interface to achieve thermal equilibrium. As a consequence, the activity, selectivity, and stability can be substantially improved by binary catalysts when compared with single-component catalysts. For example, the p-n junction in FeNi-LDH/CoP with positively charged FeNi-LDH in the space-charge region could greatly improve the OER performance, [6] and the formed CuO@CoOOH p-n heterojunction could remarkably modify the electronic properties and serve as an excellent OER catalyst. [7] In addition to ameliorating the catalyst materials, the emergence of intensification strategies by external fields such as gravity field, light field, ultrasonic, and electric field, has become a new trend in the field of electrochemistry, which can effectively improve the mass transfer on the electrode surface and change the reaction kinetics. [8] Interestingly, the latest research confirms that coupling the magnetic field with electrochemistry Here, a strategy to regulate the electron density distribution by integrating NiFe layered double hydroxides (NiFe-LDH) nanosheets with Co 3 O 4 nanowires to construct the NiFe-LDH/Co 3 O 4 p-n heterojunction supported on nickel foam (NiFe-LDH/Co 3 O 4 /NF) for electrocatalytic oxygen evolution reaction (OER) is proposed. The p-n heterojunction can induce the charge redistribution in the heterogeneous interface to reach Fermi level alignment, thus modifying the adsorption free energy of *OOH and improving the intrinsic activity of the catalyst. As a result, NiFe-LDH/Co 3 ...

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Domain structure and finite-size effects in Sr2-La FeMoO6 nanoparticles: A study by magnetic measurements

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Nguyet

Loan

et al. 2023

Current Applied Physics

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Close-to-ideal spin polarization in zinc-doped Fe–Mo double perovskites at the nanoscale

Cited by 4 publications

References 54 publications

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Magnetic Field Enhanced Electrocatalytic Oxygen Evolution of NiFe‐LDH/Co₃O₄ p‐n Heterojunction Supported on Nickel Foam

Domain structure and finite-size effects in Sr2-La FeMoO6 nanoparticles: A study by magnetic measurements

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Close-to-ideal spin polarization in zinc-doped Fe–Mo double perovskites at the nanoscale

Cited by 4 publications

References 54 publications

Retraction

Retraction

Magnetic Field Enhanced Electrocatalytic Oxygen Evolution of NiFe‐LDH/Co3O4 p‐n Heterojunction Supported on Nickel Foam

Domain structure and finite-size effects in Sr2-La FeMoO6 nanoparticles: A study by magnetic measurements

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Magnetic Field Enhanced Electrocatalytic Oxygen Evolution of NiFe‐LDH/Co₃O₄ p‐n Heterojunction Supported on Nickel Foam