X-ray photoelectron study of annealed Co thin film on Si surface

Sharma, A.; Tripathi, S.; Shripathi, T.

doi:10.1016/j.apsusc.2009.08.007

Cited by 9 publications

(3 citation statements)

References 45 publications

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“…The satellite peaks of the Co 2p 1/2 and 2p 3/2 core levels are located at 803.7 and 786.9 eV, respectively . The peak at 773.3 eV was related to the Co LMM Auger peaks …”

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confidence: 88%

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Synergy of Nb Doping and Surface Alloy Enhanced on Water–Alkali Electrocatalytic Hydrogen Generation Performance in Ti‐Based MXene

Sun

et al. 2019

Advanced Science

120

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Presented are the theoretical calculation and experimental studies of a Ti 3 C 2 T x MXene‐based nanohybrid with simultaneous Nb doping and surface transition metal alloy modification. Guided by the density functional theory calculation, the Nb doping can move up the Fermi energy level to the conduction band, thus enhancing the electronic conductivity. Meanwhile, the surface modification by Ni/Co alloy can moderate the surface M–H affinity, which will further enhance the hydrogen evolution reaction (HER) activity. A series of Ni/Co alloy attached on Nb‐doped Ti 3 C 2 T x MXene nanohybrids (denoted as NiCo@NTM) are successfully prepared. As expected, the Ni 0.9 Co 0.1 @ NTM nanohybrids present an extraordinary HER activity in alkaline solution, which only needs an overpotential (η) of 43.4 mV to reach the current density of 10 mA cm −2 in 1 m KOH solution and shows good stability. The performance of the Ni 0.9 Co 0.1 @ NTM nanohybrids is comparable to the commercial 10% Pt/C electrode (34.4 mV@10 mA cm −2 ) and is better than most state‐of‐the‐art Pt‐free HER catalysts. Inspired by the facile synthesis process and chemical versatility of both MXene and transition metal alloys, the nanohybrids reported here are promising non‐noble metal electrocatalysts for water–alkali electrolysis.

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“…The satellite peaks of the Co 2p 1/2 and 2p 3/2 core levels are located at 803.7 and 786.9 eV, respectively . The peak at 773.3 eV was related to the Co LMM Auger peaks …”

mentioning

confidence: 88%

“…[25] The peak at 773.3 eV was related to the Co LMM Auger peaks. [28] The electrocatalytic HER activities of as-synthesized NiCo@ NTM nanohybrids were evaluated by linear sweep voltammetry (LSV) in 1 m KOH solution. The ohmic potential drop was also corrected.…”

Section: Doi: 101002/advs201900116mentioning

confidence: 99%

Synergy of Nb Doping and Surface Alloy Enhanced on Water–Alkali Electrocatalytic Hydrogen Generation Performance in Ti‐Based MXene

Sun

et al. 2019

Advanced Science

120

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“…Magnetic thin film preparation techniques are crucial for the microstructure and magnetic properties of thin films. At present, the main techniques Materials 2023, 16, 3395 2 of 11 for the preparation of magnetic thin films include molecular beam epitaxy [17,18], magnetron sputtering coating [19][20][21], and vacuum evaporation coating [22,23]. Among them, molecular beam epitaxy and magnetron sputtering require ultra-high vacuum, precise air pressure control, and temperature control system.…”

Section: Introductionmentioning

confidence: 99%

Structure and Performance Optimization of Co Magnetic Thin Films Deposited by Vacuum Evaporation Coating

Mao

Tang

et al. 2023

Materials

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Co magnetic films are widely used in high-frequency magnetic recording and vertical magnetic recording due to their high saturation magnetization and magnetocrystalline anisotropy. In this work, ferromagnetic Co magnetic films were prepared on copper substrate by vacuum evaporation combined with heat treatment (H2 atmosphere), to investigate the impact of film thickness and annealing temperature on microstructure and magnetic properties. The results show that with the increase in annealing temperature, the Co thin film physical phase does not change significantly, the crystallinity increases, and the grain size increases, which is consistent with the results obtained from the SEM morphology map of the sample surface, leading to an increase in coercivity. By annealing experiments (atmospheric atmosphere) on Co magnetic films with and without an Al protective layer, as shown by scanning electron microscopy microscopic characterization results, it was verified that the Al layer can protect the inner Co layer from oxidation. As the film thickness increases from 10 to 300 nm, the magnetic properties of Co films change significantly. The saturation magnetization gradually increases from 0.89 to 5.21 emu/g, and the coercivity increases from 124.3 to 363.8 Oe. The remanence ratio of the 10 nm magnetic film is 0.82, which is much higher than the film remanence ratio of 0.46 at 50 nm. This is because when the thickness of the film is between 10 and 50 nm, the magnetic moments partially deviate from the in-plane direction, and the out-of-plane component reduces the film remanence ratio. This study shows that optimizing annealing temperature and film thickness can effectively control the structure and magnetic properties of Co magnetic films, which is of great significance for the development of the magnetic recording field.

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Bimetal Metaphosphate/Molybdenum Oxide Heterostructure Nanowires for Boosting Overall Freshwater/Seawater Splitting at High Current Densities

Wang,

et al. 2024

Advanced Science

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Exploring excellent non‐noble bifunctional electrocatalysts for freshwater/seawater splitting at high current densities has attracted extensive interest owing to strong anodic oxidation and severe chloride corrosion challenges. Herein, hierarchical bimetal Ni‐Co metaphosphate/molybdenum oxide heterostructure nanowires (NiCoMoPO) are rationally designed and fabricated to efficiently boost oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in alkaline freshwater/seawater, where the favorable electronic structure from heterostructures, signified by X‐ray absorption spectra, endows NiCoMoPO with the enhanced intrinsic activity, while its hierarchical nanowire structure and heterostructures provide abundant active sites. Additionally, the PO3− improves the chloride‐corrosion resistance and efficiently facilitates the OER kinetics verified by theoretical and experimental studies. Therefore, NiCoMoPO drives 1000 mA cm−2 at low overpotentials of 467 and 442 mV for OER and HER in alkaline freshwater respectively, as well as a small cell voltage of 2.135 V for overall freshwater splitting with robust durability of 300 h. Impressively, due to the strong corrosion resistance, at 500 mA cm−2 of overall seawater splitting, NiCoMoPO maintains almost 2.096 V for 1200 h, indicating promising practical applications. This work sheds light on the rational design and fabrication of outstanding electrocatalysts at high current densities of seawater/freshwater splitting.

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X-ray photoelectron study of annealed Co thin film on Si surface

Cited by 9 publications

References 45 publications

Synergy of Nb Doping and Surface Alloy Enhanced on Water–Alkali Electrocatalytic Hydrogen Generation Performance in Ti‐Based MXene

Synergy of Nb Doping and Surface Alloy Enhanced on Water–Alkali Electrocatalytic Hydrogen Generation Performance in Ti‐Based MXene

Structure and Performance Optimization of Co Magnetic Thin Films Deposited by Vacuum Evaporation Coating

Bimetal Metaphosphate/Molybdenum Oxide Heterostructure Nanowires for Boosting Overall Freshwater/Seawater Splitting at High Current Densities

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