Stacking fault energy and electronic structure of molybdenum under solid solution softening/hardening

Liu, Pan; Liu, Liu-cheng; Gong, H.R.

doi:10.1007/s11771-021-4584-2

Cited by 8 publications

(2 citation statements)

References 52 publications

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“…Molybdenum is a rare metal with a high melting point, high strength, and high elastic coefficient. As a strategic mineral resource, molybdenum is widely used in the fields of iron and steel, petroleum, chemical industry, electrical and electronic technology, medicine, and agriculture [1][2][3]. Molybdenum deposits in China are mainly porphyry and porphyry skarn molybdenum deposits, which have the problems of low raw ore grade, fine embedded particle size, low recovery, and high production cost [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Influence Mechanism of Magnetized Modified Kerosene on Flotation Behavior of Molybdenite

Xiao

Jin

et al. 2021

Minerals

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The effects and mechanism of magnetized kerosene on the flotation behaviors of molybdenite were studied by micro-flotation, ultraviolet spectrum, infrared spectrum, surface tension, and liquid viscosity. According to the results of micro-flotation, magnetized kerosene improved the flotation recovery of molybdenite, and the improvements were more obvious with smaller molybdenite particles. Spectral analysis showed that the magnetization did not change the chemical composition of kerosene, but transformed the linear aliphatic hydrocarbons in kerosene into linear isomers and reduced the lengths of the carbon chains. Moreover, the magnetization reduced the viscosity of kerosene and oil/water interfacial tension, and improved the dispersion of kerosene in the pulp. The external magnetic field transformed the disorder of the additional magnetic moment in the kerosene molecules into order, and reduced the compactness of the kerosene molecules. The experimental results provided a theoretical explanation for the role of magnetization in mineral flotation.

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Section: Introductionmentioning

confidence: 99%

Influence Mechanism of Magnetized Modified Kerosene on Flotation Behavior of Molybdenite

Xiao

Jin

et al. 2021

Minerals

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“…Ni of 125 mJ m -2 and Mo of 569 mJ m -2 ) are di cult to generate SF with conventionally mild strategies. 22,23 It is essential to nd facile and mild synthetic methods to create SF in high γ SFE metals with promising HER performance like MoNi to tune the metallic electronic and atomic structures and to optimize their electrochemical activities.…”

mentioning

confidence: 99%

Stacking Faults Defect-Rich MoNi Alloy for Ultrahigh-Performance Hydrogen Evolution

Wang

Arandiyan

Mofarah

et al. 2023

Preprint

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Producing green hydrogen in a cost-competitive manner via water electrolysis will make the long-held dream of meeting energy needs with hydrogen instead of fossil fuel a reality. Although platinum-based catalysts show good performance towards hydrogen evolution reaction (HER), the high cost and scarce abundance challenge their economic viability for large-scale implementation. Here, we engineer high fractions of stacking fault defects in MoNi nanosheets to form a high-performance electrocatalyst (d-MoNi) through a combined chemical and thermal reduction strategy. Using d-MoNi as an electrode for HER afforded ultralow overpotential of 63 and 120 mV at current densities of -500 and -1000 mA cm-2 in 1 M KOH, respectively. Besides, the stacking fault defect-rich d-MoNi exhibits 4 orders of magnitude higher turnover frequency than benchmark 20% Pt/C, together with excellent durability (>100 h) at high current density of 1000 mA cm-2, making it one of the best-performing non-platinum catalysts for HER. The experimental and theoretical results reveal that the abundant stacking faults in d-MoNi induce a compressive strain, decreasing the proton adsorption energy and promoting the concomitant combination of adsorbed hydrogen into molecular hydrogen and the desorption of the molecular hydrogen, therefore enhancing the HER performance. This work provides a new synthetic route to engineer defective metal and metal alloy electrocatalysts for emerging applications in electrochemical energy conversion and storage.

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Stacking Fault‐Enriched MoNi₄/MoO₂ Enables High‐Performance Hydrogen Evolution

Wang,

Arandiyan,

Mofarah

et al. 2024

Advanced Materials

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Producing green hydrogen in a cost‐competitive manner via water electrolysis will make the long‐held dream of hydrogen economy a reality. Although platinum (Pt)‐based catalysts show good performance toward hydrogen evolution reaction (HER), the high cost and scarce abundance challenge their economic viability and sustainability. Here, a non‐Pt, high‐performance electrocatalyst for HER achieved by engineering high fractions of stacking fault (SF) defects for MoNi4/MoO2 nanosheets (d‐MoNi) through a combined chemical and thermal reduction strategy is shown. The d‐MoNi catalyst offers ultralow overpotentials of 78 and 121 mV for HER at current densities of 500 and 1000 mA cm−2 in 1 M KOH, respectively. The defect‐rich d‐MoNi exhibits four times higher turnover frequency than the benchmark 20% Pt/C, together with its excellent durability (> 100 h), making it one of the best‐performing non‐Pt catalysts for HER. The experimental and theoretical results reveal that the abundant SFs in d‐MoNi induce a compressive strain, decreasing the proton adsorption energy and promoting the associated combination of *H into hydrogen and molecular hydrogen desorption, enhancing the HER performance. This work provides a new synthetic route to engineer defective metal and metal alloy electrocatalysts for emerging electrochemical energy conversion and storage applications.

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Stacking fault energy and electronic structure of molybdenum under solid solution softening/hardening

Cited by 8 publications

References 52 publications

Influence Mechanism of Magnetized Modified Kerosene on Flotation Behavior of Molybdenite

Influence Mechanism of Magnetized Modified Kerosene on Flotation Behavior of Molybdenite

Stacking Faults Defect-Rich MoNi Alloy for Ultrahigh-Performance Hydrogen Evolution

Stacking Fault‐Enriched MoNi₄/MoO₂ Enables High‐Performance Hydrogen Evolution

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Stacking fault energy and electronic structure of molybdenum under solid solution softening/hardening

Cited by 8 publications

References 52 publications

Influence Mechanism of Magnetized Modified Kerosene on Flotation Behavior of Molybdenite

Influence Mechanism of Magnetized Modified Kerosene on Flotation Behavior of Molybdenite

Stacking Faults Defect-Rich MoNi Alloy for Ultrahigh-Performance Hydrogen Evolution

Stacking Fault‐Enriched MoNi4/MoO2 Enables High‐Performance Hydrogen Evolution

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Stacking Fault‐Enriched MoNi₄/MoO₂ Enables High‐Performance Hydrogen Evolution