Toward expanding the realm of high entropy materials to platinum group metals: A review

Moghaddam, Ahmad Ostovari; Trofimov, Evgeny

doi:10.1016/j.jallcom.2020.156838

Cited by 62 publications

(30 citation statements)

References 160 publications

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“…The multi-phase structure of Bio-HEAs still mainly uses a single-phase or a double phase as the dominant phase and the rest of the phases as the precipitating phases, which play a role in regulating the strength and ductility of Bio-HEAs. To date, there have been many studies on reconciling the strength and ductility of HEAs, including inducing transformation-induced plasticity (TRIP) by stressing ( Radi et al, 2022 ), and creating specially tailored eutectic structures ( Ostovari Moghaddam and Trofimov, 2021 ), introducing interstitially ordered oxygen complexes, and producing nanoscale precipitates or lamellar structures.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Bio-high entropy alloys: Progress, challenges, and opportunities

Feng

Tang

Liu

et al. 2022

Front. Bioeng. Biotechnol.

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With the continuous progress and development in biomedicine, metallic biomedical materials have attracted significant attention from researchers. Due to the low compatibility of traditional metal implant materials with the human body, it is urgent to develop new biomaterials with excellent mechanical properties and appropriate biocompatibility to solve the adverse reactions caused by long-term implantation. High entropy alloys (HEAs) are nearly equimolar alloys of five or more elements, with huge compositional design space and excellent mechanical properties. In contrast, biological high-entropy alloys (Bio-HEAs) are expected to be a new bio-alloy for biomedicine due to their excellent biocompatibility and tunable mechanical properties. This review summarizes the composition system of Bio-HEAs in recent years, introduces their biocompatibility and mechanical properties of human bone adaptation, and finally puts forward the following suggestions for the development direction of Bio-HEAs: to improve the theory and simulation studies of Bio-HEAs composition design, to quantify the influence of composition, process, post-treatment on the performance of Bio-HEAs, to focus on the loss of Bio-HEAs under actual service conditions, and it is hoped that the clinical application of the new medical alloy Bio-HEAs can be realized as soon as possible.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Bio-high entropy alloys: Progress, challenges, and opportunities

Feng

Tang

Liu

et al. 2022

Front. Bioeng. Biotechnol.

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“…Furthermore, the introduction of narrowbandgap SnS 2 and surface defects can significantly enhance visible light absorption. As reported in previous studies, sulfidation can achieve sulfur doping of C 3 N 4 and a controllable conversion of metal oxide to the corresponding metal sulfide, which can greatly influence the crystal phase component, surface state, and photocatalytic activity of the final products [65,66]. These favorable factors enable more electrons to react with the adsorbed CO 2 molecules, thus promoting the CO 2 photoreduction performance of S-C 3 N 4 /SnO 2 -SnS 2 .…”

Section: Articles Science China Materialsmentioning

confidence: 72%

Boosted charge transfer and photocatalytic CO2 reduction over sulfur-doped C3N4 porous nanosheets with embedded SnS2-SnO2 nanojunctions

Chen

Liu

et al. 2021

Sci. China Mater.

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Two-dimensional porous nanosheet heterostructure materials, which combine the advantages of both architecture and components, are expected to feature a significant photocatalytic performance toward CO 2 conversion into useful fuels. Herein, we provide a facile strategy for fabricating sulfur-doped C 3 N 4 porous nanosheets with embedded SnO 2 -SnS 2 nanojunctions (S-C 3 N 4 /SnO 2 -SnS 2 ) via liquid impregnation-pyrolysis and subsequent sulfidation treatment using a layered supramolecular structure as the precursor of C 3 N 4 . A hexagonal layered supramolecular structure was first prepared as the precursor of C 3 N 4 . Then Sn 4+ ions were intercalated into the supramolecular interlayers through the liquid impregnation method. The subsequent annealing treatment in air simultaneously realized the fabrication and efficient exfoliation of layered C 3 N 4 porous nanosheets. Moreover, SnO 2 nanoparticles were formed and embedded in situ in the porous C 3 N 4 nanosheets. In the following sulfidation process under a nitrogen atmosphere, sulfur powder can react with SnO 2 nanoparticles to form SnO 2 -SnS 2 nanojunctions. As expected, the exfoliation of sulfur-doped C 3 N 4 porous nanosheets and ternary heterostructure construction could be simultaneously achieved in this work. Sulfur-doped C 3 N 4 porous nanosheets with embedded SnO 2 -SnS 2 nanojunctions featured abundant active sites, enhanced visible light absorption, and efficient interfacial charge transfer. As expected, the optimized S-C 3 N 4 /SnO 2 -SnS 2 achieved a much higher gas-phase photocatalytic CO 2 reduction performance with high yields of CO (21.68 µmol g −1 h −1 ) and CH 4 (22.09 µmol g −1 h −1 ) compared with the control C 3 N 4 , C 3 N 4 / SnO 2 , and S-C 3 N 4 /SnS 2 photocatalysts. The selectivity of CH 4 reached 80.30%. Such a promising synthetic strategy can be expected to inspire the design of other robust C 3 N 4 -based porous nanosheet heterostructures for a broad range of applications. Keywords: sulfur-doped C 3 N 4 , porous nanosheets, SnO 2 -SnS 2 nanojunctions, tunable composition, CO

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“…All binary alloys of noble metals (Rh, Ir, Pd, and Pt) with 1:1 composition form fcc [40,41]. Furthermore, many noble metal HEAs (e.g., PdPtRhIrCuNi and PdPtRhRuCe) are reported to be fcc alloys [39,42]. Therefore, the fcc FeRhIrPdPt would be deeply related to the existing phase diagrams of noble metals.…”

Section: Resultsmentioning

confidence: 99%

Magnetic and Transport Properties of New Dual-Phase High-Entropy Alloy FeRhIrPdPt

et al. 2021

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High-entropy alloys (HEAs) are broadly explored from the perspective of mechanical, corrosion-resistance, catalytic, structural, superconducting, magnetic properties, and so on. In magnetic HEAs, 3d transition metals or rare-earth elements are well-studied compositional elements. We researched a magnetic HEA containing Fe combined with 4d and 5d transition metals, which has not been well investigated, and found a new dual-phase face-centered-cubic (fcc) HEA FeRhIrPdPt. The structural, magnetic, and transport properties were evaluated by assuming that FeRhIrPdPt is a mixture of FeRh4, FeIr4, FePd4, and FePt4, all with the fcc structure. The dual-phase is composed of a Rh- and Ir-rich main phase and a Pd- and Pt-rich minor one. FeRh4 and FeIr4 show spin freezings at low temperatures, while FePd4 and FePt4 are ferromagnetic. Two magnetic features can characterize FeRhIrPdPt. One is the canonical spin-glass transition at 90 K, and the other is a ferromagnetic correlation that appears below 300 K. The main and minor phases were responsible for the spin-glass transition and the ferromagnetic correlation below 300 K, respectively.

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Toward expanding the realm of high entropy materials to platinum group metals: A review

Cited by 62 publications

References 160 publications

Bio-high entropy alloys: Progress, challenges, and opportunities

Bio-high entropy alloys: Progress, challenges, and opportunities

Boosted charge transfer and photocatalytic CO2 reduction over sulfur-doped C3N4 porous nanosheets with embedded SnS2-SnO2 nanojunctions

Magnetic and Transport Properties of New Dual-Phase High-Entropy Alloy FeRhIrPdPt

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