Modification of surface activity of Cu-based amorphous alloys by chemical processes of metal degradation

Janik‐Czachor, M.; Szummer, A.; Bukowska, J.; Molnár, Árpàd; Mack, P.; Filipek, S.M.; Kędzierzawski, P.; Kudelski, Andrzej; Pisarek, Marcin; Dolata, M.; Varga, Mónika

doi:10.1016/s0926-860x(02)00260-0

Cited by 24 publications

(18 citation statements)

References 38 publications

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“…These outstanding features are attributed to their chemically and structurally homogeneous nature [5,6]. Moreover, chemical compositions of the amorphous alloys are not limited by solubility limits in comparison with the crystalline materials.…”

Section: Introductionmentioning

confidence: 99%

Microstructural characterization of rapidly solidified Cu 50 Zr 40 Ni 5 Ti 5 amorphous alloy

Kursun

Göğebakan

2015

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Microstructural characterization of rapidly solidified Cu 50 Zr 40 Ni 5 Ti 5 amorphous alloy

Kursun

Göğebakan

2015

Journal of Alloys and Compounds

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“…In addition, it is noticed that surface chemical segregation has a significant effect on surface activity, and is critical for degradation performance. In fact, surface segregation has been widely investigated for various alloys, especially bimetallic nanoparticles, applied in the field of catalyst engineering 43 44 . For example, Janik-Czachor et al .…”

Section: Discussionmentioning

confidence: 99%

“…For example, Janik-Czachor et al . modified the surface activity of Cu-based amorphous alloys by making a selective surface segregation of Cu with chemical processes, leading to a substantial increase in the catalytic efficiency of dehydrogenation of aliphatic alcohols 43 . In our case, however, surface chemical segregation of the as-milled HEA powders should be subtle due to the fact that mechanical alloying is capable for homogenizing chemical elements 23 .…”

Section: Discussionmentioning

confidence: 99%

Development of a novel high-entropy alloy with eminent efficiency of degrading azo dye solutions

Liu

Jia

et al. 2016

Sci Rep

131

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In addition to its scientific importance, the degradation of azo dyes is of practical significance from the perspective of environmental protection. Although encouraging progress has been made on developing degradation approaches and materials, it is still challenging to fully resolve this long-standing problem. Herein, we report that high entropy alloys, which have been emerging as a new class of metallic materials in the last decade, have excellent performance in degradation of azo dyes. In particular, the newly developed AlCoCrTiZn high-entropy alloy synthesized by mechanical alloying exhibits a prominent efficiency in degradation of the azo dye (Direct Blue 6: DB6), as high as that of the best metallic glass reported so far. The newly developed AlCoCrTiZn HEA powder has low activation energy barrier, i.e., 30 kJ/mol, for the degrading reaction and thus make the occurrence of reaction easier as compared with other materials such as the glassy Fe-based powders. The excellent capability of our high-entropy alloys in degrading azo dye is attributed to their unique atomic structure with severe lattice distortion, chemical composition effect, residual stress and high specific surface area. Our findings have important implications in developing novel high-entropy alloys for functional applications as catalyst materials.

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“…Various electrochemical methods were also found to be effective [20,[22][23][24]; these included anodic rapid dissolution, non-equilibrium cathodic deposition, anodic activation, and cathodic hydrogen charging. The latter pretreatment performed at i = −1 mA cm −2 in 0.1 M NaOH when applied for Cu 61 Hf 39 and Cu 65 Hf 35 alloys, was equally effective as in-situ activation [23,24].…”

Section: Dehydrogenation Over Cu − M (Ti Zr or Hf) Catalystsmentioning

confidence: 99%

Metallic Glasses

Baiker

Molnár²

2008

Handbook of Heterogeneous Catalysis

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The sections in this article are Introduction Preparation Chemical and Structural Properties Metallic Glasses in Catalysis Research Research into Metallic Glasses in As‐Quenched State Metallic Glasses as Precursors to Catalytically Active Materials Factors Influencing Chemical and Structural Properties of Catalytic Materials Derived from Metallic Glasses Chemical Composition Chemical and Structural Homogeneity Thermal Stability and Crystallization Behavior Oxidation Behavior Dissolution of Gases Segregation Phenomena Case Studies CO Oxidation Catalysts Prepared from Metallic Glasses Pd / ZrO 2 Catalysts from Amorphous Pd  Zr Alloys Promoted Au  Zr Catalysts from Ternary Au ‐Containing Glassy Alloys Methanation over Ni Alloys Dehydrogenation over Cu  M ( Ti , Zr or Hf ) Catalysts Conclusions and Outlook

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Modification of surface activity of Cu-based amorphous alloys by chemical processes of metal degradation

Cited by 24 publications

References 38 publications

Microstructural characterization of rapidly solidified Cu 50 Zr 40 Ni 5 Ti 5 amorphous alloy

Microstructural characterization of rapidly solidified Cu 50 Zr 40 Ni 5 Ti 5 amorphous alloy

Development of a novel high-entropy alloy with eminent efficiency of degrading azo dye solutions

Metallic Glasses

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