A segmental dealloying for fabricating the gradient nanoporous metal materials

Lian, Lixian; Yao, Yanfei; Liu, Ying; Fang, X M

doi:10.1007/s10934-016-0254-4

Cited by 6 publications

(9 citation statements)

References 21 publications

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“…Considering the respective potential shift for hydrogen evolution at pH 1 and pH 14, the electrochemical Zn oxidation is thermodynamically favored in acidic environment than that in alkaline. For the dealloying experiments, electrolytes of 0.1 M for HCl and 1.3 M for NaOH were chosen to compare our results with those in the literature. ,, Apart from the comparability, the ionic strength of the solutions is strong enough to entirely dissolve the Zn from the alloyed film in a proper dealloying time.…”

Section: Resultsmentioning

confidence: 99%

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Ligament Evolution in Nanoporous Cu Films Prepared by Dealloying

2018

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A facile synthetic route to form nanoporous (np) metallic materials is the (electro)chemical dissolution of less noble metals from an alloy referred to as dealloying. In this study, we investigated the dynamic formation of np copper (np-Cu) films prepared from Zn–Cu alloys. The obtained np-Cu films were characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, grazing-incidence X-ray diffraction, and X-ray photoelectron spectroscopy depth profiles. We show a clear correlation between the dealloying conditions [reaction time and electrolyte solution (0.1 M HCl (pH 1) and 1.3 M NaOH (pH 14))] and structural parameters (ligament size and chemical composition) for the np-Cu films. The dealloying process in 0.1 M HCl results in the formation of uniform ligaments in the np-Cu. However, the ligament size grows with decreasing Zn content, signifying a strong relation between Zn content and the ligament size. In contrast, dealloying in NaOH leads to ligament structures which are independent of the Zn content. This observation is likely based on the reduced surface mobility of the Cu (hydr)oxide species and the completive reaction like redeposition of soluble Cu(I) species to form Cu(I) oxide crystals. This knowledge enables the development of synthetic guidelines for the preparation of tunable ligament size and content of less noble metal, which is highly critical for systematic studies.

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Section: Resultsmentioning

confidence: 99%

“…For the dealloying experiments, electrolytes of 0.1 M for HCl and 1.3 M for NaOH were chosen to compare our results with those in the literature. 13,26,27 Apart from the comparability, the ionic strength of the solutions is strong enough to entirely dissolve the Zn from the alloyed film in a proper dealloying time.…”

Section: Resultsmentioning

confidence: 99%

Ligament Evolution in Nanoporous Cu Films Prepared by Dealloying

2018

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“…Thereby, the ribbons were dealloyed in 0.1 M HCl and 1.3 M NaOH for different reaction times (3.5, 8, 24, 48, 72, 92, 168, and 312 h) under free corrosion. We chose 0.1 M HCl and 1.3 M NaOH as electrolyte solutions to compare our results with previous work on np-Cu films and other research works. ,, Throughout this paper, we will denote the multiple np-Cu samples dealloyed at different electrolytes for different dealloying times as follows: np-Cu (electrolyte, time).…”

Section: Resultsmentioning

confidence: 99%

“…We chose 0.1 M HCl and 1.3 M NaOH as electrolyte solutions to compare our results with previous work on np-Cu films 17 and other research works. 31,45,46 Throughout this paper, we will denote the multiple np-Cu samples dealloyed at different electrolytes for different dealloying times as follows: np-Cu (electrolyte, time).…”

Section: Characterization Of Pristine Zn 80 Cu 20 Alloymentioning

confidence: 99%

Nanoporous Copper Ribbons Prepared by Chemical Dealloying of a Melt-Spun ZnCu Alloy

et al. 2021

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Dealloying is a powerful and versatile method to fabricate threedimensional nanoporous (np) materials with high surface area. In this work, we investigated the dealloying processes of Zn 80 Cu 20 alloy ribbons in acidic and alkaline environments. Our results show that the nanostructure can be controlled by varying the nature of electrolyte solution, pH value, dealloying time, and temperature. In acidic media, the presence of chloride ions enhances the Cu surface mobility, leading to a faster coarsening and growth of ligaments during the dealloying process over time. In contrast, the surface diffusivity of Cu atoms in alkaline media is three orders lower than that in acid and results in a remarkably smaller ligament size due to the formation of Cu (hydr)oxide surface species. Cross-section analysis indicates that the dealloying process is largely controlled by interfacial processes. Interestingly, local Zn-rich regions were found near the surface in np-Cu ribbons dealloyed in 0.1 M HCl. This comprehensive study shows the influence of dealloying conditions on the morphology and residual Zn content of np-Cu ribbons as a model system for fabricating bicontinuous ligament-pore network materials with tailored structural and chemical properties for applications in electrochemical synthesis, sensors, and catalysis.

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“…Recent research has demonstrated that the introduction of a gradient porous structure can effectively address the limitations of a homogeneous material structure performance [21][22][23]. This structure exhibits a porosity gradient distributed in a specific direction, enabling the targeted control of material structure to meet specific requirements.…”

Section: Introductionmentioning

confidence: 99%

The Integrated Preparation of Porous Tungsten Gradient Materials with a Wide Porosity Range

Zhu,

Jia,

Huang

et al. 2024

Metals

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Porous tungsten gradient materials with ordered gradient variations in pore size have significant application value in the field of vacuum electronic devices. This work combines tape casting and dealloying methods to achieve the integrated preparation of porous tungsten gradient materials with a wide range of controllable porosity. The study focused on the phase composition and microstructure evolution during the preparation of porous tungsten gradient materials. The results show that the tape casting process allows for the precise and controllable thickness of each layer of the porous tungsten materials and uniform composition structure, while the stepwise dealloying of Fe and Ti enables a wide range of controllable porosity for the porous tungsten gradient materials. PVB, after thermal decomposition, provides a carbon source for the in situ reaction to form W-Fe-C compounds, and the surface diffusion behavior of W-Fe-C compounds at high temperatures improves the stratification of the porous tungsten gradient materials. This work provides a design concept for the integrated preparation of porous metal gradient materials.

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A segmental dealloying for fabricating the gradient nanoporous metal materials

Cited by 6 publications

References 21 publications

Ligament Evolution in Nanoporous Cu Films Prepared by Dealloying

Ligament Evolution in Nanoporous Cu Films Prepared by Dealloying

Nanoporous Copper Ribbons Prepared by Chemical Dealloying of a Melt-Spun ZnCu Alloy

The Integrated Preparation of Porous Tungsten Gradient Materials with a Wide Porosity Range

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