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

A novel and simple method has been developed to prepare the Cu-Si composite as anode material for lithium-ion batteries. Nanoporous Cu-Si composite with pore sizes of 1~30 nm was prepared by dealloying the melt-spun Al-Cu-Si-Ce ribbons in a 5 wt.% HCl solution. Electrochemical tests revealed that the nanoporous Cu-Si electrodes exhibited highly reversible capacity of 2317 mAhg-1 and retained a capacity of 1030 mAhg-1 over 20 cycles. The excellent electrochemical performance is attributed to the unique porous structure of the Cu-Si composite. Our results demonstrate that this novel composite is a promising anode candidate for high-capacity rechargeable lithium-ion batteries.

Download Full-text

Fabrication of Nanoporous Copper Ribbons through Dealloying of Al-Cu-Mn Alloys

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.636.111 ◽

2014 ◽

Vol 636 ◽

pp. 111-114

Author(s):

Hua Wei Jiang ◽

Jie Zhang ◽

Mei Li ◽

Hao Ran Geng ◽

Min Zuo

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Channel Structure ◽

Porous Structures ◽

X Ray Diffraction ◽

X Ray ◽

Nanoporous Copper ◽

Melt Spun ◽

Aggregation Phenomenon ◽

Scanning Electron

We present a new Al-Cu-Mn system to fabricate nanoporous copper ribbons by dealloying. The microstructures of the nanoporous copper ribbons are characterized using X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis. The results show that the compositions of the melt-spun Al-Cu-Mn alloys have an important effect on the dealloying process and microstructures of the nanoporous copper ribbons. The melt-spun Cu30Al40Mn30, Cu30Al35Mn35, Cu30Al30Mn40 and Cu30Al25Mn45 (at.%) alloys can completely form a bicontinuous interpenetrating ligament-channel structure. Compared with other alloys, the dealloying of Cu30Al40Mn30 alloys is more difficult. In addition, for Cu30Al35Mn35 and Cu30Al30Mn40 alloys, porous structures are relatively uniform. But for the Cu30Al25Mn45 alloys, porous structure is not uniform, occurring aggregation phenomenon.

Download Full-text

A facile one-pot dealloying strategy to synthesize monolithic asymmetry-patterned nanoporous copper ribbons with tunable microstructure and nanoporosity

RSC Advances ◽

10.1039/c5ra22978b ◽

2016 ◽

Vol 6 (4) ◽

pp. 2662-2670 ◽

Cited By ~ 8

Author(s):

Wenbo Liu ◽

Chenglai Xin ◽

Long Chen ◽

Jiazhen Yan ◽

Ning Li ◽

...

Keyword(s):

One Pot ◽

Cu Alloy ◽

Nanoporous Copper ◽

Melt Spun

In the present work, an effective and facile one-pot dealloying strategy has been developed to synthesize monolithic asymmetry-patterned nanoporous copper ribbons (AP-NPCRs) from melt-spun bi-phase Al 32 at% Cu alloy with trace α-Al.

Download Full-text

Microstructural Variations in Melt-Spun Rapidly Solidified Ribbons

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100117340 ◽

1985 ◽

Vol 43 ◽

pp. 54-55

Author(s):

L. A. Bendersky ◽

W. J. Boettinger

Keyword(s):

Solid State ◽

Processing Parameters ◽

Heat Extraction ◽

Solid State Reactions ◽

Careful Examination ◽

Ion Milling ◽

Melt Spun ◽

Wheel Side ◽

Rapidly Solidified ◽

Heat Extraction Rate

Rapid solidification produces a wide variety of sub-micron scale microstructure. Generally, the microstructure depends on the imposed melt undercooling and heat extraction rate. The microstructure can vary strongly not only due to processing parameters changes but also during the process itself, as a result of recalescence. Hence, careful examination of different locations in rapidly solidified products should be performed. Additionally, post-solidification solid-state reactions can alter the microstructure.The objective of the present work is to demonstrate the strong microstructural changes in different regions of melt-spun ribbon for three different alloys. The locations of the analyzed structures were near the wheel side (W) and near the center (C) of the ribbons. The TEM specimens were prepared by selective electropolishing or ion milling.

Download Full-text

Spherulite Structures in a Melt Spun Fe-Ni Austenitic Steel

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100117339 ◽

1985 ◽

Vol 43 ◽

pp. 52-53

Author(s):

G. M. Michal ◽

T. K. Glasgow ◽

T. J. Moore

Keyword(s):

Austenitic Steel ◽

Room Temperature ◽

Elevated Temperatures ◽

Large Range ◽

Amorphous Structure ◽

Nucleation And Growth ◽

Ni Alloys ◽

Melt Spun ◽

Crystal Fibers ◽

Rapidly Solidified

Large additions of B to Fe-Ni alloys can lead to the formation of an amorphous structure, if the alloy is rapidly cooled from the liquid state to room temperature. Isothermal aging of such structures at elevated temperatures causes crystallization to occur. Commonly such crystallization pro ceeds by the nucleation and growth of spherulites which are spherical crystalline bodies of radiating crystal fibers. Spherulite features were found in the present study in a rapidly solidified alloy that was fully crysstalline as-cast. This alloy was part of a program to develop an austenitic steel for elevated temperature applications by strengthening it with TiB2. The alloy contained a relatively large percentage of B, not to induce an amorphous structure, but only as a consequence of trying to obtain a large volume fracture of TiB2 in the completely processed alloy. The observation of spherulitic features in this alloy is described herein. Utilization of the large range of useful magnifications obtainable in a modern TEM, when a suitably thinned foil is available, was a key element in this analysis.

Download Full-text

INFLUENCE OF RAPID QUENCHING AND SAMPLE TREATMENT ON THE STRUCTURE OF MELT SPUN Al-Si ALLOYS

Le Journal de Physique Colloques ◽

10.1051/jphyscol:1985884 ◽

1985 ◽

Vol 46 (C8) ◽

pp. C8-533-C8-537

Author(s):

J. Chevrier ◽

P. Sainfort ◽

P. Germi ◽

D. Pavuna

Keyword(s):

Rapid Quenching ◽

Sample Treatment ◽

Melt Spun

Download Full-text

MAGNETIZATION PROCESSES IN MELT SPUN NdFeB-MAGNETS

Le Journal de Physique Colloques ◽

10.1051/jphyscol:19888297 ◽

1988 ◽

Vol 49 (C8) ◽

pp. C8-655-C8-656 ◽

Cited By ~ 1

Author(s):

A. Handstein ◽

J. Schneider ◽

U. Heinecke ◽

R. Grössinger ◽

H. Sassik

Keyword(s):

Ndfeb Magnets ◽

Melt Spun ◽

Magnetization Processes

Download Full-text

Rapidly Solidified Melt-spun Bi-Sn Ribbons: Surface Composition Issues

JOURNAL OF ADVANCES IN PHYSICS ◽

10.24297/jap.v11i5.369 ◽

2016 ◽

pp. 3287-3297

Author(s):

Tarek El Ashram ◽

Ana P. Carapeto ◽

Ana M. Botelho do Rego

Keyword(s):

Chemical Composition ◽

Optical Microscopy ◽

Melt Spinning ◽

Surface Composition ◽

Electrochemical Process ◽

Melt Spun ◽

Bismuth Alloy ◽

The One ◽

Rapidly Solidified ◽

Melt Spinning Technique

Tin-bismuth alloy ribbons were produced using melt-spinning technique. The two main surfaces (in contact with the rotating wheel and exposed to the air) were characterized with Optical Microscopy and AFM, revealing that the surface exposed to the air is duller (due to a long-range heterogeneity) than the opposite surface. Also the XPS chemical composition revealed many differences between them both on the corrosion extension and on the total relative amounts of tin and bismuth. For instance, for the specific case of an alloy with a composition Bi-4 wt % Sn, the XPS atomic ratios Sn/Bi are 1.1 and 3.7 for the surface in contact with the rotating wheel and for the one exposed to air, respectively, showing, additionally, that a large segregation of tin at the surface exists (nominal ratio should be 0.073). This segregation was interpreted as the result of the electrochemical process yielding the corrosion products.

Download Full-text