Exploiting finite size effects in a novel core/shell microstructure

Zhu, Liu; Xia, Guoqiang; Zhu, F. Q.; Kim, Su; Marković, Nina; Chien, C. L.; Searson, Peter C.

doi:10.1063/1.2844286

Cited by 37 publications

(50 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast, the passiviation that allows the "reverse" dealloying to occur should also hinder any significant atomic movement of the component that remains. In fact, this has been observed in the NiCu system, 2 International Journal of Electrochemistry where a phase-separated core-shell structure in the asdeposited film led to a tube-like morphology in the dealloyed material [18,30]. Thus, "reverse" dealloying of this type has the potential to produce a variety of final architectures based on the particular characteristics of the starting material.…”

Section: Introductionmentioning

confidence: 95%

Dealloying Behavior of NiCo and NiCoCu Thin Films

Peecher

Hampton

2016

International Journal of Electrochemistry

View full text Add to dashboard Cite

Porous metals and alloys, such as those fabricated via electrochemical dealloying, are of interest for a variety of energy applications, ranging from their potential for enhanced catalytic behavior to their use as high surface area supports for pseudocapacitor materials. Here, the electrochemical dealloying process was explored for electrodeposited binary NiCo and ternary NiCoCu thin films. For each of the four different metal ratios, films were dealloyed using linear sweep voltammetry to various potentials in order to gain insight into the evolution of the film over the course of the linear sweep. Electrochemical capacitance, scanning electron microscopy, and energy dispersive X-ray spectroscopy were used to examine the structure and composition of each sample before and after linear sweep voltammetry was performed. For NiCo films, dealloying resulted in almost no change in composition but did result in an increased capacitance, with greater increases occurring at higher linear sweep potentials, indicating the removal of material from the films. Dealloying also resulted in the appearance of large pores on the surface of the high nickel percentage NiCo films, while low nickel percentage NiCo films had little observable change in morphology. For NiCoCu films, Cu was almost completely removed at linear sweep potentials greater than 0.5 V versus Ag/AgCl. The linear sweep removed large Cu-rich dendrites from the films, while also causing increases in measured capacitance.

show abstract

Section: Introductionmentioning

confidence: 95%

Dealloying Behavior of NiCo and NiCoCu Thin Films

Peecher

Hampton

2016

International Journal of Electrochemistry

View full text Add to dashboard Cite

show abstract

“…Transmission Electron Microscopy (TEM) images of permalloy (Py = Ni 80 Fe 20 )/Cu and Co/Cu multilayered nanowires are shown in Figure 3d,e. Over the last decade, several groups also reported on the electrochemical synthesis of parallel arrays of Ni nanotubes within nanopores of anodic alumina oxide and polymer templates [42,44,71,72]. In this method, core-shell Cu/Ni nanocables are first grown in porous templates at a constant deposition potential, followed by the selective electrochemical etching of the Cu-rich core at an oxidation potential (see Figure 3f).…”

Section: Methodsmentioning

confidence: 99%

Magnetic Nanowires

Piraux

2020

Applied Sciences

View full text Add to dashboard Cite

Magnetic nanowires are attractive materials because of their morphology-dependent remarkable properties suitable for various advanced technologies in sensing, data storage, spintronics, biomedicine and microwave devices, etc. The recent advances in synthetic strategies and approaches for the fabrication of complex structures, such as parallel arrays and 3D networks of one-dimensional nanostructures, including nanowires, nanotubes, and multilayers, are presented. The simple template-assisted electrodeposition method enables the fabrication of different nanowire-based architectures with excellent control over geometrical features, morphology and chemical composition, leading to tunable magnetic, magneto-transport and thermoelectric properties. This review article summarizing the work carried out at UCLouvain focuses on the magnetic and spin-dependent transport properties linked to the material and geometrical characteristics.

show abstract

“…Moreover, Ni 2+ was reduced much slower than Cu 2+ , leading to the formation of low density large Cu islands during stages of reduction process. When the surface was reduced in Cu ions, Ni nucleation was promoted in the nearby areas of Cu islands [10,11]. Another reason could be due to the fact that Ni atoms segregate to form Ni-rich magnetic clusters, compared to the Cu-Ni solid solution, the free energy of the nickel-copper foams becomes lower [12,13].…”

Section: Structural and Morphological Characterization And Electrochemimentioning

confidence: 99%

NANOSTRUCTURED Ni-Cu FOAM ELECTRODEPOSITED ON A COPPER SUBSTRATE APPLIED AS SUPERCAPACITOR ELECTRODE

Mirzaee¹,

Dehghanian²

2018

Acta Metall Slovaca

View full text Add to dashboard Cite

The applicability of nickel-copper metallic foams as a current collector was investigated for supercapacitor. A comprehensive characterization of Ni-Cu based foam was studied and the analysis of their structural, chemical, and electrochemical properties was evaluated. Structural characteristics and electrochemical methods were used to examine the surface morphology, and surface-chemical composition of the materials. The foams deposited at the time deposition of 180s exhibited dual-porosities (macro and mesopores) with pores ranging from13 to16 μm and the branch size ranged from 25 to 50 nm. Ni-Cu foam electrodes are employed as current collector for supercapacitor. Their usefulness as current collector was evaluated by well-defined experimental conditions using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge and discharge (GCD) techniques. The outcome of these experiments demonstrated that the Ni-Cu foams which was synthesized at the time deposition of 180s had pseudocapacitive behavior. The best value for specific capacitance which was calculated from GCD was (536 F/g at 1 mA/cm2) for the Ni-Cu foams deposited at 2 A/cm2 for 180 s. The Ni-Cu foam sustained a current density of 15 mA/cm2 after 2000 cycles without significant loss of supercapacitor activity.

show abstract

Exploiting finite size effects in a novel core/shell microstructure

Cited by 37 publications

References 18 publications

Dealloying Behavior of NiCo and NiCoCu Thin Films

Dealloying Behavior of NiCo and NiCoCu Thin Films

Magnetic Nanowires

NANOSTRUCTURED Ni-Cu FOAM ELECTRODEPOSITED ON A COPPER SUBSTRATE APPLIED AS SUPERCAPACITOR ELECTRODE

Contact Info

Product

Resources

About