The hexagonal close-packed nickel nanocrystals prepared by fast scan voltammetry

M.A.Tehrani, Ramin; Ghani, Sulaiman Ab

doi:10.1016/j.jcis.2009.07.042

Cited by 12 publications

(5 citation statements)

References 71 publications

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“…5. 22 Ni → Ni 2+ + 2e − [5] Notably, the onset potential of the electrodeposition is shift to more positive after introducing TU into the electrolyte containing NiCl 2 alone. This phenomenon mainly resulted from the depolariztion effect.…”

Section: Resultsmentioning

confidence: 99%

Cathodic Deposition of Flaky Nickel Sulfide Nanostructure as an Electroactive Material for High-Performance Supercapacitors

Chou

Lin

2013

J. Electrochem. Soc.

207

133

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In this current work, a flaky nickel sulfide (Ni3S2) nanostructure was deposited on a Ni foam substrate using a facile potentiodynamic deposition approach and investigated as an electroactive material for high-performance supercapacitor for the first time. X-ray diffraction, scanning electron microscopy and transmission electron microscopy confirmed that the as-prepared Ni3S2 nanostructure was assembled from intercrossing nanoflakes, thus facilitating the electrolyte penetration. The flaky Ni3S2 nanostructure showed a high specific capacitance as well as 717 F g−1 at 2 A g−1, and a remarkable rate capability, in which a promising specific capacitance of 411 F g−1 can still be delivered at 32 A g−1. Moreover, the flaky Ni3S2 nanostructure demonstrated an impressive excellent cycling performance that ∼91% of retention in the specific capacitance can still be made after cycling of 500–1000 consecutive charge/discharge tests at a relatively high current density of 4 A g−1. As a result, the flaky Ni3S2 nanostructure can be considered as a promising electroactive material for high-performance SCs.

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Section: Resultsmentioning

confidence: 99%

Cathodic Deposition of Flaky Nickel Sulfide Nanostructure as an Electroactive Material for High-Performance Supercapacitors

Chou

Lin

2013

J. Electrochem. Soc.

207

133

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“…The typical XRD patterns of all the samples are presented in Figure . Generally, both nickel and cobalt have more than one crystal structure; the most common ones are face centered-cubic (fcc) and hexagonal close-packed (hcp) phases . The equilibrium phase of nonalloy nickel has an fcc structure.…”

Section: Resultsmentioning

confidence: 99%

“…Generally, both nickel and cobalt have more than one crystal structure, the most common ones are face centered-cubic (FCC) and hexagonal close-packed (HCP) phases. 19 The equilibrium phase of non-alloy nickel has an FCC structure, the HCP nickel, which is thermally less stable than FCC nickel, is considered to be a meta-stable phase which may be observed only under specific conditions. 20,21 While the two phases of cobalt usually coexist at room temperature and are often difficult to be separated from each other.…”

Section: Physical Characterization Of Ni M Co N Catalystsmentioning

confidence: 99%

Promoting Effect of Co in Ni_mCo_n (m + n = 4) Bimetallic Electrocatalysts for Methanol Oxidation Reaction

Cui¹,

Guo²,

Zhou³

et al. 2014

ACS Appl. Mater. Interfaces

149

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Ni-based bimetallic alloys have superior physiochemical characteristics compared to monometallic Ni. In this study, a new type of low cost bimetallic NimCon (n + m = 4) electrocatalysts with high active surface were synthesized on Ti substrate through a hydrogen evolution assisted electrodeposition method. The as-prepared NimCon were characterized by XRD, EDS, and SEM. It was revealed that the composition, surface morphology, as well as the crystal phase structure of the bimetallic NimCon electrocatalysts were significantly changed with the increased content of cobalt. Electrochemical measurements showed that the bimetallic NimCon catalysts, compared with the monometallic Ni, have superior catalytic activity and stability toward the methanol electrooxidation reaction. Additionally, Ni2Co2 sample presented the highest oxidation current density and the best durability. The mechanism study based on electrochemical experiments and density functional theory based calculations showed that the doping of Co in NimCon can signally improve the surface coverage of the redox species, weaken the CO adsorption, as well as adjust the CH3OH adsorption. Such understanding is of important directive significance to design efficient nonprecious catalysts.

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“…Bond distance of nickel fcc nanocrystals is 2.499 Å, while that of nickel hcp nanocrystals is 2.665 Å. The increases in bond distance from fcc nanocrystal to hcp nanocrystal contribute to the difference in magnetic properties [126,127]. Fe exhibits higher catalytic activity on {111} crystal plane in ammonia synthesis system, but {100} crystal plane in nitrite reduction system has higher catalytic activity [128,129].…”

Section: Attempt Of Base Metal Nanocrystal Synthesismentioning

confidence: 99%

“…The graphite substrate played a key role during the kinetically-controlled electrochemical deposition process for stability of the hcp structured nickel nanocrystals. [127].…”

Section: Attempt Of Base Metal Nanocrystal Synthesismentioning

confidence: 99%

Synthesis of Metallic Nanocrystals: From Noble Metals to Base Metals

et al. 2019

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Metallic nanocrystals exhibit superior properties to their bulk counterparts because of the reduced sizes, diverse morphologies, and controllable exposed crystal facets. Therefore, the fabrication of metal nanocrystals and the adjustment of their properties for different applications have attracted wide attention. One of the typical examples is the fabrication of nanocrystals encased with high-index facets, and research on their magnified catalytic activities and selections. Great accomplishment has been achieved within the field of noble metals such as Pd, Pt, Ag, and Au. However, it remains challenging in the fabrication of base metal nanocrystals such as Ni, Cu, and Co with various structures, shapes, and sizes. In this paper, the synthesis of metal nanocrystals is reviewed. An introduction is briefly given to the metal nanocrystals and the importance of synthesis, and then commonly used synthesis methods for metallic nanocrystals are summarized, followed by specific examples of metal nanocrystals including noble metals, alloys, and base metals. The synthesis of base metal nanocrystals is far from satisfactory compared to the tremendous success achieved in noble metals. Afterwards, we present a discussion on specific synthesis methods suitable for base metals, including seed-mediated growth, ligand control, oriented attachment, chemical etching, and Oswald ripening, based on the comprehensive consideration of thermodynamics, kinetics, and physical restrictions. At the end, conclusions are drawn through the prospect of the future development direction.

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The hexagonal close-packed nickel nanocrystals prepared by fast scan voltammetry

Cited by 12 publications

References 71 publications

Cathodic Deposition of Flaky Nickel Sulfide Nanostructure as an Electroactive Material for High-Performance Supercapacitors

Cathodic Deposition of Flaky Nickel Sulfide Nanostructure as an Electroactive Material for High-Performance Supercapacitors

Promoting Effect of Co in Ni_mCo_n (m + n = 4) Bimetallic Electrocatalysts for Methanol Oxidation Reaction

Synthesis of Metallic Nanocrystals: From Noble Metals to Base Metals

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The hexagonal close-packed nickel nanocrystals prepared by fast scan voltammetry

Cited by 12 publications

References 71 publications

Cathodic Deposition of Flaky Nickel Sulfide Nanostructure as an Electroactive Material for High-Performance Supercapacitors

Cathodic Deposition of Flaky Nickel Sulfide Nanostructure as an Electroactive Material for High-Performance Supercapacitors

Promoting Effect of Co in NimCon (m + n = 4) Bimetallic Electrocatalysts for Methanol Oxidation Reaction

Synthesis of Metallic Nanocrystals: From Noble Metals to Base Metals

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Promoting Effect of Co in Ni_mCo_n (m + n = 4) Bimetallic Electrocatalysts for Methanol Oxidation Reaction