Controlled Growth of a Hierarchical Nickel Carbide “Dandelion” Nanostructure

Qiao, Liang; Zhao, Wenxia; Qin, Yueling; Swihart, Mark T.

doi:10.1002/anie.201603456

“…X‐ray diffraction (XRD) patterns showed the crystallographic structure of the produced particles ascribe to the rhombohedral Ni 3 C 1− x phase (JCPDS 01 072 1467, Figure 1 b). [28] High resolution TEM (HRTEM) characterization confirmed the crystal structure to the Ni 3 C hexagonal phase (space group=R3‐CH#167) with a = b =4.5820 Å and c =13.0300 Å.…”

Section: Figurementioning

confidence: 79%

Selective Methanol‐to‐Formate Electrocatalytic Conversion on Branched Nickel Carbide

Li

¹

,

Wei

²

,

Wang

³

et al. 2020

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A methanol economy will be favored by the availability of low‐cost catalysts able to selectively oxidize methanol to formate. This selective oxidation would allow extraction of the largest part of the fuel energy while concurrently producing a chemical with even higher commercial value than the fuel itself. Herein, we present a highly active methanol electrooxidation catalyst based on abundant elements and with an optimized structure to simultaneously maximize interaction with the electrolyte and mobility of charge carriers. In situ infrared spectroscopy combined with nuclear magnetic resonance spectroscopy showed that branched nickel carbide particles are the first catalyst determined to have nearly 100 % electrochemical conversion of methanol to formate without generating detectable CO2 as a byproduct. Electrochemical kinetics analysis revealed the optimized reaction conditions and the electrode delivered excellent activities. This work provides a straightforward and cost‐efficient way for the conversion of organic small molecules and the first direct evidence of a selective formate reaction pathway.

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“…X-ray diffraction (XRD) patterns showed the crystallographic structure of the produced particles ascribe to the rhombohedral Ni 3 C 1Àx phase (JCPDS 01 072 1467, Figure 1 b). [28] High resolution TEM (HRTEM) characterization confirmed the crystal structure to the Ni 3 C hexagonal phase (space group = R3-CH#167) with a = b = 4.5820 and c = 13.0300 .…”

mentioning

confidence: 80%

Selective Methanol‐to‐Formate Electrocatalytic Conversion on Branched Nickel Carbide

Li

¹

,

Wei

²

,

Wang

³

et al. 2020

View full text Add to dashboard Cite

A methanol economy will be favored by the availability of low‐cost catalysts able to selectively oxidize methanol to formate. This selective oxidation would allow extraction of the largest part of the fuel energy while concurrently producing a chemical with even higher commercial value than the fuel itself. Herein, we present a highly active methanol electrooxidation catalyst based on abundant elements and with an optimized structure to simultaneously maximize interaction with the electrolyte and mobility of charge carriers. In situ infrared spectroscopy combined with nuclear magnetic resonance spectroscopy showed that branched nickel carbide particles are the first catalyst determined to have nearly 100 % electrochemical conversion of methanol to formate without generating detectable CO2 as a byproduct. Electrochemical kinetics analysis revealed the optimized reaction conditions and the electrode delivered excellent activities. This work provides a straightforward and cost‐efficient way for the conversion of organic small molecules and the first direct evidence of a selective formate reaction pathway.

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“…Several hedges of breakthroughs are yet to be explored with the novel initiative of matrix reinforcement in composite technology for the development of excellent materials with a good combination of properties and superior performance in applications [1][2][3][4][5]. Over the years, success rates recorded in materials' usage especially in aerospace and automobile are still left with a huge vacuum to be filled with novel functional materials having cutting-edge innovations and sustainable performance to meet up with the current needs of the industries [6,7]. Generally, composites synergize the strengths of their components and eliminate their shortcomings to produce materials that fit the requirements for structures or applications that are especially exposed to extreme environments in terms of temperature, fluid, stress, and fatigue [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…To the best of the knowledge of the authors, no work has been reported on TiNi-CSP MMCs using the SPS powder metallurgy technique. In studies, expensive advanced ceramic compounds such as ZrO2, TiN, SiB6, TiB2, B4C, SiO2, and CNT have been widely applied as metal matrix reinforcements, which makes the application of MMCs to be limited [7,28,30,31]. It is noteworthy that besides the cost of production, some advanced ceramics can be highly toxic in high concentrations.…”

Section: Introductionmentioning

confidence: 99%

Influence of coconut shell powder organic reinforcement on chemical, microstructural and mechanical properties of spark plasma sintered Ti-Ni based metal matrix composite

Odetola

¹

,

Popoola

²

,

Ajenifuja

³

2020

J Met Mater Miner

2

0

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Metal matrix composites (MMCs) are currently used in place of pure alloys and polymer matrix composites because of their unique physical properties. Titanium and nickel powders were alloyed with coconut shell powder (CSP) as organic compound reinforcement to form a TiNi-based metal matrix composite (MMC) using spark plasma sintering (SPS) technique. The powders were mild-milled for 16 h and then axially consolidated at 850°C, heating rate of 100°C.min-1 and 50 MPa sintering pressure. Characterizations were done using field emission scanning electron microscope (FE-SEM-EDX) and x-ray diffractometer (XRD). Elemental and structural characterizations of the composites revealed the formation of the Ti-rich eutectic phase, Ni-rich dendrites, and TiNi-rich phase regions with dispersed distributions of carbides and oxide phases within the system. The Ni-rich “islands” appear to be depleted with increased CSP content. However, the relative density, tensile strength and microhardness improved in samples with higher amounts of CSP powder to the optimum values of 99.9%, 1022.91 MPa and 319.71 HV.

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Controlled Growth of a Hierarchical Nickel Carbide “Dandelion” Nanostructure

Cited by 12 publications

References 20 publications

Selective Methanol‐to‐Formate Electrocatalytic Conversion on Branched Nickel Carbide

Selective Methanol‐to‐Formate Electrocatalytic Conversion on Branched Nickel Carbide

Selective Methanol‐to‐Formate Electrocatalytic Conversion on Branched Nickel Carbide

Influence of coconut shell powder organic reinforcement on chemical, microstructural and mechanical properties of spark plasma sintered Ti-Ni based metal matrix composite

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