Nickel nanoparticles supported on nitrogen-doped honeycomb-like carbon frameworks for effective methanol oxidation

Wang, Juan; Zhao, Qi; Hou, Hongshuai; Wu, Yifei; Wang, Yu; Ji, Xiaobo; Shao, Lei

doi:10.1039/c7ra00590c

Cited by 87 publications

(44 citation statements)

References 45 publications

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“…Also, slight shifts of the Ni (3p 1/2 and 3p 3/2 ) for AT-Ni/MOFDC to lower binding energies confirm the formation of mainly metallic Ni nanoparticles due to the induction of oxygen vacancies (O V ) and strong interaction between Ni and C, leading to increased electron density for the Ni, relative to Ni/MOFDC having additional Ni(OH) 2 satellites, which would have caused the higher binding energies of the Ni (2p 1/2 and 2p 3/2 ) with reduced electron density. 36 The C 1s of Ni/MOFDC ( Figure 2 c) was fitted into different peaks at binding energies of 287 eV (O=C–N), 285 eV (C–O), 284.6 eV (C sp 2 /sp 3 ), 37 and 282.2 eV for metallic carbide (Ni–C). 38 , 39 …”

Section: Resultsmentioning

confidence: 99%

Defect-Engineered Nanostructured Ni/MOF-Derived Carbons for an Efficient Aqueous Battery-Type Energy Storage Device

et al. 2020

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A Ni-based metal–organic framework (Ni-MOF) has been synthesized using a microwave-assisted strategy and converted to nanostructured Ni/MOF-derived mesoporous carbon (Ni/MOFDC) by carbonization and acid treatment (AT-Ni/MOFDC). The materials are well characterized with Raman, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and Brunauer–Emmett–Teller (BET), revealing that chemical etching confers on the AT-Ni/MOFDC-reduced average nanoparticle size (high surface area) and structural defects including oxygen vacancies. AT-Ni/MOFDC displays low series resistances and a higher specific capacity ( C s ) of 199 mAh g –1 compared to Ni/MOFDC (92 mAh g –1 ). This study shows that the storage mechanism of the Ni-based electrode as a battery-type energy storage (BTES) system can be controlled by both non-faradic and faradic processes and dependent on the sweep rate or current density. AT-Ni/MOFDC reveals mixed contributions at different rates: 75.2% faradic and 24.8% non-faradic contributions at 5 mV s –1 , and 34.1% faradic and 65.9% non-faradic at 50 mV s –1 . The full BTES device was assembled with AT-Ni/MOFDC as the cathode and acetylene black (AB) as the anode. Compared to recent literature, the AT-Ni/MOFDC//AB BTES device exhibits high energy (33 Wh kg –1 ) and high power (983 W kg –1 ) with excellent cycling performance (about 88% capacity retention over 2000 cycles). This new finding opens a window of opportunity for the rational designing of next-generation energy storage devices, supercapatteries, that combine the characteristics of batteries (high energy) and supercapacitors (high power).

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Section: Resultsmentioning

confidence: 99%

Defect-Engineered Nanostructured Ni/MOF-Derived Carbons for an Efficient Aqueous Battery-Type Energy Storage Device

et al. 2020

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“…It is clearly seen that the peak current increases with the increase of the scan rate and the peak current linearly increases with the square root of the scan rate (Figure 8b) which indicates that the electron transfer is reversible in terms of the diffusion layer thickness. 37…”

Section: Resultsmentioning

confidence: 99%

One Step Synthesis of a Gold/Ordered Mesoporous Carbon Composite Using a Hard Template Method for Electrocatalytic Oxidation of Methanol and Colorimetric Determination of Glutathione

et al. 2019

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Ordered mesoporous carbon-supported gold nanoparticles (Au/OMC) have been fabricated in one step through a hard template method using gold nanoparticle-intercalated mesoporous silica (GMS) to explore two different catalytic properties, for example, electrocatalytic oxidation of methanol and colorimetric determination of glutathione (GSH). The catalytically inert but conducting nature of mesoporous carbon (OMC) and promising catalytic activity of gold nanoparticles (AuNPs) has inspired us to synthesize Au/OMC. The as-prepared Au/OMC catalyst was characterized by powder X-ray diffraction, N2 adsorption–desorption, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray analysis-elemental mapping, and X-ray photoelectron spectroscopy. The characterization results indicate that AuNPs are uniformly distributed on the surface of OMC. The conducting-OMC framework with a high surface area of Au/OMC provides superior transport of electrons through the porous surface of carbon matrix and resulted in its high efficiency and stability as an electrocatalyst for the oxidation of methanol in comparison to CMK-3, SBA-15, and GMS in alkaline medium. The efficiency of Au/OMC toward methanol oxidation in alkaline medium is much higher in comparison to that in acidic medium. The lower value of If/Ib in the acidic medium in comparison to that in the alkaline medium clearly indicates that the oxidation process with Au/OMC as a catalyst is much more superior in alkaline medium with better tolerance toward the accumulation of intermediate CO species on the active surface area. Furthermore, the Au/OMC catalyst is successfully utilized for the detection and quantification of GSH spectrophotometrically with a limit of detection value of 0.604 nM.

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“…This is due to the formation of NiOOH, which has unpaired d‐electrons and empty d‐orbitals available for bond formation with adsorbed species or redox intermediates , . Different Ni‐nanostructured morphologies, such as nanoparticles and core‐shell nanoparticles , , ultra‐thin sheets , and nanoflakes have been tested in efforts to increase the catalyst surface area and to improve their intrinsic catalytic properties. The synthesis of these materials usually involves several complicated steps, like atomic layer deposition , ion implantation or electroless deposition , contrary to electrodeposition that can be carried out in single and multiple potential steps on the substrate .…”

Section: Introductionmentioning

confidence: 99%

Electrocatalytic Activity of Galvanostatically Deposited Ni Thin Films for Methanol Electrooxidation

et al. 2019

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Nickel and nickel‐based nanomaterials are an attractive choice to replace noble metals as electrocatalysts in alkaline direct alcohol fuel cells (ADAFCs) owing to their lower cost and suitable electrocatalytic activity. Among the different synthetic methods available for the production of nanostructured materials, galvanostatic electrodeposition offers a fast and simple means of fabricating active electrodes. Therefore, thin‐layers of nickel were electrodeposited onto polycrystalline gold electrodes using constant current pulses from an electrolyte containing 50 mM NiSO4. Combined effects of current density pulse and the presence of sulfate or chloride anions in the supporting electrolyte on the electrocatalytic activity of the deposited nickel nanostructures were studied. The surface concentration of Ni(OH)2 in alkaline medium, evaluated through cyclic voltammetry in 0.5M methanol + 1M KOH, was used as a performance parameter together with the electrocatalytic intensity, EI, defined as the sum of forward and reverse currents densities in methanol electro‐oxidation. It was found that highest electrocatalytic activities were obtained when using current density pulses close to 4.0 × 10−3A cm−2 in the presence of sulfates, which leads to a strong correlation between the electrocatalytic activity for the oxidation of methanol and the surface concentration of Ni(OH)2, displaying better properties than their chloride counterparts.

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Nickel nanoparticles supported on nitrogen-doped honeycomb-like carbon frameworks for effective methanol oxidation

Abstract: Nitrogen-doped honeycomb-like carbon framework supported nickel nanoparticles synthesized by a low-cost and scalable method for effective methanol oxidation.

Cited by 87 publications

References 45 publications

Defect-Engineered Nanostructured Ni/MOF-Derived Carbons for an Efficient Aqueous Battery-Type Energy Storage Device

Defect-Engineered Nanostructured Ni/MOF-Derived Carbons for an Efficient Aqueous Battery-Type Energy Storage Device

One Step Synthesis of a Gold/Ordered Mesoporous Carbon Composite Using a Hard Template Method for Electrocatalytic Oxidation of Methanol and Colorimetric Determination of Glutathione

Electrocatalytic Activity of Galvanostatically Deposited Ni Thin Films for Methanol Electrooxidation

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