Surface Reactivity of NiO:  Interaction with Methanol

Natile, Marta Maria; Glisenti, Antonella

doi:10.1021/cm0211047

Cited by 75 publications

(50 citation statements)

References 51 publications

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“…The partial surface reduction and resulting melting transition are in accord with previous studies of methanol adsorbed on NiO. In these works, upon heating, molecular desorption of the alcohol competes with surface decomposition to carbon, hydrogen, and oxygen [48]. The carbon-containing decomposition products may abstract surface oxygen upon desorption.…”

Section: Scanning Electron Microscopy and Thermal Analyses Of Sintesupporting

confidence: 87%

The effect of milling additives on powder properties and sintered body microstructure of NiO

2015

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The evolution of powder particle size, crystal structure, and surface chemistry was evaluated for micron scale NiO powders subjected to impact milling with commonly employed milling additives: methanol, Vertrel XF, and amorphous carbon. The effect of the different comminution protocols on sintered body microstructure was evaluated for high temperature sintering in inert atmosphere (N 2 ). X-ray photoelectron spectroscopy showed that NiO powder surface chemistry is surprisingly sensitive to milling additive choice. In particular, the proportion of powder surface defect sites varied with additive, and methanol left an alcohol or alkoxy residue even after drying. Upon sintering to intermediate temperatures (1100 ℃), scanning electron microscopy (SEM) showed that slurry milled NiO powders exhibit hindered sintering behaviors. This effect was amplified for NiO milled with methanol, in which sub-500 nm grain sizes dominated even after sintering to 1100 ℃. Upon heating to high temperatures (1500 ℃), simultaneous differential scanning calorimetry/thermogravimetric analysis (DSC/TGA) showed that the powders containing carbon residues undergo carbothermal reduction, resulting in a melting transition between 1425 and 1454 ℃. Taken together, the results demonstrated that when processing metal oxide powders for advanced ceramics, the choice of milling additive is crucial as it exerts significant control over sintered body microstructure.

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Section: Scanning Electron Microscopy and Thermal Analyses Of Sintesupporting

confidence: 87%

The effect of milling additives on powder properties and sintered body microstructure of NiO

2015

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“…3b, in which two Ni 2p core levels (2p 1/2 and 2p 3/2 ) and two satellite peaks are observed. The binding energy separation between core levels Ni 2p 1/2 (872.95 eV) and Ni 2p 3/2 (855.39 eV) is 17.56 eV, which matches with electronic states of NiO [36]. While the peaks located at 852.0 and 869.15 eV are associated with the typical binding energies for Ni 2p 3/2 and Ni 2p 1/2 of Ni 0 [37] respectively.…”

Section: Resultssupporting

confidence: 53%

Acid promoted Ni/NiO monolithic electrode for overall water splitting in alkaline medium

Hou

et al. 2017

Sci. China Mater.

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Exploring and designing bi-functional catalysts with earth-abundant elements that can work well for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline medium are of significance for producing clean fuel to relieve energy and environment crisis. Here, a novel Ni/NiO monolithic electrode was developed by a facile and cost-effective acid promoted activation of Ni foam. After the treatment, this obtained monolithic electrode with a layer of NiO on its surface demonstrates rough and sheet-like morphology, which not only possesses larger accessible surface area but also provides more reactive active sites. Compared with powder catalysts, this monolithic electrode can achieve intimate contact between the electrocatalyst and the current collector, which will alleviate the problem of pulverization and enable the stable function of the electrode. It can be served as an efficient bi-functional electrocatalyst with an overpotential of 160 mV for HER and 290 mV for OER to produce current densities of 10 mA cm −2 in the alkaline medium. And it maintains benign stability after 5,000 cycles, which rivals many recent reported noble-metal free catalysts in 1.0 mol L −1 KOH solution. Attributed to the easy, scalable methodology and high catalytic efficiency, this work not only offers a promising monolithic catalyst but also inspires us to exploit other inexpensive, highly efficient and self-standing noble metalfree electrocatalysts for scale-up electrochemical water-splitting technology.

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“…For this reason, the quantity of NiOOH species necessary for methanol oxidation begins to decrease in the methanol oxidation current density. Marta Maria Natile et al studied the interaction between Ni(III) and methanol, and found that the interaction is mainly molecular at room temperature [26]. On the other hand, another conception was proposed by Taraszewska and Roslonek [27] that methanol molecules penetrate the nickel hydroxide film and were oxidized by the OH À ions trapped in the film.…”

Section: Electrocatalytic Oxidation Of Methanol At Ni/niodmg Modifiedmentioning

confidence: 99%

Methanol electrooxidation on a nickel electrode modified by nickel–dimethylglyoxime complex formed by electrochemical synthesis

Golikand

Asgari

Maragheh

et al. 2006

Journal of Electroanalytical Chemistry

115

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Surface Reactivity of NiO: Interaction with Methanol

Cited by 75 publications

References 51 publications

The effect of milling additives on powder properties and sintered body microstructure of NiO

The effect of milling additives on powder properties and sintered body microstructure of NiO

Acid promoted Ni/NiO monolithic electrode for overall water splitting in alkaline medium

Methanol electrooxidation on a nickel electrode modified by nickel–dimethylglyoxime complex formed by electrochemical synthesis

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