Metallurgical Nickel Analysis

Mogerman, W.D.

doi:10.1021/ie50509a021

Cited by 3 publications

(3 citation statements)

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“…It is also observed that the oxidation peak shifts anodically with an increase in the Fe content. It has been reported that an increase in the Fe content in NiFe-LDH may result in a partial charge transfer from Fe to Ni centers. ,− This explains the anodic shift in the CV curves with increase in the Fe content. In addition, Fe exposed on the surface of hydroxide layers contributes to improvement of the conductivity and results in the increase of the electrocatalytic activity of OER. , …”

Section: Discussionmentioning

confidence: 91%

Role of Transition Metals in Layered Double Hydroxides for Differentiating the Oxygen Evolution and Nonenzymatic Glucose Sensing

Moolayadukkam

Thomas

Sahoo

et al. 2020

ACS Appl. Mater. Interfaces

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Layered double hydroxides (LDH) belong to the class of two-dimensional materials having a wide variety of applications ranging from energy storage to catalysis. Often, these materials when used for nonenzymatic electrochemical glucose sensing tend to be interfering with oxygen evolution reaction (OER), resulting in overestimation of the glucose. Herein, to address this, NiFe-based LDH were selected because of their ability to vary the metal ratios. The synthesized LDH have been characterized using various spectroscopic and microscopic techniques. Among the LDH synthesized, Ni4Fe-LDH have been able to differentiate the glucose oxidation potential and the onset potential of OER with minimum interference. The Ni4Fe-LDH sensor shows a sensitivity of 20.43 μA mM–1 cm–2 in the linear range of 0–4 mM concentrations. To further enhance the sensitivity, composites of reduced graphene oxide (rGO) have been synthesized in situ, and the Ni4Fe/rGO5 composites have shown an increased sensitivity of 176.8 μA mM–1 cm–2 attributed to the charge-transfer interactions. To understand the experimental observations, detailed computational studies have been carried out to study the effect of the electronic structure on the metal ratios of the LDH and its role in differentiating glucose sensing and the oxygen evolution reaction. Along with this, theoretical calculations are also carried out on LDH–graphene composites to study the charge-transfer interactions.

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Section: Discussionmentioning

confidence: 91%

Role of Transition Metals in Layered Double Hydroxides for Differentiating the Oxygen Evolution and Nonenzymatic Glucose Sensing

Moolayadukkam

Thomas

Sahoo

et al. 2020

ACS Appl. Mater. Interfaces

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“…It has been proposed that an increased Fe content in bimetallic Ni–Fe composites may result in partial-charge transfer from Fe sites to activate Ni centers, and enhance the catalytic activity. In addition, Fe exposed on the surface of hydroxide layers is contributing to an improved conductivity, beneficial in increasing the reaction efficiency. − …”

Section: Resultsmentioning

confidence: 99%

A Superlattice of Alternately Stacked Ni–Fe Hydroxide Nanosheets and Graphene for Efficient Splitting of Water

et al. 2015

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Cost-effective electrocatalysts based on nonprecious metals for efficient water splitting are crucial for various technological applications represented by fuel cell. Here, 3d transition metal layered double hydroxides (LDHs) with varied contents of Ni and Fe were successfully synthesized through a homogeneous precipitation. The exfoliated Ni-Fe LDH nanosheets were heteroassembled with graphene oxide (GO) as well as reduced graphene oxide (rGO) into superlattice-like hybrids, in which two kinds of oppositely charged nanosheets are stacked face-to-face in alternating sequence. Heterostructured composites of Ni2/3Fe1/3 LDH nanosheets and GO (Ni2/3Fe1/3-GO) exhibited an excellent oxygen evolution reaction (OER) efficiency with a small overpotential of about 0.23 V and Tafel slope of 42 mV/decade. The activity was further improved via the combination of Ni2/3Fe1/3 LDH nanosheets with more conductive rGO (Ni2/3Fe1/3-rGO) to achieve an overpotential as low as 0.21 V and Tafel plot of 40 mV/decade. The catalytic activity was enhanced with an increased Fe content in the bimetallic Ni-Fe system. Moreover, the composite catalysts were found to be effective for hydrogen evolution reaction. An electrolyzer cell powered by a single AA battery of 1.5 V was demonstrated by using the bifunctional catalysts.

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“…Mogerman published some interesting historical information concerning the analytical difficulties that delayed recognition of Cronstedt's discovery of nickel (81). The determination of nickel was discussed with particular attention to several critical factors involved in the dimethylglyoxime method.…”

Section: Miscellaneous Metalsmentioning

confidence: 99%

Nonferrous Metallurgy

Moss¹

1953

Anal. Chem.

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Metallurgical Nickel Analysis

Cited by 3 publications

References 1 publication

Role of Transition Metals in Layered Double Hydroxides for Differentiating the Oxygen Evolution and Nonenzymatic Glucose Sensing

Role of Transition Metals in Layered Double Hydroxides for Differentiating the Oxygen Evolution and Nonenzymatic Glucose Sensing

A Superlattice of Alternately Stacked Ni–Fe Hydroxide Nanosheets and Graphene for Efficient Splitting of Water

Nonferrous Metallurgy

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