Phase and Shape Dependent Non-enzymatic Glucose Sensing Properties of Nickel Molybdate

Naik, Kusha Kumar; Ratha, Satyajit; Rout, Chandra Sekhar

doi:10.1002/slct.201600795

Cited by 15 publications

(8 citation statements)

References 53 publications

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“…The CV study of both the NCO and NCO–Pd nanosheets was carried out with and without glucose analytes in 0.1 M of NaOH solution in the potential range of 0–0.7 V at a scan rate of 20 mV s –1 . Figure A clearly specifies the spectrum of the glucose-sensing activity for both without and with 100 μM glucose inside of the solution, and the distinguished peak obtained at 0.5 V is assigned as the oxidation peak of pure NCO. − The detailed glucose-sensing mechanism of the NCO nanosheets has been explained in our previous study. − Here, we outline the governing reactions …”

Section: Resultsmentioning

confidence: 96%

Enhanced Nonenzymatic Glucose-Sensing Properties of Electrodeposited NiCo₂O₄–Pd Nanosheets: Experimental and DFT Investigations

Naik

Gangan

Chakraborty

et al. 2017

ACS Appl. Mater. Interfaces

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107

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Here, we report the facile synthesis of NiCoO (NCO) and NiCoO-Pd (NCO-Pd) nanosheets by the electrodeposition method. We observed enhanced glucose-sensing performance of NCO-Pd nanosheets as compared to bare NCO nanosheets. The sensitivity of the pure NCO nanosheets is 27.5 μA μM cm, whereas NCO-Pd nanosheets exhibit sensitivity of 40.03 μA μM cm. Density functional theory simulations have been performed to qualitatively support our experimental observations by investigating the interactions and charge-transfer mechanism of glucose on NiCoO and Pd-doped NiCoO through demonstration of partial density of states and charge density distributions. The presence of occupied and unoccupied density of states near the Fermi level implies that both Ni and Co ions in NiCoO can act as communicating media to transfer the charge from glucose by participating in the redox reactions. The higher binding energy of glucose and more charge transfer from glucose to Pd-doped NiCoO compared with bare NiCoO infer that Pd-doped NiCoO possesses superior charge-transfer kinetics, which supports the higher glucose-sensing performance.

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Section: Resultsmentioning

confidence: 96%

Enhanced Nonenzymatic Glucose-Sensing Properties of Electrodeposited NiCo₂O₄–Pd Nanosheets: Experimental and DFT Investigations

Naik

Gangan

Chakraborty

et al. 2017

ACS Appl. Mater. Interfaces

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107

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“…In addition, it has been reported that the NiMoO 4 has a phase-dependent selectivity and catalytic activity in the oxidative dehydrogenation of propane to propene 21 and glucose sensing property. 22 guide the rational design of novel NiMoO 4 -based electrocatalysts, it is essential that the phase-dependent catalytic activity of NiMoO 4 for the UOR process be identified. Herein, we synthesized NiMoO 4 •xH 2 O, α-NiMoO 4 , and β-NiMoO 4 to investigate the influence of phase on the electrocatalytic UOR process.…”

Section: ■ Introductionmentioning

confidence: 99%

“…However, as the NiMoO 4 catalysts in these reports consisted of mixtures of α-NiMoO 4 , β-NiMoO 4 , and NiMoO 4 · x H 2 O, , the role of the NiMoO 4 phase in the UOR activity remains ambiguous. In addition, it has been reported that the NiMoO 4 has a phase-dependent selectivity and catalytic activity in the oxidative dehydrogenation of propane to propene and glucose sensing property . Therefore, to guide the rational design of novel NiMoO 4 -based electrocatalysts, it is essential that the phase-dependent catalytic activity of NiMoO 4 for the UOR process be identified.…”

Section: Introductionmentioning

confidence: 99%

Phase-Dependent Reactivity of Nickel Molybdates for Electrocatalytic Urea Oxidation

Jeong

Elumalai

et al. 2020

ACS Appl. Energy Mater.

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Identifying the influence of the phase of a catalyst on its reactivity is crucial for guiding the rational design of highly active electrocatalysts. Herein, we unveil the phasedependent reactivity of nickel molybdates (NiMoO 4 ) for the electrocatalytic urea oxidation reaction (UOR). Various NiMoO 4 phases, namely, α-NiMoO 4 , β-NiMoO 4 , and the hydrate NiMoO 4 •xH 2 O, were synthesized, and their structural characteristics and electrochemical properties were related to their electrocatalytic performance for the UOR. The NiMoO 4 phase was found to determine its reactivity, and phase-dependent UOR activities were observed. In particular, β-NiMoO 4 exhibited a higher activity and faster kinetics than NiMoO 4 •xH 2 O and α-NiMoO 4 , which was attributed to the large electrochemical surface area, low Tafel slope, and small charge− transfer resistance of β-NiMoO 4 . Moreover, hydrogen generation via β-NiMoO 4 -catalyzed urea electrolysis achieved a much lower cell voltage (1.498 V to reach 10 mA cm −2 ) than that required for water electrolysis (1.633 V to reach 10 mA cm −2 ). This work provides insights into design strategies for high-activity electrocatalysts for energy-efficient hydrogen production.

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“…1b,c, respectively. And they have different coordination environments of Mo, namely, MoO6 for α-NiMoO4 and MoO4 for β-NiMoO4 11 . As a result, the transformation of the phase structures from NiMoO4•nH2O to NiMo(O) catalyst becomes vitally important for an in-depth analysis of the active sites, uncovering the nature of the HER.…”

Section: Introductionmentioning

confidence: 99%

Relation between NiMo(O) Phase Structures and Hydrogen Evolution Activities of Water Electrolysis

Wang¹,

Zhang²,

Tang³

et al. 2023

Acta Physico Chimica Sinica

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NiMo(O) catalysts show extremely low overpotential at high current density for the electrocatalytic hydrogen evolution reaction (HER). However, the real reason for the remarkable electrocatalytic activity is unclear. A new perspective for revealing the relation between the phase structures of the electrocatalysts and their electrocatalytic HER performance provides a deep insight into the nature of the HER. Herein, the dehydration and oxygenation of as-synthesized nickel molybdate hydrate (NiMoO4ꞏnH2O) are discussed and confirmed to be critical for evolving the catalytic phase structures in the subsequent reduction treatment. The typical phase evolution processes of the electrocatalysts were investigated using thermogravimetric (TG) analysis and H2 temperature-programmed reduction (H2-TPR). The crystalline phases were identified through X-ray diffraction (XRD), Raman spectroscopy, and high-resolution transmission electron microscopy (HRTEM) analyses. The phases of the electrocatalysts during the electrochemical tests were confirmed by in situ electrochemical XRD characterization. Three typical crystalline phases, MoNi4, β-NiMoO4, and α-NiMoO4, corresponding to significantly different HER activities, were proposed. The β-NiMoO4 dominant electrocatalyst (NiMoO4-400air-H2) exhibited the worst performance for alkaline water reduction, and an improvement was observed for the α-NiMoO4 electrocatalyst (NiMoO4-500air-H2). The NiMoO4-300air-H2 electrode derived from NiMoO4ꞏ(n−x)H2O exhibited the most active phase (MoNi4) and the best electrocatalytic HER performance. Moreover, the intrinsic electrocatalytic HER performance obtained from the electrochemical active surface area (ECSA) normalized activities exhibits the same tendency as the geometrically normalized ones. Varied adsorption capacities of the H2O, OH, and H intermediate species for water reduction on these typical phases are assumed to be responsible for the significantly different HER performance of the NiMoO4-(T)air-H2 electrodes through density functional theory analysis. Poor adsorption of H, OH radicals, and H2O on β-NiMoO4 impedes the water dissociation process, which may be the reason that it exhibits the worst electrocatalytic hydrogen evolution activity. Optimized adsorption abilities of H, OH, and H2O on α-NiMoO4 benefit the water reduction kinetics, leading to an enhanced electrocatalytic HER performance. MoNi4 forms the strongest interactions with H2O, H, and OH species, contributing to the best electrocatalytic hydrogen evolution activity. Further analysis of the energy barrier of the water-splitting reaction shows that these three crystalline phases exhibit different water dissociation ability, which is attributed to their varied adsorption capacities of the intermediate species for water reduction. Among them, MoNi4 and β-NiMoO4 exhibit the lowest and highest water dissociation barriers, respectively, in line with their electrocatalytic hydrogen evolution activities. The phase-dependent HER activity identified in this work can provide guidelines f...

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Phase and Shape Dependent Non-enzymatic Glucose Sensing Properties of Nickel Molybdate

Cited by 15 publications

References 53 publications

Enhanced Nonenzymatic Glucose-Sensing Properties of Electrodeposited NiCo₂O₄–Pd Nanosheets: Experimental and DFT Investigations

Enhanced Nonenzymatic Glucose-Sensing Properties of Electrodeposited NiCo₂O₄–Pd Nanosheets: Experimental and DFT Investigations

Phase-Dependent Reactivity of Nickel Molybdates for Electrocatalytic Urea Oxidation

Relation between NiMo(O) Phase Structures and Hydrogen Evolution Activities of Water Electrolysis

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Phase and Shape Dependent Non-enzymatic Glucose Sensing Properties of Nickel Molybdate

Cited by 15 publications

References 53 publications

Enhanced Nonenzymatic Glucose-Sensing Properties of Electrodeposited NiCo2O4–Pd Nanosheets: Experimental and DFT Investigations

Enhanced Nonenzymatic Glucose-Sensing Properties of Electrodeposited NiCo2O4–Pd Nanosheets: Experimental and DFT Investigations

Phase-Dependent Reactivity of Nickel Molybdates for Electrocatalytic Urea Oxidation

Relation between NiMo(O) Phase Structures and Hydrogen Evolution Activities of Water Electrolysis

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Enhanced Nonenzymatic Glucose-Sensing Properties of Electrodeposited NiCo₂O₄–Pd Nanosheets: Experimental and DFT Investigations

Enhanced Nonenzymatic Glucose-Sensing Properties of Electrodeposited NiCo₂O₄–Pd Nanosheets: Experimental and DFT Investigations