Reflux-based synthesis and electrocatalytic characteristics of nickel phosphate nanoparticles

Al‐Omair, Mohammed A.; Touny, Ahmed H.; Saleh, Mahmoud M.

doi:10.1016/j.jpowsour.2016.09.079

Cited by 57 publications

(21 citation statements)

References 53 publications

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“…It is reported that the peaks (2 and 8), (5 and 12), and (6 and 13) result from the librational mode, bending vibrational mode, and O−H stretching mode of a water molecule that may be adsorbed on the catalysts. 45,46 The strong peaks (1 and 7) and peaks (3, 4, 9, 10, and 11) could be assigned to asymmetric−symmetric bending or stretching vibrational modes of the P−O anionic groups, respectively. 45−48 The sharp, split, and blue-shifted peaks in c-Ni 5 Fe 1 PO-C 700 are ascribed to the formation of a crystalline structure with a more inert pyrophosphate group.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Amorphous Bimetallic Phosphate–Carbon Precatalyst with Deep Self-Reconstruction toward Efficient Oxygen Evolution Reaction and Zn–Air Batteries

Liu

Yin

Dai

et al. 2021

ACS Sustainable Chem. Eng.

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Amorphous transition-metal compounds (a-TMC) have attracted more and more attention due to their high electrocatalytic activity for the oxygen evolution reaction (OER). However, it is still a challenge to in situ synthesize a-TMC-carbon nanocomposites at elevated temperature and figure out the exact advantages of the amorphous structure. Here, an amorphous iron-doped nickel phosphate–carbon hollow nanocomposite (a-NiFePO-C) has been simply prepared by coprecipitation of metal ions and phytic acid, followed by a controllable annealing process. The results show that a-NiFePO-C can achieve a low overpotential of 268 mV at 10 mA/cm2 and maintain 91.3% of the initial current density after a 9 h chronoamperometry test in a 1 M KOH solution with low mass loading of 0.1 mg/cm2. The excellent performance of a-NiFePO-C is attributed to the low charge-transfer resistance, bulk self-reconstruction, and synergetic oxidation of the bimetallic sites during cyclic voltammetry (CV) activation, resulting in the formation of a highly OER-active Fe(III)-Ni(oxy)hydroxide-carbon nanocomposite. Moreover, the rechargeable Zn–air batteries powered by the a-NiFePO-C + Pt/C electrode can present a lower charging voltage and superior cycle performance than that powered by a commercial RuO2 + Pt/C electrode.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Amorphous Bimetallic Phosphate–Carbon Precatalyst with Deep Self-Reconstruction toward Efficient Oxygen Evolution Reaction and Zn–Air Batteries

Liu

Yin

Dai

et al. 2021

ACS Sustainable Chem. Eng.

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“…The appearance of new bands at 492 and 566 cm −1 are assigned to the P–O vibrations. [ 78,79 ] Moreover, the band at 717 cm −1 is attributed to the vibration mode of P–O–P bending groups, and the band at 899 cm −1 could be assigned to symmetric stretching, and the band at 1084 cm −1 is assigned to asymmetric stretching modes of PO 4 3− /P 2 O 7 4− anion. The peak at 1308 cm −1 is assigned to the stretching mode of the PO.…”

Section: Resultsmentioning

confidence: 99%

Crystal exploring, Hirshfeld surface analysis, and properties of 4′‐(furan‐2‐yl)‐2,2′:6′,2″‐terpyridine complexes of nickel (II): New precursors for the synthesis of nanoparticles

Momeni

Anari

Torrei

et al. 2021

Applied Organom Chemis

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A series of mono‐ and bis‐terpyridine complexes of nickel (II) based on the 4′‐(furan‐2‐yl)‐2,2′:6′,2″‐terpyridine (ftpy) have been synthesized and structurally characterized using elemental analysis, infrared spectroscopy, and single crystal X‐ray diffraction. The reaction of NiCl2•6H2O with ftpy has been resulted in the formation of new bis‐terpyridine complex [Ni (ftpy)2](PF6)•2H2O (1). The new complex [Ni (ftpy)2](PF6)2 (2), obtained during the crystallization of 1 in methanol, was characterized using X‐ray crystallography, which shows that six nitrogen atoms from terpyridine ligands occupy the coordination sites around the Ni (II) in a distorted octahedral geometry. On the other hand, the reaction of NiCl2•6H2O with ftpy in a 1:2 or 1:1 mole ratio in methanol in the presence of KSCN affords two new thiocyanato complexes [Ni (ftpy)2](SCN)2•2H2O (3) and [Ni (ftpy)(NCS)2(H2O)]•2H2O (4), respectively. The crystal structure of 3 reveals that nickel (II) is hexa‐coordinated in a distorted octahedral geometry NiN6 involving six atoms of two ftpy ligand; the ftpy ligands are perpendicular to each other. The new complex [Ni (ftpy)(NCS)2(DMSO)]•DMSO (5) is obtained during the crystallization of 4 in DMSO. The crystal structure of 5 reveals that the nickel (II) is hexa‐coordinated by three nitrogen atoms of ftpy, two NCS−, a DMSO in a slightly distorted octahedral geometry. The X–H (XH, C, N, O) bond interactions control the arrangement of the supramolecular 3D framework. Hirshfeld surface analyses and two‐dimensional fingerprint plot reveal that the main interactions are H–H contacts for 2, 3, and 5, which comprise 34.1%, 37.2%, and 34.6%, respectively. Thermal decomposition of the coordination complexes led to the formation of Ni, NiO, and Ni2P2O7 nanoparticles (NPs). The resulting NPs were fully characterized by powder XRD, field emission scanning electron microscopy (FESEM), transmission electron microscope (TEM), and energy‐dispersive X‐ray spectroscopy (EDX). The formation of these NPs indicates the role of the precursor complexes and counterion. Our results indicate that the NPs with the smaller size could be obtained at calcination temperature of 600 °C. Thermal and luminescent properties of complexes have been discussed in detail.

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“…The last peak at 288.88 eV is indicative of a C=O bond, most likely due to surface absorbed CO2 for their storage under ambient conditions 62 The surface functionalization of the nickel phosphide nanoparticles made by milling was also confirmed using ATR-FTIR. Specifically, analysis of the dried powder catalyst revealed a pair of bands at 2360 cm -1 and 2340 cm -1 indicative of C-H stretches found in the surface alkyl amine ligands, as well as a large distinct signal at 1057 cm -1 , indicative of the P=O double bond vibration due to partial oxidation 64 (Figure S24).…”

Section: Effect Of Ligand Chain-length and Ligand Loadingmentioning

confidence: 99%

Solvent-Free Mechanochemical Synthesis of Ultrasmall Nickel Phosphide Nanoparticles and Their Application as a Catalyst for the Hydrogen Evolution Reaction (HER)

Fiss

Douglas

et al. 2020

ACS Sustainable Chem. Eng.

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Reflux-based synthesis and electrocatalytic characteristics of nickel phosphate nanoparticles

Cited by 57 publications

References 53 publications

Amorphous Bimetallic Phosphate–Carbon Precatalyst with Deep Self-Reconstruction toward Efficient Oxygen Evolution Reaction and Zn–Air Batteries

Amorphous Bimetallic Phosphate–Carbon Precatalyst with Deep Self-Reconstruction toward Efficient Oxygen Evolution Reaction and Zn–Air Batteries

Crystal exploring, Hirshfeld surface analysis, and properties of 4′‐(furan‐2‐yl)‐2,2′:6′,2″‐terpyridine complexes of nickel (II): New precursors for the synthesis of nanoparticles

Solvent-Free Mechanochemical Synthesis of Ultrasmall Nickel Phosphide Nanoparticles and Their Application as a Catalyst for the Hydrogen Evolution Reaction (HER)

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