On the preparation, structural and magnetic properties of ZnO:Co nanoparticles

Varadhaseshan, R.; Sundar, S. Meenakshi; Prema, C.

doi:10.1051/epjap/2014130316

Cited by 25 publications

(12 citation statements)

References 43 publications

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“…58 The peak observed at 472 cm −1 corresponds to the metal oxide (M−O) peak in the carbonized sample. 59,60 After the MoS 2 decoration by the hydrothermal method, the composite electrode displays the characteristic peaks at 1475, 1022, 864, and 683 cm −1 , which infers the successful growth of MoS 2 over the Ni−Co-anchored CFE. No distinct peak was observed after the phosphorous inclusion by the CVD method and could be endorsed to significantly less doping; however, the existence of phosphorous in the composite material has been ensured with other techniques.…”

Section: Resultsmentioning

confidence: 92%

MoS₂ Decoration Followed by P Inclusion over Ni-Co Bimetallic Metal–Organic Framework-Derived Heterostructures for Water Splitting

2021

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Demonstrating a highly efficient non-noble bifunctional catalyst for complete water electrolysis remains challenging because of kinetic limitations and crucial importance for future energy harvesting. Herein, a low-cost, integrated composite of a Ni–Co metal–organic framework decorated with thin MoS2 nanosheets was synthesized by a simple hydrothermal method followed by carbonization and phosphorization for electrochemical oxygen and hydrogen evolution reactions. Such a composite heterostructure exhibits outstanding performance in the electrocatalysis process with a lower overpotential of 184 mV for the oxygen evolution reaction (OER) and 84 mV for the hydrogen evolution reaction (HER) in 1.0 M KOH and 0.5 M H2SO4 electrolytes to reach a current density of 10 mA cm–2, with a slight Tafel slope of 63 mV dec–1 for the OER and 96 mV dec–1 for the HER. The obtained results are far better than those of the commercial benchmark catalyst. Furthermore, online gas chromatography quantifies the amount of hydrogen generation in a symmetric cell as equal to 0.002121 moles with an energy efficiency of about 2.237 mg/kWh. Thus, the composite electrode’s remarkable performance is further demonstrated as a potentially viable alternative non-noble electrocatalyst for energy conversion reactions.

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Section: Resultsmentioning

confidence: 92%

MoS₂ Decoration Followed by P Inclusion over Ni-Co Bimetallic Metal–Organic Framework-Derived Heterostructures for Water Splitting

2021

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“…The phase purity and possible defects in the synthesized materials were studied using Raman spectroscopy. The wurtzite structure of ZnO, which corresponds to the hexagonal Bravais lattice, has been solved in the previous literature using a C 6 v point group by using symmetry with an irreducible Γ = 2A 1 + 2B 1 + 2E 1 + 2E 2 . − Figure a shows the Raman spectra of ZnO and Co x Zn (1– x ) O samples. As observed by Gandhi, the A 1 (LO) vibrational mode at 550 cm –1 increases with increasing Co concentration, shadowing the second E 1 (LO) vibrational mode, which becomes a shoulder at higher concentration ratios.…”

Section: Results and Discussionmentioning

confidence: 99%

Ex Situ and In Situ Analyses of the Mechanism of Electrocatalytic Hydrogen Peroxide Production by Co_xZn_1–xO (0 < x < 0.018) Materials in Alkaline Media

Albadalejo

Alonso-Sevilla

Cintrón

et al. 2022

ACS Appl. Energy Mater.

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Metal oxide semiconductors have attracted much attention due to their versatility in different applications, ranging from biosensing to green energy-harvesting technologies. Among these metal oxides, oxide-based diluted magnetic semiconductors have also been proposed for fuel cell applications, especially for the oxygen reduction reaction (ORR) and the oxygen evolution reaction. However, the catalytic mechanism has been proposed to follow a two-electron pathway, forming hydrogen peroxide, instead of the four-electron pathway. Herein, we report cobalt-doped zinc oxide (Co x Zn1–x O, 0 < x < 0.018) materials prepared using a co-precipitation method suitable for the electrocatalytic production of hydrogen peroxide. The electrocatalytic performance of Co x Zn1–x O materials showed up to 60% hydrogen peroxide production with onset potentials near 649 mV, followed by the two-electron ORR mechanism. Ex situ X-ray absorption spectroscopy experiments at the Co K-edge demonstrated the presence of Co(II) ions at tetrahedral sites within the ZnO lattice.

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“… Microwave solvothermal synthesis of ZnO nanocomposites or ZnO hybrid nanostructures without any additional heat treatment, where the literature review results [ 798 , 799 , 800 , 801 , 802 , 803 , 804 , 805 , 806 , 807 , 808 , 809 , 810 , 811 , 812 , 813 , 814 , 815 , 816 , 817 , 818 , 819 , 820 , 821 , 822 ] are summarised in Table 11. Microwave solvothermal synthesis of undoped ZnO, ZnO nanocomposites or ZnO hybrid nanostructures with additional heat treatment, where the literature review results [ 823 , 824 , 825 , 826 , 827 , 828 , 829 , 830 , 831 , 832 , 833 , 834 , 835 , 836 , 837 , 838 ] are summarised in Table 12. …”

Section: Microwave Solvothermal Synthesis Of Znomentioning

confidence: 99%

“…Microwave solvothermal synthesis of undoped ZnO, ZnO nanocomposites or ZnO hybrid nanostructures with additional heat treatment, where the literature review results [ 823 , 824 , 825 , 826 , 827 , 828 , 829 , 830 , 831 , 832 , 833 , 834 , 835 , 836 , 837 , 838 ] are summarised in Table 12.…”

Section: Microwave Solvothermal Synthesis Of Znomentioning

confidence: 99%

“…The microwave solvothermal synthesis enables obtaining: ZnO doped with the following ions: Al 3+ [ 811 , 814 , 815 ], Co 2+ [ 232 , 798 , 799 , 800 , 801 , 808 , 809 , 810 , 812 , 833 , 834 , 835 ], Cr 3+ [ 232 , 809 ], Fe 2+ [ 232 , 810 , 836 ], Ga 3+ [ 815 ], In 3+ [ 811 ], Mg 2+ [ 817 ], Mn 2+ [ 232 , 802 , 804 , 809 , 810 , 812 , 837 ], Ni 2+ [ 232 , 809 , 810 , 813 ] and V 5+ [ 810 ]. ZnO co-doped with the following ions: Co 2+ –Mn 2+ [ 803 ] and Al 3+ –Ga 3+ [ 815 ].…”

Section: Microwave Solvothermal Synthesis Of Znomentioning

confidence: 99%

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A Review of Microwave Synthesis of Zinc Oxide Nanomaterials: Reactants, Process Parameters and Morphologies

2020

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Zinc oxide (ZnO) is a multifunctional material due to its exceptional physicochemical properties and broad usefulness. The special properties resulting from the reduction of the material size from the macro scale to the nano scale has made the application of ZnO nanomaterials (ZnO NMs) more popular in numerous consumer products. In recent years, particular attention has been drawn to the development of various methods of ZnO NMs synthesis, which above all meet the requirements of the green chemistry approach. The application of the microwave heating technology when obtaining ZnO NMs enables the development of new methods of syntheses, which are characterised by, among others, the possibility to control the properties, repeatability, reproducibility, short synthesis duration, low price, purity, and fulfilment of the eco-friendly approach criterion. The dynamic development of materials engineering is the reason why it is necessary to obtain ZnO NMs with strictly defined properties. The present review aims to discuss the state of the art regarding the microwave synthesis of undoped and doped ZnO NMs. The first part of the review presents the properties of ZnO and new applications of ZnO NMs. Subsequently, the properties of microwave heating are discussed and compared with conventional heating and areas of application are presented. The final part of the paper presents reactants, parameters of processes, and the morphology of products, with a division of the microwave synthesis of ZnO NMs into three primary groups, namely hydrothermal, solvothermal, and hybrid methods.

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On the preparation, structural and magnetic properties of ZnO:Co nanoparticles

Cited by 25 publications

References 43 publications

MoS₂ Decoration Followed by P Inclusion over Ni-Co Bimetallic Metal–Organic Framework-Derived Heterostructures for Water Splitting

MoS₂ Decoration Followed by P Inclusion over Ni-Co Bimetallic Metal–Organic Framework-Derived Heterostructures for Water Splitting

Ex Situ and In Situ Analyses of the Mechanism of Electrocatalytic Hydrogen Peroxide Production by Co_xZn_1–xO (0 < x < 0.018) Materials in Alkaline Media

A Review of Microwave Synthesis of Zinc Oxide Nanomaterials: Reactants, Process Parameters and Morphologies

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On the preparation, structural and magnetic properties of ZnO:Co nanoparticles

Cited by 25 publications

References 43 publications

MoS2 Decoration Followed by P Inclusion over Ni-Co Bimetallic Metal–Organic Framework-Derived Heterostructures for Water Splitting

MoS2 Decoration Followed by P Inclusion over Ni-Co Bimetallic Metal–Organic Framework-Derived Heterostructures for Water Splitting

Ex Situ and In Situ Analyses of the Mechanism of Electrocatalytic Hydrogen Peroxide Production by CoxZn1–xO (0 < x < 0.018) Materials in Alkaline Media

A Review of Microwave Synthesis of Zinc Oxide Nanomaterials: Reactants, Process Parameters and Morphologies

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MoS₂ Decoration Followed by P Inclusion over Ni-Co Bimetallic Metal–Organic Framework-Derived Heterostructures for Water Splitting

MoS₂ Decoration Followed by P Inclusion over Ni-Co Bimetallic Metal–Organic Framework-Derived Heterostructures for Water Splitting

Ex Situ and In Situ Analyses of the Mechanism of Electrocatalytic Hydrogen Peroxide Production by Co_xZn_1–xO (0 < x < 0.018) Materials in Alkaline Media