Finely tunable morphology controlled synthesis of spinel-cobalt oxide nanostructures and their electrocatalytic applications

Kannan, Palanisamy; Boopathi, S.; Kumaran, R.; Kundu, Manab; Sasidhran, M.; Maduraiveeran, Govindhan

doi:10.1016/j.materresbull.2018.11.028

Cited by 7 publications

(3 citation statements)

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“…The lattice fringes of Co 3 O 4 -NS shown in Figure a″ display an interplanar spacing of 0.286 nm, which matches well with that of the (220) plane. Co 3 O 4 -CP (Figure c″) shows a characteristic spacing of 0.454 nm for the (111) plane . This phenomenon indicates that Co 3 O 4 -NS and Co 3 O 4 -CP preferentially grow the (220) and (111) planes, respectively.…”

Section: Resultsmentioning

confidence: 88%

“…Co 3 O 4 -CP (Figure 1c″) shows a characteristic spacing of 0.454 nm for the (111) plane. 44 This phenomenon indicates that Co 34 A N 2 isothermal adsorption−desorption test was performed to investigate the specific surface area and pore structure of the three catalysts. As shown in Figure 2, the N 2 isothermal adsorption−desorption curves of the three catalysts all show the characteristics of type IV, and the type of hysteresis ring is typical of type H 3 .…”

Section: Methodsmentioning

confidence: 99%

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Co₃O₄ Nanosheets Preferentially Growing (220) Facet with a Large Amount of Surface Chemisorbed Oxygen for Efficient Oxidation of Elemental Mercury from Flue Gas

Zhu

Song

Han

et al. 2020

Environ. Sci. Technol.

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Oxygen vacancies can capture and activate gaseous oxygen, forming surface chemisorbed oxygen, which plays an important role in the Hg 0 oxidation process. Fine control of oxygen vacancies is necessary and a major challenge in this field. A novel method for facet control combined with morphology control was used to synthesize Co 3 O 4 nanosheets preferentially growing (220) facet to give more oxygen vacancies. X-ray photoelectron spectroscopy (XPS) results show that the (220) facet has a higher Co 3+ /Co 2+ ratio, leading to more oxygen vacancies via the Co 3+ reduction process. Density functional theory (DFT) calculations confirm that the (220) facet has a lower oxygen vacancy formation energy. Furthermore, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results suggest that Co 3 O 4 nanosheets yield more defects during the synthesis process. These results are the reasons for the greater number of oxygen vacancies in Co 3 O 4 nanosheets, which is confirmed by electron energy loss spectroscopy (EELS), Raman spectroscopy, and photoluminescence (PL) spectroscopy. Therefore, Co 3 O 4 nanosheets show excellent Hg 0 removal efficiency over a wide temperature range of 100−350 °C at a high gas hourly space velocity (GHSV) of 180 000 h −1 . Additionally, the catalytic efficiency of Co 3 O 4 nanosheets is still greater than 83%, even after 80 h of testing, and it recovers to its original level after 2 h of in situ thermal treatment at 500 °C.

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Section: Resultsmentioning

confidence: 88%

Section: Methodsmentioning

confidence: 99%

Co₃O₄ Nanosheets Preferentially Growing (220) Facet with a Large Amount of Surface Chemisorbed Oxygen for Efficient Oxidation of Elemental Mercury from Flue Gas

Zhu

Song

Han

et al. 2020

Environ. Sci. Technol.

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“…The hexagonal-shaped cobalt oxide nanosheets were synthesised using a low temperature-based hydrothermal method. 28 In brief, 0.765 g (0.12 M) of Co(NO 3 ) 2 ·6H 2 O precursor was added to 35 mL of distilled water and thoroughly mixed to obtain a homogeneous mixture. Then, 0.3 M NaOH was added drop-wise into the previous solution with stirring at 500 rpm until the pH of mixture reached to 13.…”

Section: Methodsmentioning

confidence: 99%

Hexagonal cobalt oxide nanosheet-based enzymeless electrochemical uric acid sensor with improved sensitivity

et al. 2023

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Tuning Octahedron Sites of CoV₂O₄ via Cationic Competition for Efficient Oxygen Evolution Reaction

Lv,

Wei,

et al. 2024

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Doping transition metal oxide spinels with metal ions represents a significant strategy for optimizing the electronic structure of electrocatalysts. Herein, a bimetallic Fe and Ru doping strategy to fine‐tune the crystal structure of CoV2O4 spinel for highly enhanced oxygen evolution reaction (OER) is presented performance. The incorporation of Fe and Ru is observed at octahedral sites within the CoV2O4 structure, effectively modulating the electronic configuration of Co. Density functional theory calculations have confirmed that Fe acts as a novel reactive site, replacing V. Additionally, the synergistic effect of Fe, Co, and Ru effectively optimizes the Gibbs free energy of the intermediate species, reduces the reaction energy barrier, and accelerates the kinetics toward OER. As expected, the best‐performing CoVFe0.5Ru0.5O4 displays a low overpotential of 240 mV (@10 mA cm−2) and a remarkably low Tafel slope of 38.9 mV dec−1, surpassing that of commercial RuO2. Moreover, it demonstrates outstanding long‐term durability lasting for 72 h. This study provides valuable insights for the design of highly active polymetallic spinel electrocatalysts for energy conversion applications.

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Finely tunable morphology controlled synthesis of spinel-cobalt oxide nanostructures and their electrocatalytic applications

Cited by 7 publications

References 43 publications

Co₃O₄ Nanosheets Preferentially Growing (220) Facet with a Large Amount of Surface Chemisorbed Oxygen for Efficient Oxidation of Elemental Mercury from Flue Gas

Co₃O₄ Nanosheets Preferentially Growing (220) Facet with a Large Amount of Surface Chemisorbed Oxygen for Efficient Oxidation of Elemental Mercury from Flue Gas

Hexagonal cobalt oxide nanosheet-based enzymeless electrochemical uric acid sensor with improved sensitivity

Tuning Octahedron Sites of CoV₂O₄ via Cationic Competition for Efficient Oxygen Evolution Reaction

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Finely tunable morphology controlled synthesis of spinel-cobalt oxide nanostructures and their electrocatalytic applications

Cited by 7 publications

References 43 publications

Co3O4 Nanosheets Preferentially Growing (220) Facet with a Large Amount of Surface Chemisorbed Oxygen for Efficient Oxidation of Elemental Mercury from Flue Gas

Co3O4 Nanosheets Preferentially Growing (220) Facet with a Large Amount of Surface Chemisorbed Oxygen for Efficient Oxidation of Elemental Mercury from Flue Gas

Hexagonal cobalt oxide nanosheet-based enzymeless electrochemical uric acid sensor with improved sensitivity

Tuning Octahedron Sites of CoV2O4 via Cationic Competition for Efficient Oxygen Evolution Reaction

Contact Info

Product

Resources

About

Co₃O₄ Nanosheets Preferentially Growing (220) Facet with a Large Amount of Surface Chemisorbed Oxygen for Efficient Oxidation of Elemental Mercury from Flue Gas

Co₃O₄ Nanosheets Preferentially Growing (220) Facet with a Large Amount of Surface Chemisorbed Oxygen for Efficient Oxidation of Elemental Mercury from Flue Gas

Tuning Octahedron Sites of CoV₂O₄ via Cationic Competition for Efficient Oxygen Evolution Reaction