Fabrication of nanocrystalline high-entropy oxide CoNiFeCrMnO<sub><i>x</i></sub> thin film electrodes by dip-coating for oxygen evolution electrocatalysis

Wu, Qingyang; Alkemper, Achim; Lauterbach, Stefan; Hofmann, Jan P.; Einert, Marcus

doi:10.1039/d4ya00026a

Cited by 6 publications

(1 citation statement)

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“…46 Compared to the local valence distribution of the alloying elements in the HEA sample (Fig. S2†), their promotion to higher oxidation states in the HEO NPs, particularly in the case of Fe and Co atoms, may play a vital role in optimizing the interaction between the reactant molecules and the catalyst surface, 47,48 and hence improve the photocatalytic performance.…”

Section: Resultsmentioning

confidence: 99%

High entropy spinel oxide nanoparticles for visible light-assisted photocatalytic degradation of binary mixture of antibiotic pollutants in different water matrixes

Das,

Kumar,

Sarkar

et al. 2024

J. Mater. Chem. A

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Section: Resultsmentioning

confidence: 99%

High entropy spinel oxide nanoparticles for visible light-assisted photocatalytic degradation of binary mixture of antibiotic pollutants in different water matrixes

Das,

Kumar,

Sarkar

et al. 2024

J. Mater. Chem. A

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Surface Defects, Ni³⁺ Species, Charge Transfer Resistance, and Surface Area Dictate the Oxygen Evolution Reaction Activity of Mesoporous NiCo₂O₄ Thin Films

Dubai,

Wu,

Lauterbach

et al. 2024

ChemNanoMat

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NiCo2O4 has been proven to show high electrocatalytic activity, however facile and inexpensive techniques for preparation of this compound as mesostructured thin film is lacking. In this study, the sol‐gel synthesis of nanocrystalline mesoporous spinel NiCo2O4 thin films by dip‐coating and soft‐templating using the evaporation‐induced self‐assembly approach is reported. The morphology and crystallographic structure were thoroughly probed by various physicochemical characterization techniques collectively validating the development of uniform mesoporous NiCo2O4 architectures crystallizing exclusively in the cubic spinel phase after calcination in air. The surface area of the thin films depended on the calcination temperature. XPS investigations showed that the amount of Ni3+ and defective oxygen species increased for decreasing calcination temperatures. The overall electrochemical surface area, Ni3+ content, charge transfer resistance, and amount of defective oxygen sites were found to collectively control the oxygen evolution reaction performance. After an optimized annealing procedure at 300°C and chronopotentiometric analysis at 10 mA/cm2 for 1.5 h, a low overpotential of 330 mV vs. RHE at 10 mA/cm2 in alkaline solution was achieved. The results highlight the necessity of precise selection of the appropriate calcination temperature and electrochemical pre‐treatment conditions for adjusting the concentration of electrocatalytically active reaction sites of sol‐gel‐derived NiCo2O4 thin films.

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The effect of particle size on structural and catalysts for oxygen evolution reaction of (CoFeNiMnCr)3O4 prepared by controlled synthesis with polyvinylpyrrolidone (PVP)

Alves,

Raimundo,

Lima

et al. 2025

Journal of Colloid and Interface Science

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Fabrication of nanocrystalline high-entropy oxide CoNiFeCrMnO_x thin film electrodes by dip-coating for oxygen evolution electrocatalysis

Abstract: Nanocrystalline high-entropy CoNiFeCrMnOx thin films were prepared by dip-coating and annealing at 400 °C, showing stable oxygen evolution with overpotentials of 258 mV vs. RHE at 10 mA cm−2 over 10 hours in alkaline media.

Cited by 6 publications

References 55 publications

High entropy spinel oxide nanoparticles for visible light-assisted photocatalytic degradation of binary mixture of antibiotic pollutants in different water matrixes

High entropy spinel oxide nanoparticles for visible light-assisted photocatalytic degradation of binary mixture of antibiotic pollutants in different water matrixes

Surface Defects, Ni³⁺ Species, Charge Transfer Resistance, and Surface Area Dictate the Oxygen Evolution Reaction Activity of Mesoporous NiCo₂O₄ Thin Films

The effect of particle size on structural and catalysts for oxygen evolution reaction of (CoFeNiMnCr)3O4 prepared by controlled synthesis with polyvinylpyrrolidone (PVP)

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Fabrication of nanocrystalline high-entropy oxide CoNiFeCrMnOx thin film electrodes by dip-coating for oxygen evolution electrocatalysis

Abstract: Nanocrystalline high-entropy CoNiFeCrMnOx thin films were prepared by dip-coating and annealing at 400 °C, showing stable oxygen evolution with overpotentials of 258 mV vs. RHE at 10 mA cm−2 over 10 hours in alkaline media.

Cited by 6 publications

References 55 publications

High entropy spinel oxide nanoparticles for visible light-assisted photocatalytic degradation of binary mixture of antibiotic pollutants in different water matrixes

High entropy spinel oxide nanoparticles for visible light-assisted photocatalytic degradation of binary mixture of antibiotic pollutants in different water matrixes

Surface Defects, Ni3+ Species, Charge Transfer Resistance, and Surface Area Dictate the Oxygen Evolution Reaction Activity of Mesoporous NiCo2O4 Thin Films

The effect of particle size on structural and catalysts for oxygen evolution reaction of (CoFeNiMnCr)3O4 prepared by controlled synthesis with polyvinylpyrrolidone (PVP)

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Fabrication of nanocrystalline high-entropy oxide CoNiFeCrMnO_x thin film electrodes by dip-coating for oxygen evolution electrocatalysis

Surface Defects, Ni³⁺ Species, Charge Transfer Resistance, and Surface Area Dictate the Oxygen Evolution Reaction Activity of Mesoporous NiCo₂O₄ Thin Films