Photo-electrochemical properties of p-type AgCoO2 prepared by low temperature method

Saib, F.; Özel, Faruk; Sarılmaz, Adem; Mahroua, O.; Bellal, B.; Trari, M.

doi:10.1016/j.mssp.2018.11.026

Cited by 19 publications

(6 citation statements)

References 24 publications

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“…Attempts to synthesize the compound through different soft chemical methods including hydrothermal route, yielded a mixture of Ag and Co 3 O 4 along with AgCoO 2 . [7][8][9] The final compound is subjected to chemical leaching to remove the impurities before carrying other characterizations. Ion exchange method, the only route reported having yielded a single-phase AgCoO 2 with structure conforming to that of the precursors 10,11 Na x CoO 2 (S.G. P63 /mmc) or LiCoO 2 (S.G. 𝑅 3𝑚) used.…”

Section: Introductionmentioning

confidence: 99%

“…2 The compound is not amenable to conventional synthetic routes 2 due to the low free energy of formation of Ag 2 O and its decomposition at ∼473 K. 3 Reported to form at very high pressures of about 300 MPa 1 with optical transparency of 55%, 4 AgCoO 2 is projected to make a tremendous impact on technology. [4][5][6][7] Although it is known for five decades, only a handful of reports are available and the reason for this is largely attributed to the difficulties in synthesis. Attempts to synthesize the compound through different soft chemical methods including hydrothermal route, yielded a mixture of Ag and Co 3 O 4 along with AgCoO 2 .…”

Section: Introductionmentioning

confidence: 99%

“…Although it is known for five decades, only a handful of reports are available and the reason for this is largely attributed to the difficulties in synthesis. Attempts to synthesize the compound through different soft chemical methods including hydrothermal route, yielded a mixture of Ag and Co 3 O 4 along with AgCoO 2 7–9 . The final compound is subjected to chemical leaching to remove the impurities before carrying other characterizations.…”

Section: Introductionmentioning

confidence: 99%

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Phase pure rhombohedral R3¯m$R\bar{3}m$ AgCoO₂ delafossite: Rietveld, selected area electron diffraction, X‐ray photoemission spectroscopy, and magnetic studies

et al. 2022

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A p‐type rhombohedral AgCoO2 (S.G. Rtrue3¯m$R\bar 3m$) reported to form only at pressures greater than 300 MPa at 773 K, is stabilized in pure phase at 0.2 MPa oxygen pressure. Analysis of powder X‐ray diffraction pattern by Rietveld and selected area electron diffraction patterns confirms the purity of rhombohedral phase. Core‐shell X‐ray photoemission spectroscopy studies show that Ag ions are in +1 oxidation state with Co ions largely in +3 state. AgCoO2 is paramagnetic undergoing super‐paramagnetic transition at 44 K. The magnetic moment of Co is 0.001 μB which corresponds to low spin (LS) Co3+ along with a small fraction of LS Co4+ ions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phase pure rhombohedral R3¯m$R\bar{3}m$ AgCoO₂ delafossite: Rietveld, selected area electron diffraction, X‐ray photoemission spectroscopy, and magnetic studies

et al. 2022

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“…Fossil energy resources start to run out and the solar energy can partially take over. It becomes more and more attractive and meets an increasing demand in many fields like the photovoltaic [1,2] thermal conversion [3,4] photocatalysis [5,6] and environmental protection [7][8][9]. With a mean insulation of 1200 W m -2 and a duration exceeding 3000 h year -1 (South Algeria), the sun is an inexhaustible energetic source that represents a promising alternative.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of New Modified System: Polyaniline/1.5-Naphtalene Disulfonic Acid as Novel Photocatalyst in the H2 Production

Hamlaoui

Naar

Saib

et al. 2021

Preprint

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The semiconducting properties of the system Polyaniline / 1.5-naphtalene disulfonic acid are investigated for the first time to assess its photocatalytic performance for the hydrogen evolution under visible light irradiation. PANI is thermally stable up to ~ 300 °C, above which a weight loss of ~ 1.2% occurs. The X-ray diffraction pattern shows broad peaks with a particle size of ~ 7 nm, leading to an active surface area of ∼ 400 m2 g−1. A direct optical transition at 1.96 eV, is determined from the diffuse reflectance spectrum. The electrical conductivity of PANI-NDSA follows an exponential law with activation energy of 0.24 eV. The p-type conduction of PANI-NDSA is evidenced from the (capacitance-2 – potential) characteristic plot; a flat band potential (Efb) of 0.82 VSCE and a holes density (NA) of 8.43× 1024 m-3 are determined in neutral solution (Na2SO4 0.1 M). The electrochemical impedance spectroscopy, measured over an extended frequency domain (1 mHz - 1010 Hz), indicates the contribution of both the bulk and grain boundaries with a constant phase element (CPE). As application, PANI-NDSA is successfully tested for the hydrogen production upon visible light owing to the potential of its conduction band (-0.75 VSCE), less cathodic than that of H2O/H2 (~ -0.30 VSCE). H2 liberation rate of 3840 h-1 (g catalyst)-1 and a quantum efficiency of 0.34% under full light (29 mW cm-2) are obtained using Fe(CN)64- as reducing agent. The photoactivity is completely restored during the second cycle.

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“…Various approaches, mainly solid state 17 , sol-gel 18 , co-precipitation 19 , and hydrothermal precursor 20 , have been utilized to synthesize delafossites, but to the best of our knowledge, no prior studies have been conducted using the citrate-auto combustion method. Interestingly, the architecture adopted by the various ABO 2 compounds actually depends on the type of cations and the preparation technique.…”

mentioning

confidence: 99%

A facile novel synthesis of AgCuO2 delafossite nanoparticles and evaluation of their antimicrobial activity

Ateia

Arman

Mohamed

2023

Sci Rep

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Bi-functional nano-oxides are of growing interest to address environmental issues. In the present study, the structural and magnetic data are presented together with the antimicrobial activities (AMA). For the first time, silver delafossite oxide (AgCuO2) is successfully fabricated using a simple, low-cost technique to target antibiotic photodegradation and inactivation of model waterborne pathogens. It is prepared with an equimolar initial Ag+:Cu+ concentration ratio. The structure, morphology, and magnetic properties are studied by different characterization techniques. The size and shape of AgCuO2 NPs, in addition to their structural polytypes of 2H (hexagonal) or 3R (rhombohedral), are dependent on the preparation conditions. The existence of Cu, Ag, and O in the synthesized delafossite AgCuO2 NPs with no evidence of any impurity is ratified by the XPS spectrum. AFM measurements are taken to characterize the surface morphologies of AgCuO2. The distributed spiks are evaluated by roughness kurtosis (Rku). The roughness kurtosis has a value of 2.65 (< 3), indicating that the prepared sample is classified as bumpy. The prepared sample has 13.0, 10.0, 14.0, and 14.0 mm Inhibition Zone Diameter (IZD) antimicrobial activity against gram-positive Bacillus subtilis (B. subtilis), Bacillus cereus (B. cereus), Enterococcus faecalis (E. faecalis), and Staphylococcus aureus (S. aureus), respectively. The IZD for gram-negative Escherichia coli (E. coli), Neisseria Gonorrhoeae (N. Gonorrhoeae), Pseudomonas aeruginosa (P. aeruginosa), and Salmonella typhimrium (S. typhimrium) were found to be 12.0, 13.0, 14.0, and 13.0 mm, respectively. Therefore, the AgCuO2 NPs reveal excellent antimicrobial efficiency, and they can be effortlessly separated using a tiny magnet or a simple magnetic separator. The adequate cytotoxicity and magnetic characteristics of the antimicrobial sample suggest a promising future for it in biomedical applications.

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Photo-electrochemical properties of p-type AgCoO2 prepared by low temperature method

Cited by 19 publications

References 24 publications

Phase pure rhombohedral R3¯m$R\bar{3}m$ AgCoO₂ delafossite: Rietveld, selected area electron diffraction, X‐ray photoemission spectroscopy, and magnetic studies

Phase pure rhombohedral R3¯m$R\bar{3}m$ AgCoO₂ delafossite: Rietveld, selected area electron diffraction, X‐ray photoemission spectroscopy, and magnetic studies

Preparation and Characterization of New Modified System: Polyaniline/1.5-Naphtalene Disulfonic Acid as Novel Photocatalyst in the H2 Production

A facile novel synthesis of AgCuO2 delafossite nanoparticles and evaluation of their antimicrobial activity

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Photo-electrochemical properties of p-type AgCoO2 prepared by low temperature method

Cited by 19 publications

References 24 publications

Phase pure rhombohedral R3¯m$R\bar{3}m$ AgCoO2 delafossite: Rietveld, selected area electron diffraction, X‐ray photoemission spectroscopy, and magnetic studies

Phase pure rhombohedral R3¯m$R\bar{3}m$ AgCoO2 delafossite: Rietveld, selected area electron diffraction, X‐ray photoemission spectroscopy, and magnetic studies

Preparation and Characterization of New Modified System: Polyaniline/1.5-Naphtalene Disulfonic Acid as Novel Photocatalyst in the H2 Production

A facile novel synthesis of AgCuO2 delafossite nanoparticles and evaluation of their antimicrobial activity

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Product

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Phase pure rhombohedral R3¯m$R\bar{3}m$ AgCoO₂ delafossite: Rietveld, selected area electron diffraction, X‐ray photoemission spectroscopy, and magnetic studies

Phase pure rhombohedral R3¯m$R\bar{3}m$ AgCoO₂ delafossite: Rietveld, selected area electron diffraction, X‐ray photoemission spectroscopy, and magnetic studies