Synthesis, characterization and thermal analysis of K2M(SO4)2·6H2O (M = Mg, Co, Cu)

Souamti, Ahmed; Zayani, L.; Palomino, Julián Morales; Cruz-Yusta, Manuel; Vicente, Cristovão; Hassen‐Chehimi, D. Ben

doi:10.1007/s10973-015-4779-6

Cited by 29 publications

(4 citation statements)

References 13 publications

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“…Fourier transform infrared spectroscopy (FTIR) studies in Figure 2c were used to qualitatively analyze the presence of SO 4 2− groups. [ 24 ] The stretching vibrations of the water molecule are located in 3000–3600 cm −1 . The broad vibrational band observed around 3436 cm −1 is attributed to the symmetric stretching mode of water molecule.…”

Section: Resultsmentioning

confidence: 99%

Incorporation of Sulfate Anions and Sulfur Vacancies in ZnIn₂S₄ Photoanode for Enhanced Photoelectrochemical Water Splitting

Gao

Meng

et al. 2021

Advanced Energy Materials

116

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friendly properties. [6] However, due to its severe bulk carrier recombination, unfavorable carrier transportation, and sluggish surface OER dynamics, the PEC performance of bare ZnIn 2 S 4 photoanode is still not satisfactory.Various strategies have been developed to enhance the PEC performance of ZnIn 2 S 4 , such as morphology engineering, constructing heterojunctions, and coating surface co-catalysts, etc. [7][8][9] Among them, decorating surface cocatalysts has been considered as an effective strategy to promote surface water oxidation kinetics of pristine ZnIn 2 S 4 . However, the integration of water-oxidation cocatalysts with PEC photoanodes has been limited to metal-based materials, such Co-Pi, FeCoO x , and FeOOH. [10][11][12][13][14][15] The cocatalysts containing metallic ions tend to be toxic and expensive, which could limit their further applications. In addition, these cocatalysts may cause light absorption attenuation and increased charge recombination due to the large thickness/dimension of cocatalysts and additional interface defects between cocatalysts and photo anodes. Recently, nonmetallic anionic groups, such as phosphate (PO 4 3− ), selenate (SeO 4 2− ), and sulfate (SO 4 2− ), have emerged as alternatives to boost water oxidation ability. [16][17][18] These nonmetallic groups could optimize the electronic structure of active sites, regulate the adsorption of intermediates to reduce OER overpotential, and promote the surface carrier transfer. Particularly, the SO 4 2− group can break the adsorption-energy scaling relation between OH* and OOH* (reaction intermediates) and decrease the OER overpotential. [17] Accordingly, engineering ZnIn 2 S 4 with SO 4 2− groups is a promising strategy to improve its surface reaction kinetics. However, the introduction of nonmetallic anionic groups usually relies on a direct mixing method or external addition, which leads to weak chemical interaction and thus decreases the effectiveness and durability of the resultant materials. [17] In contrast, in situ introducing SO 4 2− anionic groups into ZnIn 2 S 4 to induce strong bonding between anions and metal atoms is expected to remarkably facilitate solar water oxidation.As a kind of intrinsic defect for metal sulfide, sulfur vacancies (S v ) have the ability to adjust the electronic structure of metal sulfide, leading to optimization of the adsorption free energy and also improvement of the conductivity. [19,20] S v can be divided into bulk S v and surface S v according to their spatial Severe charge recombination and slow surface water oxidation kinetics seriously limit the practical application of ZnIn 2 S 4 photoanodes for photo electrochemical water splitting. Herein, an in situ strategy to introduce sulfate (SO 4 2− ) anions and controlled bulk sulfur vacancies (S v ) into a ZnIn 2 S 4 photoanode is developed, and its PEC performance is remarkably enhanced, achieving a photocurrent density of 3.52 mA cm −2 at 1.23 V versus reversible hydrogen electrode (V RHE ) and negatively shifted onset potential of 0....

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Section: Resultsmentioning

confidence: 99%

Incorporation of Sulfate Anions and Sulfur Vacancies in ZnIn₂S₄ Photoanode for Enhanced Photoelectrochemical Water Splitting

Gao

Meng

et al. 2021

Advanced Energy Materials

116

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“…It can be seen from the DTA curve of Figure 1 that each mass loss is accompanied by endothermic peaks. Analyzing the degradation processes of samples AMgSH:Ag, ANiSH:Ag, and ANiSH:B, shown in Figure 1a− Comparing the initial degradation temperature, we observed an increase in the samples ANiSH:B and ANiSH:Ag, with temperature gains of 39 and 36 °C, respectively, while the dehydration temperature of the pure crystal (NH 4 ) 2 Ni(SO 4 ) 2 • 6H 2 O was 96 °C, as reported by Pacheco et al 7 For sample AMgSH:Ag, the temperature gain was 24 °C compared to the similar pure crystal, which is 70 °C, as reported by Souamti et al 20 Raman measurements in the range of 100−3500 cm −1 were performed in all samples, as shown in Figure 2, using an excitation laser of 632.8 nm. These crystals have 234 normal vibrational modes, considering the structure of SO 4 , NH 4 , H 2 O, and M(H 2 O) 6 groups, including three acoustic modes, being 1A u + 2B u .…”

Section: Resultsmentioning

confidence: 99%

“…Comparing the initial degradation temperature, we observed an increase in the samples ANiSH:B and ANiSH:Ag, with temperature gains of 39 and 36 °C, respectively, while the dehydration temperature of the pure crystal (NH 4 ) 2 Ni(SO 4 ) 2 ·6H 2 O was 96 °C, as reported by Pacheco et al For sample AMgSH:Ag, the temperature gain was 24 °C compared to the similar pure crystal, which is 70 °C, as reported by Souamti et al…”

Section: Resultsmentioning

confidence: 99%

Synthesis, Thermal Analysis, Spectroscopic Properties, and Degradation Process of Tutton Salts Doped with AgNO₃ or H₃BO₃

et al. 2023

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In this work, we synthesized and studied the spectroscopic properties of (NH 4 ) 2 (SO 4 ) 2 Y(H 2 O) 6 (Y = Ni, Mg) crystals doped with AgNO 3 or H 3 BO 3 . These crystals constitute a series of hexahydrated salts known as Tutton salts. We investigated the influence of dopants on the vibrational modes of the tetrahedral ligands NH 4 and SO 4 , octahedral complexes Mg(H 2 O) 6 and Ni(H 2 O) 6 , and H 2 O molecules present in these crystals through Raman and infrared spectroscopies. We were able to identify bands that are attributed to the presence of Ag and B dopants, as well as band shifts caused by the presence of these dopants in the crystal lattice. A detailed study of the crystal degradation processes was performed by thermogravimetric measurements, where there was an increase in the initial temperature of crystal degradation due to the presence of dopants in the crystal lattice. Raman spectroscopy of the crystal residues after the thermogravimetric measurements helped us to elucidate the degradation processes occurring after the crystal pyrolysis process.

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“…The experimental and theoretical composition was depicted as in Table I which confirms the chemically referred constitution of MOH crystals. [22][23][24][25][26][27] UV-Vis NIR spectral studies, photoluminescence(PL) studies.-The single crystals are particularly utilized for optically specified device utilization. The transmittance attribute inter-related to the structural, band-gap and electrical properties of materials.…”

Section: Characterisationsmentioning

confidence: 99%

Synthesis, Studies of Inorganic Class of Mohrite (MOH) Crystals for Electrical, Electronic, Photonic, Phase Matching and Sensor Utilities by Theory and Practice

K.,

R.,

et al. 2024

ECS J. Solid State Sci. Technol.

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The high-quality single crystals of Mohrite (MOH) with dimensions 7 x 6 x 3 mm3 were productively grown-up by the customary solution growth modus-operandi. The fully grown crystals were focused to the appropriate structural, optical and electrical investigations. The monoclinic nature of the specimen with P21/c as the space group and lattice parameters are a as 6.2385Å, b as 12.6076Å, c as 9.2655 Å and beta is 106.526o . The crystalline structural authentication with single crystal XRD analysis and compared the same with software based associated results. FITR spectra reveal the vibrational modes of as grown crystals. Optical absorption spectral data divulges that the as-grown crystalline sample has higher optical transparent nature in the visible-NIR region. Photoluminescence intensity is remarkably enriched, shows high crystallinity of MOH. The results of UV, PL, electrical and photo conductivity, SEM, theoretical studies suggest MOH in photonic utility and device appliances especially in UV filters and in electronic filters, room temperature based sensor study for MOH is enabled and reported for red LED based work.

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Synthesis, characterization and thermal analysis of K2M(SO4)2·6H2O (M = Mg, Co, Cu)

Cited by 29 publications

References 13 publications

Incorporation of Sulfate Anions and Sulfur Vacancies in ZnIn₂S₄ Photoanode for Enhanced Photoelectrochemical Water Splitting

Incorporation of Sulfate Anions and Sulfur Vacancies in ZnIn₂S₄ Photoanode for Enhanced Photoelectrochemical Water Splitting

Synthesis, Thermal Analysis, Spectroscopic Properties, and Degradation Process of Tutton Salts Doped with AgNO₃ or H₃BO₃

Synthesis, Studies of Inorganic Class of Mohrite (MOH) Crystals for Electrical, Electronic, Photonic, Phase Matching and Sensor Utilities by Theory and Practice

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Synthesis, characterization and thermal analysis of K2M(SO4)2·6H2O (M = Mg, Co, Cu)

Cited by 29 publications

References 13 publications

Incorporation of Sulfate Anions and Sulfur Vacancies in ZnIn2S4 Photoanode for Enhanced Photoelectrochemical Water Splitting

Incorporation of Sulfate Anions and Sulfur Vacancies in ZnIn2S4 Photoanode for Enhanced Photoelectrochemical Water Splitting

Synthesis, Thermal Analysis, Spectroscopic Properties, and Degradation Process of Tutton Salts Doped with AgNO3 or H3BO3

Synthesis, Studies of Inorganic Class of Mohrite (MOH) Crystals for Electrical, Electronic, Photonic, Phase Matching and Sensor Utilities by Theory and Practice

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Incorporation of Sulfate Anions and Sulfur Vacancies in ZnIn₂S₄ Photoanode for Enhanced Photoelectrochemical Water Splitting

Incorporation of Sulfate Anions and Sulfur Vacancies in ZnIn₂S₄ Photoanode for Enhanced Photoelectrochemical Water Splitting

Synthesis, Thermal Analysis, Spectroscopic Properties, and Degradation Process of Tutton Salts Doped with AgNO₃ or H₃BO₃