Physical and photoelectrochemical properties of the spinel LiMn2O4 and its application in photocatalysis

Douafer, S.; Lahmar, H.; Benamira, M.; Rekhila, G.; Trari, M.

doi:10.1016/j.jpcs.2018.02.053

Cited by 50 publications

(14 citation statements)

References 29 publications

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“…Spinel structure is one variant of the cubic structure with certain crystal planes such as (111), (220), (311), (400), (331), (422), (511), (333), (440), (531) and (620) [14]. The spinel structure in this system has Fd-3m space group [13]. The X-ray diffraction pattern in Figure 1 shows that the spinel structure has not been formed at 50 and 70 hours of holding time.…”

Section: Resultsmentioning

confidence: 99%

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FORMATION OF SPINEL STRUCTURE IN SYNTHESIS PROCESS OF Li1.37Mn2O4 USING HYDROTHERMAL METHOD

Purawiardi

Wigayati

2018

jsmi

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FORMATION OF SPINEL STRUCTURE IN SYNTHESIS PROCESS OF Li1.37Mn2O4 USING HYDROTHERMAL METHOD. Li1.37Mn2O4 is one form of Li1+xMn2O4 which is engineered from LiMn2O4 phase which is commonly used as a lithium cathode active ingredient. The crucial thing from Li1.37Mn2O4 synthesis is the spinel structure that is formed. This study aims to observe when the spinel structure of Li1.37Mn2O4 starts and when the transformation from a tetragonal structure into spinel occurs. The raw materials used are tetragonal LiOH and tetragonal MnO2. The synthesis was carried out using a hydrothermal method with a temperature of 200 oC with a variation of holding times of 50, 70, 90 and 110 hours. Observation of spinel structure was carried out using XRD and TEM. The results obtained were at the holding times of 50 and 70 hours, the spinel structure had not been formed. The spinel structure begins to form at 90 hours holding time which also indicates that the transformation from the tetragonal structure to spinel occurs at such holding time. The result of a 90-hour holding time is a regular spinel structure but there are still many Mn and Mn-O –based impurities. While the results of the 110-hour holding time produce a perfect yet irregular transformation of the spinel structure.

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Section: Resultsmentioning

confidence: 99%

“…A crucial problem in this synthesis is when the spinel structure begins to form and when the transformation of the tetragonal structure into spinel begins to occur. The spinel structure has an indication of having a Fd-3m space group [13]. Therefore, controlling the formation of Fd-3m space group is the main objective of this synthesis.…”

Section: Introductionmentioning

confidence: 99%

FORMATION OF SPINEL STRUCTURE IN SYNTHESIS PROCESS OF Li1.37Mn2O4 USING HYDROTHERMAL METHOD

Purawiardi

Wigayati

2018

jsmi

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“…Nowadays, the solar-responsive spinel photocatalyst has been presented as a potential material for application in wastewater treatments [35]. Besides, oxyspinels have been studied as excellent photocatalytic degradation for methylene blue [36,37] and methyl orange [38]. Meanwhile, several oxyspinels were prepared from inorganic anions (carbonate, nitrate, phosphate, and sulfate) pillared A 2+ -A 3+ layered double hydroxides and followed by a thermal process that they performed the improved catalytic activities [39][40][41][42][43][44][45][46].…”

Section: Introductionmentioning

confidence: 99%

An improved method for high photocatalytic performance of ZnAl2O4 spinel derived from layered double hydroxide precursor

Putra

2020

SN Appl. Sci.

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A spinel structure of zinc aluminate (ZnAl 2 O 4) particles provides a prospective material for photocatalytic applications. In this work, zinc aluminate spinel was prepared by an anion-exchange method derived from layered double hydroxides (LDHs) followed by thermal treatment. The mechanism, photoactivity, and effects of both anion substitute and temperature have been investigated. The chemical composition, morphologies, phase structures, porous structures and photocatalytic properties of samples were analyzed using thermogravimetric analysis, scanning electron microscopy, energy-dispersive X-ray spectroscopy, powder X-ray diffraction, gas sorption analysis, and ultraviolet-visible spectroscopy in detail. The results of mesoporous α-ZnAl 2 O 4 indicate that average crystallite size, total pore volume, and BET surface area obtain 9.3 nm, 0.337 cm 3 /g, and 206.13 m 2 /g, respectively. Moreover, zinc aluminate spinel shows well phase after heating at 700 °C and LDHs structures were completely collapsed. The photocatalytic performances of α-ZnAl 2 O 4 have been applied in p-nitrophenol reduction under visible light irradiation and required time at least 9 min. Finally, the new improved method constructs an excellent material for pretreatment of liquid pollutants containing high-level concentration at rapid treatment time.

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“…The photocatalytic process of our research program aims to study the photo-dissociation of water by the illumination of a suspension of semiconductor oxides (SC). Photocatalysis is booming due to its many applications in the environmental and energy field [2][3][4][5][6]. The development of stable and active photocatalysts under solar irradiation is a major challenge.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Evolution of Hydrogen on CuFe2O4

Lahmar

Benamira

Messaadia

et al. 2020

Springer Proceedings in Energy

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We investigated the technical feasibility of photochemical hydrogen release based on CuFe 2 O 4 powder dispersion in an aqueous electrolyte containing a reducing agent (S 2 O 3 −2). The oxide combines an average resistance to corrosion and an optimum inter-referred band Eg of 1.67 eV. The intercalation of a small amount of oxygen should be accompanied by partial oxidation of Cu + to Cu 2+ involving a p-type semi-conductivity. The oxidation S 2− inhibits the photo-corrosion, and the evolution of H 2 increases in parallel with the formation of polysulfides. Most of H 2 is produced when p-CuFe 2 O 4 is connected to n-ZnO formed in situ. The release of H 2 is mainly on CuFe 2 O 4, whereas, the oxidation of S 2− takes place on the surface of ZnO and the hetero-system CuFe 2 O 4 /ZnO is optimized with respect to certain physical parameters. The photoelectrochemical production of H 2 is a multi-step process whose decisive step is the arrival of electrons at the interface due to their low mobility. Remarkable performance with a rate of 6.74 (μmol g −1 min −1) cm 3 h −1 hydrogen evolution in 0.1 M S 2 O 3 −2 (pH 13) is recorded.

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Physical and photoelectrochemical properties of the spinel LiMn2O4 and its application in photocatalysis

Cited by 50 publications

References 29 publications

FORMATION OF SPINEL STRUCTURE IN SYNTHESIS PROCESS OF Li1.37Mn2O4 USING HYDROTHERMAL METHOD

FORMATION OF SPINEL STRUCTURE IN SYNTHESIS PROCESS OF Li1.37Mn2O4 USING HYDROTHERMAL METHOD

An improved method for high photocatalytic performance of ZnAl2O4 spinel derived from layered double hydroxide precursor

Photocatalytic Evolution of Hydrogen on CuFe2O4

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