Synthesis and characterizations of highly crystallized α′-NaV2O5 needles prepared by a hydrothermal process

Hu, Fang; Ming, Xing; Chen, Gang; Wang, Chunzhong; Li, Ang; Li, Jixue

doi:10.1016/j.jallcom.2009.01.097

Cited by 13 publications

(12 citation statements)

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“…The layered structure provides a fast passage for the de-intercalation of sodium ions; thus, NaV 2 O 5 may be used as an electrode material. These results agree well with those of previous research works [5,6,16,18,24]. VO5 units with the same underlying orientation bond with each other along the a axis by sharing one oxygen atom to form a bridge unit.…”

Section: Structural Characterizationsupporting

confidence: 93%

“…NaV 2 O 5 is one of the typical layered alkali vanadates of orthorhombic structure. In the NaV 2 O 5 structure, Na-ions are located in the interlayer space [5][6][7]. NaV 2 O 5 initially drew much attention for its spin-Peierls property [8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…NaV 2 O 5 can be prepared by a solid-state reaction process, but this process requires a reaction temperature of 650 • C and a long reaction time (more than two days) [20][21][22][23]. In order to lower the reaction temperature, some hydrothermal methods have been developed [5,6,[16][17][18]24]. In the hydrothermal methods, V 2 O 5 , NH 4 VO 3 , and NaVO 3 are usually used as vanadium resources, NaOH and Na 2 CO 3 are usually used as sodium resources, and NH 2 OH·HCl, ethylene diamine tetraacetic acid (EDTA), H 2 C 2 O 4 , and Na 2 C 2 O 4 are usually used as reducing agents.…”

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confidence: 99%

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A Novel Process for the Synthesis of NaV2O5 Mesocrystals from Alkaline-Stripped Vanadium Solution via the Hydrothermal Hydrogen Reduction Method

Zhang

Bao

et al. 2019

Minerals

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NaV2O5 mesocrystals were successfully synthesized from an alkaline-stripped pentavalent vanadium solution through a novel hydrothermal hydrogen reduction process. The optimal conditions for the hydrogen partial pressure, reaction temperature, initial solution pH value, and reaction time for the pure-phase NaV2O5 synthesis were ascertained to be 4 MPa, 200 °C, 4.0, and 2 h, respectively. The synthesis time (only 2 h) was greatly shortened, by nine times, compared with the most time-saving (18 h) hydrothermal process at present. X-ray diffraction (XRD) analysis revealed that the as-prepared powders demonstrated a typical layered orthorhombic structure of NaV2O5. The purity of the as-prepared NaV2O5 reached up to 99.98%. An electrochemical test showed that the as-prepared NaV2O5 has a potential application in sodium ion batteries. According to scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses, the as-prepared NaV2O5 powders were identified to have rod-like mesocrystals consisting of small rods which preferentially grow along the (010) direction. Furthermore, the phase transformation mechanism and crystal growth mechanism in NaV2O5 preparation were discussed systematically, based on which the synthesis mechanism of NaV2O5 was proposed as pentavalent vanadates pre-sedimentation, hydrogen reduction with dehydration, sodium ions insertion, and finally self-assembly oriented attachment. The synthesis process is characterized as time-saving and low-cost, and thus it may have great application prospects.

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Section: Structural Characterizationsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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A Novel Process for the Synthesis of NaV2O5 Mesocrystals from Alkaline-Stripped Vanadium Solution via the Hydrothermal Hydrogen Reduction Method

Zhang

Bao

et al. 2019

Minerals

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“…In fact, AxV6O15 are in a mixed-valence state of V 4+ and V 5+ , so that in the case of NaV6O15 the formal valence is V 4.83+ [35], whereas α-NaV2O5 and NaV3O8 has an average state of vanadium of 4.5 [36] and 4.93, respectively [24].…”

Section: Discussionmentioning

confidence: 99%

Catalytic behavior of NaV6O15 bronze for partial oxidation of hydrogen sulfide

et al. 2014

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ElsevierSoriano Rodríguez, MD.; Rodriguez-Castellon, E.; Garcia-Gonzalez, E.; López Nieto, JM. (2014). Catalytic behavior of NaV6O15 bronze for partial oxidation of hydrogen sulfide. Catalysis AbstractNa-containing V2O5 materials have been prepared hydrothermally from gels with Na/V ratios of 0.02 to 0.34, and calcined at 500ºC. The calcined samples have been characterized and tested as catalysts in the partial oxidation of H2S to elemental sulfur.At low Na-contents, V2O5 and NaV6O15 bronze are formed, with the NaV6O15/V2O5 ratio increasing with the Na-content. Pure NaV6O15 bronze is mainly formed from gels containing a Na/V ratio of 0.18. However, NaV6O15 and NaV3O8 bronzes are formed at from gels with Na/V ratio higher than 0.35. NaV6O15 based catalyst shows high conversion for the oxidation of H2S with a high selectivity into elemental sulfur. These catalysts are more active and stable than pure or Na-doped V2O5 catalysts. V4O9 is observed in used catalysts derived from pure and Na-doped V2O5 and materials containing NaV6O15/V2O5 mixtures. However, no changes in the NaV6O15 crystalline structure are observed in pure and NaV6O15/V2O5 mixtures catalysts. Accordingly, NaV6O15 crystalline phase is stable for several hours of catalysis at a difference with V2O5. The active sites in V-containing vanadium catalysts are probably V 5+ -O-V 4+ pairs as proposed for V4O9 crystalline phase. The best catalytic performances were achieved on V2O5-NaV6O15 mixtures which are transformed to V4O9-NaV6O15 mixtures during the catalytic tests. These catalytic results could be due to the intrinsic physical properties of both phases but also because of the optimal dispersion.Keywords: NaV 6 O 15 bronze, V 2 O 5 , V 4 O 9 , selective oxidation of hydrogen sulfide to sulfur, Na-doped vanadium oxide catalyst 3

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“…25,26 The common nanobelt-shaped and needle-like particles have been prepared by several techniques, such as solid-state reaction 27 and hydrothermal methods. 28 It was reported that the presence of F − is critical for the formation of NaV 2 O 5 needles along the <0 1 0> axis. 28 In this paper, we present a systematic investigation of the formation of L-shaped NaV 2 O 5 crystals by a facile hydrothermal synthesis route.…”

Section: Introductionmentioning

confidence: 99%

NaV₂O₅ crystals of a right-angle-shaped nanostructure assembly

Ren

Fan

et al. 2014

CrystEngComm

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Synthesis and characterizations of highly crystallized α′-NaV2O5 needles prepared by a hydrothermal process

Cited by 13 publications

References 17 publications

A Novel Process for the Synthesis of NaV2O5 Mesocrystals from Alkaline-Stripped Vanadium Solution via the Hydrothermal Hydrogen Reduction Method

A Novel Process for the Synthesis of NaV2O5 Mesocrystals from Alkaline-Stripped Vanadium Solution via the Hydrothermal Hydrogen Reduction Method

Catalytic behavior of NaV6O15 bronze for partial oxidation of hydrogen sulfide

NaV₂O₅ crystals of a right-angle-shaped nanostructure assembly

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Synthesis and characterizations of highly crystallized α′-NaV2O5 needles prepared by a hydrothermal process

Cited by 13 publications

References 17 publications

A Novel Process for the Synthesis of NaV2O5 Mesocrystals from Alkaline-Stripped Vanadium Solution via the Hydrothermal Hydrogen Reduction Method

A Novel Process for the Synthesis of NaV2O5 Mesocrystals from Alkaline-Stripped Vanadium Solution via the Hydrothermal Hydrogen Reduction Method

Catalytic behavior of NaV6O15 bronze for partial oxidation of hydrogen sulfide

NaV2O5 crystals of a right-angle-shaped nanostructure assembly

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NaV₂O₅ crystals of a right-angle-shaped nanostructure assembly