A mechanochemical route for the synthesis of VNbO<sub>5</sub> and its structural re-investigation using structure solution from powder diffraction data

Valentoni, Antonio; Barra, Paolo; Senes, Nina; Mulas, G.; Pistidda, Claudio; Bednarčı́k, J.; Torre, Francesco; Garroni, Sebastiano; Enzo, Stefano

doi:10.1039/c9dt01236b

Cited by 3 publications

(1 citation statement)

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“…In recent years, increasing attention has been paid to the synergistic effects of bimetallic oxides. − Studies have shown that the active substances can be obtained in situ by the addition of bimetallic oxides during the ball milling and reaction process. − For example, MgH 2 –Ni 3 (VO 4 ) 2 , prepared by Zang et al, could generate Mg 2 Ni and V 2 O 3 in situ after dehydrogenation, and it could release 4.5 wt % hydrogen at 250 °C within 30 min and absorb 2.3 wt % hydrogen at 50 °C within 60 min. Moreover, in the subsequent reaction process, Mg 2 Ni and V 2 O 3 remain stable and play a synergistic role.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effect of a Facilely Synthesized MnV₂O₆ Catalyst on Improving the Low-Temperature Kinetic Properties of MgH₂

et al. 2022

ACS Appl. Mater. Interfaces

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While magnesium hydride (MgH2) has drawn considerable attention as a promising hydrogen storage material, it suffers from sluggish kinetics and high desorption temperature, hindering potential applications. Herein, we show that the hydrogen desorption kinetics of MgH2 can be significantly improved using bimetallic oxide MnV2O6 as the catalyst. A MgH2–MnV2O6 composite was prepared by a high-energy ball milling method. The results showed that the MgH2–MnV2O6 composite can release 5.57 wt % hydrogen within 10 min under 250 °C. The dehydrogenated MgH2–MnV2O6 sample can absorb 3.09 wt % hydrogen within 10 min under 50 °C. Notably, the reversible hydrogen storage property did not degrade at least within 100 cycles, showing excellent cycle stability. X-ray diffraction and transmittance electron microscopy measurements revealed that MnV alloy and V2O3 phases were formed during the ball milling process, leading to the synergistic catalytic effect. We argue that the bimetallic MnV alloy plays key catalytic roles in this system because MnV alloy can promote the fracture of the H–H and Mg–H bonds, significantly improving the hydrogen storage kinetics and low-temperature reversible hydrogen storage performance of MgH2.

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Section: Introductionmentioning

confidence: 99%

Synergistic Effect of a Facilely Synthesized MnV₂O₆ Catalyst on Improving the Low-Temperature Kinetic Properties of MgH₂

et al. 2022

ACS Appl. Mater. Interfaces

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Solid Solution (V_1–xNb_x)OPO₄ (0.1 ≤ x < 1.0): A Combined Experimental and Theoretical Study to Understand Substitution Effects on the Structure, Bonding, and Catalytic Behavior

Kunz,

Glaum,

Titlbach

et al. 2024

Chem. Mater.

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Single-phase synthesis of α II -VOPO 4 has been achieved by meticulous control of the seed formation and water vapor. The solid solution (V 1−x Nb x )OPO 4 (0.1 ≤ x < 1.0) (α II -VOPO 4 /MoOPO 4 -type structure) has been obtained by solution combustion synthesis. It is thermodynamically stable only for x ≥ 0.8; for smaller x values, equilibration leads to β-VOPO 4 and (V 0.2 Nb 0.8 )OPO 4 . With increasing niobium content, the a-axis of the tetragonal unit cell increases, while the c-axis decreases. Calculated model structures (density functional theory (DFT) using CRYSTAL17, PW1PW hybrid functional, and D3 dispersion correction) suggest that the dopant Nb 5+ cations lead to less distorted [(V V ≡ O)O 4 O] octahedra in their vicinity. The experimental vibrational (IR, Raman) and electronic ultraviolet/visible (UV/vis) spectra show considerable variation with composition, perfectly reflecting the calculated dopant effects. These results suggest that within the solid solution [(V V ≡ O)O 4 O] and [(Nb V ≡ O)O 4 O] polyhedra are present as in the boundary phases in addition to just one type of geometrically slightly modified [(V V ≡ O)O 4 O] and [(Nb V ≡ O)O 4 O] groups. The continuous variation of lattice parameters with x is related to the concentration of these four types of polyhedra. Reversible reduction (hydrogen) and reoxidation (air) of (V 1−x Nb x )OPO 4 are possible at 400 °C. Thus, (V 0.5 V Nb 0.5 V )OPO 4 yields (V 0.5 III Nb V )O 0.5 PO 4 , which decomposes at 800 °C in a sealed ampule to V III PO 4 and Nb V OPO 4 .

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In situ synchrotron radiation investigation of V₂O₅–Nb₂O₅ metastable compounds: transformational kinetics at high temperatures with a new structural solution for the orthorhombic V₄Nb₂₀O₆₀ phase

et al. 2020

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A mechanochemical route for the synthesis of VNbO₅ and its structural re-investigation using structure solution from powder diffraction data

Abstract: VNbO5 with a revised space group P212121 versus Pnma has been successfully synthesized by a solvent-free mechanochemical route.

Cited by 3 publications

References 35 publications

Synergistic Effect of a Facilely Synthesized MnV₂O₆ Catalyst on Improving the Low-Temperature Kinetic Properties of MgH₂

Synergistic Effect of a Facilely Synthesized MnV₂O₆ Catalyst on Improving the Low-Temperature Kinetic Properties of MgH₂

Solid Solution (V_1–xNb_x)OPO₄ (0.1 ≤ x < 1.0): A Combined Experimental and Theoretical Study to Understand Substitution Effects on the Structure, Bonding, and Catalytic Behavior

In situ synchrotron radiation investigation of V₂O₅–Nb₂O₅ metastable compounds: transformational kinetics at high temperatures with a new structural solution for the orthorhombic V₄Nb₂₀O₆₀ phase

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A mechanochemical route for the synthesis of VNbO5 and its structural re-investigation using structure solution from powder diffraction data

Abstract: VNbO5 with a revised space group P212121 versus Pnma has been successfully synthesized by a solvent-free mechanochemical route.

Cited by 3 publications

References 35 publications

Synergistic Effect of a Facilely Synthesized MnV2O6 Catalyst on Improving the Low-Temperature Kinetic Properties of MgH2

Synergistic Effect of a Facilely Synthesized MnV2O6 Catalyst on Improving the Low-Temperature Kinetic Properties of MgH2

Solid Solution (V1–xNbx)OPO4 (0.1 ≤ x < 1.0): A Combined Experimental and Theoretical Study to Understand Substitution Effects on the Structure, Bonding, and Catalytic Behavior

In situ synchrotron radiation investigation of V2O5–Nb2O5 metastable compounds: transformational kinetics at high temperatures with a new structural solution for the orthorhombic V4Nb20O60 phase

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A mechanochemical route for the synthesis of VNbO₅ and its structural re-investigation using structure solution from powder diffraction data

Synergistic Effect of a Facilely Synthesized MnV₂O₆ Catalyst on Improving the Low-Temperature Kinetic Properties of MgH₂

Synergistic Effect of a Facilely Synthesized MnV₂O₆ Catalyst on Improving the Low-Temperature Kinetic Properties of MgH₂

Solid Solution (V_1–xNb_x)OPO₄ (0.1 ≤ x < 1.0): A Combined Experimental and Theoretical Study to Understand Substitution Effects on the Structure, Bonding, and Catalytic Behavior

In situ synchrotron radiation investigation of V₂O₅–Nb₂O₅ metastable compounds: transformational kinetics at high temperatures with a new structural solution for the orthorhombic V₄Nb₂₀O₆₀ phase