Synthesis, Characterization, and Magnetic Properties of A2Co2Fe(VO4)3 (A = Ag or Na) Alluaudite-Type Vanadates

Hadouchi, Mohammed; Assani, Abderrazzak; Saadi, Mohamed; Lahmar, Abdelilah; Marssi, M. El; Sajieddine, M.; Ammari, Lahcen El

doi:10.1007/s10948-018-4964-5

Cited by 5 publications

(4 citation statements)

References 44 publications

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“…11−17 Apart from promising electrochemical activity, the ability of alluaudite-like structures to accommodate a wide selection of transition metals can render additional attractive features like electronic and/or ionic conductivity, magnetism, catalytic activity; in addition, iron-phosphate-based alluaudite shows high thermal stability. 15,19 Attracted by the numerous possibilities with alluaudites, our previous work unveiled phosphate-based NaMnFe 2 (PO 4 ) 3 as a superior Na + conductor in addition to its role as potential 2.9 V cathode for Na-ion batteries. 21 Dwelling further on the rich phosphate-based alluaudite family, we hereby report the hitherto unknown NaCo-Fe 2 (PO 4 ) 3 by energy-scrooge solution combustion synthesis.…”

Section: ■ Introductionmentioning

confidence: 98%

“…Keeping the phosphate-based systems on anvil, our group has recently demonstrated few successful cases of water electrolysis by the conventional cathodes. , This has further prompted us to search for suitable cathodes that might exhibit both electrochemical and electrocatalytic performance. Among various low cost and sustainable cathodes, “alluaudite” family of synthetic minerals with its rich crystal chemistry has carved out a niche for itself during the past few years. − Basically, the mineral originally known as (Na, Ca)Mn(Fe, Mg) 2 (PO 4 ) 3 phosphates was first reported by Moore having the general structural formula X(2)X(1)M(1)M(2) 2 (PO 4 ) 3 (X-eight coordinated large cations: Na + , Ca 2+ , K + , and M-octahedral cations) . The general open framework and vacancy at X sites facilitate easy alkali–ion (de)intercalation in these alluaudites, classifying them among various potential promising polyanionic electrode materials for secondary batteries. , The subsequent study further extended the anionic part to many sulfates, arsenates, vanadate, and molybdates with alluring properties. − Apart from promising electrochemical activity, the ability of alluaudite-like structures to accommodate a wide selection of transition metals can render additional attractive features like electronic and/or ionic conductivity, magnetism, catalytic activity; in addition, iron-phosphate-based alluaudite shows high thermal stability. , Attracted by the numerous possibilities with alluaudites, our previous work unveiled phosphate-based NaMnFe 2 (PO 4 ) 3 as a superior Na + conductor in addition to its role as potential 2.9 V cathode for Na-ion batteries …”

Section: Introductionmentioning

confidence: 99%

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Alluaudite NaCoFe₂(PO₄)₃ as a 2.9 V Cathode for Sodium-Ion Batteries Exhibiting Bifunctional Electrocatalytic Activity

2019

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Figure S1. The electrocatalytic activity studied under Linear sweep voltammetry (LSV). (a) Koutecky-Levich plots (J −1 versus ω −1/2 , J is the current density in mA cm -2 and ω is the rotating speed in rpm -1/2 ). (b) LSV for NaCoFe 2 (PO 4 ) 3 at different rotating speed in O 2 saturated 0.1 M KOH electrolyte. (c) ORR stability performance of NaCoFe 2 (PO 4 ) 3 shown over 10 hours. (d) Number of electron transfer as calculated from K-L plot during the ORR process in potential window of 0.25 -0.50 V.

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Section: ■ Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Alluaudite NaCoFe₂(PO₄)₃ as a 2.9 V Cathode for Sodium-Ion Batteries Exhibiting Bifunctional Electrocatalytic Activity

2019

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“…On the other hand, the main characteristic peaks of MgO are presented as 1088 and 2884 cm −1 [72]. Furthermore, the bands of VO4 are found in 820 cm −1 and 880 cm −1 [73].…”

Section: Raman Spectroscopymentioning

confidence: 93%

Magnesium Ortho-Vanadate/Magnesium Oxide/Graphene Oxide Embedded through Cellulose Acetate-Based Films for Wound Healing Applications

et al. 2023

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A multifunctional nano-films of cellulose acetate (CA)/magnesium ortho-vanadate (MOV)/magnesium oxide/graphene oxide wound coverage was fabricated. Through fabrication, different weights of the previously mentioned ingredients were selected to receive a certain morphological appearance. The composition was confirmed by XRD, FTIR, and EDX techniques. SEM micrograph of Mg3(VO4)2/MgO/GO@CA film depicted that there was a porous surface with flattened rounded MgO grains with an average size of 0.31 µm was observed. Regarding wettability, the binary composition of Mg3(VO4)2@CA occupied the lowest contact angle of 30.15 ± 0.8o, while pure CA represents the highest one at 47.35 ± 0.4°. The cell viability % amongst the usage of 4.9 µg/mL of Mg3(VO4)2/MgO/GO@CA is 95.77 ± 3.2%, while 2.4 µg/mL showed 101.54 ± 2.9%. The higher concentration of 5000 µg/mL exhibited a viability of 19.23%. According to optical results, the refractive index jumped from 1.73 for CA to 1.81 for Mg3(VO4)2/MgO/GO@CA film. The thermogravimetric analysis showed three main stages of degradation. The initial temperature started from room temperature to 289 °C with a weight loss of 13%. On the other hand, the second stage started from the final temperature of the first stage and end at 375 °C with a weight loss of 52%. Finally, the last stage was from 375 to 472 °C with 19% weight loss. The obtained results, such as high hydrophilic behavior, high cell viability, surface roughness, and porosity due to the addition of nanoparticles to the CA membrane, all played a significant role in enhancing the biocompatibility and biological activity of the CA membrane. The enhancements in the CA membrane suggest that it can be utilized in drug delivery and wound healing applications.

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“…Although several vanadate-based alluaudite structures have been reported to date, − Na 2 Mn 2 Fe(VO 4 ) 3 is the only compound that has been electrochemically tested in a Na-ion cell. Its low specific capacity (35 mAh/g) has been accounted for by the redox inactivity of Mn species .…”

Section: Introductionmentioning

confidence: 99%

Unlocking New Redox Activity in Alluaudite Cathodes through Compositional Design

Giovine

Foley

et al. 2022

Chem. Mater.

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Sodium (Na)-ion conducting polyanionic structures are among the most promising cathode materials to enable more sustainable Na-based battery chemistries to replace current Li-based energy storage systems. Materials adopting the alluaudite structure have been found to reversibly intercalate Na, with phosphate and sulfate derivatives exhibiting moderate to high capacities when used as Na-ion cathodes. However, the development of alluaudite cathodes has been hampered by the fact that largely only Fe 2+/3+ redox has been observed in this structure. Herein, we show that the Mn 2+/3+ redox couple can be activated through compositional tuning of alluaudite compounds. Specifically, vanadate compounds were explored to increase the electrical conductivity as compared to the phosphates and sulfates. Al substitution was also employed to buffer the Jahn-Teller distortions of Mn(III)O6 octahedra, further facilitating electron transfer and redox processes. We report the synthesis of a series of new Na2Mn3-xAlx(VO4)3 alluaudite cathodes and employ synchrotron X-ray diffraction, solid-state nuclear magnetic resonance, scanning electron microscopy, density functional theory, X-ray absorption spectroscopy, and magnetometry to characterize the structure, morphology, electronic and magnetic properties of the as-synthesized materials. Electrochemical Na de(intercalation) in Na2Mn3-xAlx(VO4)3 (x = 0, 0.05, 0.2) was probed through galvanostatic cycling, galvanostatic intermittent titration technique, and ex situ synchrotron X-ray diffraction. While these materials are all redox active, Al substitution results in a more than two-fold increase in discharge capacity. The successful activation of a higher voltage Mn 2+/3+ redox couple opens up a new compositional space for alluaudite-type Na-ion cathodes.

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Synthesis, Characterization, and Magnetic Properties of A2Co2Fe(VO4)3 (A = Ag or Na) Alluaudite-Type Vanadates

Cited by 5 publications

References 44 publications

Alluaudite NaCoFe₂(PO₄)₃ as a 2.9 V Cathode for Sodium-Ion Batteries Exhibiting Bifunctional Electrocatalytic Activity

Alluaudite NaCoFe₂(PO₄)₃ as a 2.9 V Cathode for Sodium-Ion Batteries Exhibiting Bifunctional Electrocatalytic Activity

Magnesium Ortho-Vanadate/Magnesium Oxide/Graphene Oxide Embedded through Cellulose Acetate-Based Films for Wound Healing Applications

Unlocking New Redox Activity in Alluaudite Cathodes through Compositional Design

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Synthesis, Characterization, and Magnetic Properties of A2Co2Fe(VO4)3 (A = Ag or Na) Alluaudite-Type Vanadates

Cited by 5 publications

References 44 publications

Alluaudite NaCoFe2(PO4)3 as a 2.9 V Cathode for Sodium-Ion Batteries Exhibiting Bifunctional Electrocatalytic Activity

Alluaudite NaCoFe2(PO4)3 as a 2.9 V Cathode for Sodium-Ion Batteries Exhibiting Bifunctional Electrocatalytic Activity

Magnesium Ortho-Vanadate/Magnesium Oxide/Graphene Oxide Embedded through Cellulose Acetate-Based Films for Wound Healing Applications

Unlocking New Redox Activity in Alluaudite Cathodes through Compositional Design

Contact Info

Product

Resources

About

Alluaudite NaCoFe₂(PO₄)₃ as a 2.9 V Cathode for Sodium-Ion Batteries Exhibiting Bifunctional Electrocatalytic Activity

Alluaudite NaCoFe₂(PO₄)₃ as a 2.9 V Cathode for Sodium-Ion Batteries Exhibiting Bifunctional Electrocatalytic Activity