Reduced Molybdenum-Niobium Oxides:

Chen, S.C.; Greenblatt, Martha

doi:10.1006/jssc.1994.1054

Cited by 6 publications

(3 citation statements)

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“…Although the final poorly crystalline Mo-oxide phases could not be directly identified, such species are not uncommon and have been observed in similar catalyst materials [48,[60][61][62][63][64][65]. In addition, the breakdown of the catalyst should result in iron sub-oxides (during reduction) and iron oxides (oxidation) [13,30] These are also not directly observed, however their presence can be inferred by the increase in CO 2 production during reduction as these phases are well known to catalyze methanol total oxidation [66,67].…”

Section: Phase Formationmentioning

confidence: 99%

A Combined Multi-Technique In Situ Approach Used to Probe the Stability of Iron Molybdate Catalysts During Redox Cycling

et al. 2009

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A setup combining a number of techniques (WAXS, XANES and UV-Vis) has been used to probe the stability of an iron molybdate catalyst during redox cycling. The catalyst was first reduced under anaerobic methanol/ helium conditions, producing formaldehyde and then regenerated using air. Although in this test-case the catalyst and conditions differ from that of a commercial catalyst bed we demonstrate how such a setup can reveal new information on catalyst materials.

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Section: Phase Formationmentioning

confidence: 99%

A Combined Multi-Technique In Situ Approach Used to Probe the Stability of Iron Molybdate Catalysts During Redox Cycling

et al. 2009

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“…[45,46] Further heat-treatment to 800 °C was trialled to establish whether the Tphase could be produced at higher temperatures, and yet here monoclinic Nb 2 O 5 • (HÀ ) was formed alongside monoclinic MoO 2 and Mo 13 O 33 (Figure S3). [47][48][49] Therefore, as the 600 °C material only consists of Nb 2 O 5 and MoO 2 , and appears to have improved crystallinity versus the other temperature it was taken forward for further investigation.…”

Section: Resultsmentioning

confidence: 99%

“…This may be due to the presence of the MoO 2 particles inhibiting the growth of the T‐Nb 2 O 5 phase, thus this composite may be exhibiting Zener pinning, where one set of particles constrains the other restricting further grain growth [45,46] . Further heat‐treatment to 800 °C was trialled to establish whether the T‐phase could be produced at higher temperatures, and yet here monoclinic Nb 2 O 5 ⋅ (H−) was formed alongside monoclinic MoO 2 and Mo 13 O 33 (Figure S3) [47–49] . Therefore, as the 600 °C material only consists of Nb 2 O 5 and MoO 2 , and appears to have improved crystallinity versus the other temperature it was taken forward for further investigation.…”

Section: Resultsmentioning

confidence: 99%

A Composite of Nb₂O₅ and MoO₂ as a High‐Capacity High‐Rate Anode Material for Lithium‐Ion Batteries

Wheeler-Jones

Loveridge

Walton

2023

Batteries & Supercaps

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A composite of Nb 2 O 5 and MoO 2 was synthesised using a hydrothermal reaction (225 °C) followed by a short heat-treatment step (600 °C) to achieve a high-capacity, high-rate anode for lithium-ion battery applications. The composite was shown via powder X-ray diffraction and electron microscopy to be an intimate mix of individual oxide particles rather than an atomically mixed oxide material, and shown by X-ray fluorescence spectroscopy (XRF) to contain a 45 : 55 ratio of Nb : Mo. This material is demonstrated to show notable rate capability in lithium (Li) half-cell cycling and rate tests. When cycled at 100 °C the material achieved over 100 mAh g À 1 even after 400 cycles and shows a stable reversible capacity of 514 mAh g À 1 (at 1 C), realising its theoretical capacity. The composite shows electrochemical results comparable to Nb 2 O 5 : C composites yet achieves far higher capacities at low-rate due to the MoO 2 content.

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Structural Distortion in the Wadsley‐Roth Niobium Molybdenum Oxide Phase Triggering Extraordinarily Stable Battery Performance

Wu,

Liang,

Kong Pang

et al. 2024

Angewandte Chemie

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Wadsley‐Roth niobium oxide phases have attracted extensive research interest recently as promising battery anodes. We have synthesized the niobium‐molybdenum oxide shear phase (Nb, Mo)13O33 with superior electrochemical Li‐ion storage performance, including an ultralong cycling lifespan of at least 15000 cycles. During electrochemical cycling, a reversible single‐phase solid‐solution reaction with lithiated intermediate solid solutions is demonstrated using in situ X‐ray diffraction, with the valence and short‐range structural changes of the electrode probed by in situ Nb and Mo K‐edge X‐ray absorption spectroscopy. This work reveals that the superior stability of niobium molybdenum oxides is underpinned by changes in octahedral distortion during electrochemical reactions, and we report an in‐depth understanding of how this stabilizes the oxide structure during cycling with implications for future long‐life battery material design.

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Reduced Molybdenum-Niobium Oxides:

Cited by 6 publications

References 0 publications

A Combined Multi-Technique In Situ Approach Used to Probe the Stability of Iron Molybdate Catalysts During Redox Cycling

A Combined Multi-Technique In Situ Approach Used to Probe the Stability of Iron Molybdate Catalysts During Redox Cycling

A Composite of Nb₂O₅ and MoO₂ as a High‐Capacity High‐Rate Anode Material for Lithium‐Ion Batteries

Structural Distortion in the Wadsley‐Roth Niobium Molybdenum Oxide Phase Triggering Extraordinarily Stable Battery Performance

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Reduced Molybdenum-Niobium Oxides:

Cited by 6 publications

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A Combined Multi-Technique In Situ Approach Used to Probe the Stability of Iron Molybdate Catalysts During Redox Cycling

A Combined Multi-Technique In Situ Approach Used to Probe the Stability of Iron Molybdate Catalysts During Redox Cycling

A Composite of Nb2O5 and MoO2 as a High‐Capacity High‐Rate Anode Material for Lithium‐Ion Batteries

Structural Distortion in the Wadsley‐Roth Niobium Molybdenum Oxide Phase Triggering Extraordinarily Stable Battery Performance

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A Composite of Nb₂O₅ and MoO₂ as a High‐Capacity High‐Rate Anode Material for Lithium‐Ion Batteries