Self-catalyzed decomposition of discharge products on the oxygen vacancy sites of MoO3 nanosheets for low-overpotential Li-O2 batteries

Zhang, Sanpei; Wang, Gan; Jin, Jun; Zhang, Linlin; Zhang, Wen; Yang, Jianhua

doi:10.1016/j.nanoen.2017.04.038

Cited by 93 publications

(78 citation statements)

References 51 publications

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“…As the current density increases, the intensity of LiO 2 peaks on fcc cathode is much higher than that of bcc cathode because of dominant growth over nucleation with fcc cathode. XPS spectra also support this observation with the intensity ratio between C 1s (285 eV for CC bond) and Li 1s (55 eV for LiO bond) spectra (Figure S11, Supporting Information) . The thick agglomerates of discharge products covering fcc cathode make CC bond much harder to be observed on fcc cathode compared to that on bcc cathode.…”

Section: Resultsmentioning

confidence: 53%

Regulating the Catalytic Dynamics Through a Crystal Structure Modulation of Bimetallic Catalyst

Park

Liang

Lee

et al. 2020

Advanced Energy Materials

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The surface of solid catalysts is one of the most important factors where the interface with reaction products governs the reaction kinetics. Herein, the crystal phase of palladium–copper nanoparticles (PdCu NPs) is controlled to modulate their surface atomic arrangement, which will govern the growth dynamics of discharge products on their surfaces and thus the catalytic performances in non‐aqueous lithium–oxygen (Li‐O2) batteries. First‐principles calculations and experimental validations reveal that homogeneous nucleation and distribution of discharge products are observed on the surface of body‐centered cubic PdCu NPs, promoting the oxygen reduction/evolution reaction (ORR/OER) activities in Li‐O2 batteries. However, the agglomerates formed on the surface of its face‐centered cubic homologue deteriorates ORR/OER activities, which worsen the battery performances. For the first time, this work theoretically and experimentally demonstrates how the crystal phase modulation regulates the nucleation behaviors and growth dynamics of discharge products for ORR/OER.

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Section: Resultsmentioning

confidence: 53%

Regulating the Catalytic Dynamics Through a Crystal Structure Modulation of Bimetallic Catalyst

Park

Liang

Lee

et al. 2020

Advanced Energy Materials

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“…d) Li 1s XPS spectra of the discharged (red) and recharged (black) MCO/MoO 2 @Ni cathode.e )O1s XPS spectra of the discharged and recharged MCO/MoO 2 @Ni cathode. [37] The results further suggest that the porous nanosheets structure of MoO 2 provides enough space for the storage of the discharge product Li 2 O 2 ,w hich Li 2 O 2 disappearsa fter the recharge process to re-expose the catalytic active sites. ChemSusChem 2018, 11,574 -579 www.chemsuschem.org 2018 Wiley-VCH Verlag GmbH &Co. KGaA, Weinheim diffusion,a nd Li 2 O 2 deposition and storage.…”

Section: Resultsmentioning

confidence: 80%

MnCo₂O₄/MoO₂ Nanosheets Grown on Ni foam as Carbon‐ and Binder‐Free Cathode for Lithium–Oxygen Batteries

et al. 2018

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Carbon is usually used as cathode material for Li-O batteries. However, the discharge product, such as Li O and LiO , could react with carbon to form an insulating lithium carbonate layer, resulting in cathode passivation and capacity fading. To solve this problem, the development of non-carbon cathodes is highly desirable. Herein, we successfully synthesized MnCo O (MCO) nanoparticles anchored on porous MoO nanosheets that are grown on Ni foam (current collector) (MCO/MoO @Ni), acting as a carbon- and binder-free cathode for Li-O batteries, in an attempt to improve the electrical conductivity, electrocatalytic activity, and durability. This MCO/MoO @Ni electrode delivers excellent cyclability (more than 400 cycles) and rate performance (voltage gap of 0.75 V at 5000 mA g ). Notably, the battery with this electrode exhibits a high energy efficiency (higher than 85 %). The advanced electrochemical performance of MCO/MoO @Ni can be attributed to its high electrical conductivity, excellent stability, and outstanding electrocatalytic activity. This work offers a new strategy to fabricate high-performance Li-O batteries with non-carbon cathode materials.

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“…It is found that H 0.88 MoO 3 was generated after the first discharge process and H 0.12 MoO 3 insteado fM oO 3 was obtained after discharging (Figure 16 c), thus revealing that the charge/discharge process is irreversible. [74] Copyright 2017 Elsevier. Figure 15.…”

Section: Molybdenum Oxides For Novel Batteriesmentioning

confidence: 99%

Recent Progress on Molybdenum Oxides for Rechargeable Batteries

et al. 2019

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bility during the reaction, andl ow electronic conductivity (ca. 10 À5 Scm À1 ). [28,29] Reduced molybdenum oxides,i ncluding MoO 2 and MoO x (2 < x < 3), with intrinsic oxygen vacancies, comparedwith pure MoO 3 ,can greatly increase the conductivity,a nd have been studied as attractive electrode materials. [30,31] Unfortunately,a s-fabricated batteries based on MoO 2 or MoO x electrodes still suffer from poor cycling stability and low recharge efficiency.T herefore, much effort has been invested over the past few years to pursuet he high energy efficiency, high cycling stability,a nd prominentr ate capability of molybdenum oxide-based electrodes for rechargeable batteries.Herein, we presentabrief summary of recent progress in the use of molybdenum oxides, including MoO 3 and MoO 2 ,a s well their composites, as electrodes for rechargeable batteries, such as LIBs, SIBs, Li-S batteries, Li-O 2 batteries, and other novel battery systems. The charge-storage mechanisms, fabrication of the electrode structures, and electrochemical performances, combined with their relationships, are mainlyd iscussed. This Minireview focuseso nc urrently developed strategies to improvet he energy-storage performances of the electrodes, through morphology modification,d efect engineering, and synergistic effects of hybrid electrodes, and thus, to optimize the electrochemical properties of the batteries. Finally, perspectives on MoO 3 -a nd MoO 2 -based compounds for the future development of rechargeable batteries are also presented.

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Self-catalyzed decomposition of discharge products on the oxygen vacancy sites of MoO3 nanosheets for low-overpotential Li-O2 batteries

Cited by 93 publications

References 51 publications

Regulating the Catalytic Dynamics Through a Crystal Structure Modulation of Bimetallic Catalyst

Regulating the Catalytic Dynamics Through a Crystal Structure Modulation of Bimetallic Catalyst

MnCo₂O₄/MoO₂ Nanosheets Grown on Ni foam as Carbon‐ and Binder‐Free Cathode for Lithium–Oxygen Batteries

Recent Progress on Molybdenum Oxides for Rechargeable Batteries

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Self-catalyzed decomposition of discharge products on the oxygen vacancy sites of MoO3 nanosheets for low-overpotential Li-O2 batteries

Cited by 93 publications

References 51 publications

Regulating the Catalytic Dynamics Through a Crystal Structure Modulation of Bimetallic Catalyst

Regulating the Catalytic Dynamics Through a Crystal Structure Modulation of Bimetallic Catalyst

MnCo2O4/MoO2 Nanosheets Grown on Ni foam as Carbon‐ and Binder‐Free Cathode for Lithium–Oxygen Batteries

Recent Progress on Molybdenum Oxides for Rechargeable Batteries

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MnCo₂O₄/MoO₂ Nanosheets Grown on Ni foam as Carbon‐ and Binder‐Free Cathode for Lithium–Oxygen Batteries