Reversible Mg insertion into chevrel phase Mo6S8 cathode: Preparation, electrochemistry and X-ray photoelectron spectroscopy study

[Display omitted] •Surface modification of Mo6S8 to enhance the reactivity against Mg.•Mechanism study using XPS and EIS.•Excellent Mg-ion battery performance. Electrical energy storage is absolute for complete usage of all renewable energy sources. Herein, we have studied the electrochemical perfor...

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Bibliographic Details
Published inMaterials research bulletin Vol. 101; pp. 167 - 174
Main Authors Muthuraj, Divyamahalakshmi, Mitra, Sagar
Format Journal Article
LanguageEnglish
Published United States Elsevier Ltd 01.05.2018
Subjects
BATTERY CHARGING
C. impedance spectroscopy
C. photoelectron spectroscopy
CAPACITY
CATHODES
D. energy storage
ELECTRIC BATTERIES
ELECTROCHEMISTRY
ENERGY STORAGE
MAGNESIUM IONS
MATERIALS SCIENCE
MOLYBDENUM SULFIDES
MORPHOLOGY
REACTIVITY
REDOX PROCESS
SCANNING ELECTRON MICROSCOPY
SYNTHESIS
TRANSMISSION ELECTRON MICROSCOPY
VOLTAMETRY
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY
C. impedance spectroscopy
D. energy storage
C. photoelectron spectroscopy
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Summary:[Display omitted] •Surface modification of Mo6S8 to enhance the reactivity against Mg.•Mechanism study using XPS and EIS.•Excellent Mg-ion battery performance. Electrical energy storage is absolute for complete usage of all renewable energy sources. Herein, we have studied the electrochemical performance of Chevrel phase Mo6S8 as cathode material towards rechargeable Mg battery. Solution chemistry route is adopted for the synthesis of Mo6S8. The morphology, phase purity is analyzed by Scanning Electron Microscopy, Transmission Electron Microscopy, and X-Ray Diffraction techniques. The cyclic Voltammetry and Galvanostatic charge-discharge studies confirmed the reversibility of Mg-ion insertion. Herein, Mo6S8 cubes show excellent capacity retention of 70 mAh g−1 for 200 cycles at C/5 rate. The role of CNT in improving rate performance was also demonstrated. The reasonable reversible capacity, rate performance, and cycling stability reveal the feasibility of Mo6S8 material for future rechargeable Mg battery. In order to study the kinetics of Chevrel phase compound upon cycling, EIS study was carried out. The redox process upon insertion/extraction is investigated by X-ray Photoelectron spectroscopy which shows no change in oxidation state of a transition metal.
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2018.01.031