Mechanistic Insight into the Stability of HfO2-Coated MoS2 Nanosheet Anodes for Sodium Ion Batteries

Handle URI:
http://hdl.handle.net/10754/565995
Title:
Mechanistic Insight into the Stability of HfO2-Coated MoS2 Nanosheet Anodes for Sodium Ion Batteries
Authors:
Ahmed, Bilal ( 0000-0002-6707-822X ) ; Anjum, Dalaver H.; Hedhili, Mohamed N. ( 0000-0002-3624-036X ) ; Alshareef, Husam N. ( 0000-0001-5029-2142 )
Abstract:
It is demonstrated for the first time that surface passivation of 2D nanosheets of MoS2 by an ultrathin and uniform layer of HfO2 can significantly improve the cyclic performance of sodium ion batteries. After 50 charge/discharge cycles, bare MoS2 and HfO2 coated MoS2 electrodes deliver the specific capacity of 435 and 636 mAh g-1, respectively, at current density of 100 mA g-1. These results imply that batteries using HfO2 coated MoS2 anodes retain 91% of the initial capacity; in contrast, bare MoS2 anodes retain only 63%. Also, HfO2 coated MoS2 anodes show one of the highest reported capacity values for MoS2. Cyclic voltammetry and X-ray photoelectron spectroscopy results suggest that HfO2 does not take part in electrochemical reaction. The mechanism of capacity retention with HfO2 coating is explained by ex situ transmission electron microscope imaging and electrical impedance spectroscopy. It is illustrated that HfO2 acts as a passivation layer at the anode/electrolyte interface and prevents structural degradation during charge/discharge process. Moreover, the amorphous nature of HfO2 allows facile diffusion of Na ions. These results clearly show the potential of HfO2 coated MoS2 anodes, which performance is significantly higher than previous reports where bulk MoS2 or composites of MoS2 with carbonaceous materials are used. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
KAUST Department:
Materials Science and Engineering Program
Publisher:
Wiley-Blackwell
Journal:
Small
Issue Date:
Jun-2015
DOI:
10.1002/smll.201500919
Type:
Article
ISSN:
16136810
Appears in Collections:
Articles; Materials Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorAhmed, Bilalen
dc.contributor.authorAnjum, Dalaver H.en
dc.contributor.authorHedhili, Mohamed N.en
dc.contributor.authorAlshareef, Husam N.en
dc.date.accessioned2015-08-12T08:58:36Zen
dc.date.available2015-08-12T08:58:36Zen
dc.date.issued2015-06en
dc.identifier.issn16136810en
dc.identifier.doi10.1002/smll.201500919en
dc.identifier.urihttp://hdl.handle.net/10754/565995en
dc.description.abstractIt is demonstrated for the first time that surface passivation of 2D nanosheets of MoS2 by an ultrathin and uniform layer of HfO2 can significantly improve the cyclic performance of sodium ion batteries. After 50 charge/discharge cycles, bare MoS2 and HfO2 coated MoS2 electrodes deliver the specific capacity of 435 and 636 mAh g-1, respectively, at current density of 100 mA g-1. These results imply that batteries using HfO2 coated MoS2 anodes retain 91% of the initial capacity; in contrast, bare MoS2 anodes retain only 63%. Also, HfO2 coated MoS2 anodes show one of the highest reported capacity values for MoS2. Cyclic voltammetry and X-ray photoelectron spectroscopy results suggest that HfO2 does not take part in electrochemical reaction. The mechanism of capacity retention with HfO2 coating is explained by ex situ transmission electron microscope imaging and electrical impedance spectroscopy. It is illustrated that HfO2 acts as a passivation layer at the anode/electrolyte interface and prevents structural degradation during charge/discharge process. Moreover, the amorphous nature of HfO2 allows facile diffusion of Na ions. These results clearly show the potential of HfO2 coated MoS2 anodes, which performance is significantly higher than previous reports where bulk MoS2 or composites of MoS2 with carbonaceous materials are used. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.en
dc.publisherWiley-Blackwellen
dc.subjectAnodesen
dc.subjectAtomic layer depositionen
dc.subjectMoS<inf>2</inf>en
dc.subjectNanosheetsen
dc.subjectSodium ion batteriesen
dc.titleMechanistic Insight into the Stability of HfO2-Coated MoS2 Nanosheet Anodes for Sodium Ion Batteriesen
dc.typeArticleen
dc.contributor.departmentMaterials Science and Engineering Programen
dc.identifier.journalSmallen
kaust.authorAnjum, Dalaver H.en
kaust.authorHedhili, Mohamed N.en
kaust.authorAlshareef, Husam N.en
kaust.authorAhmed, Bilalen
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