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Hedhili, Mohamed Nejib
in Cooperation with on an Cooperation-Score of 37%
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Publications (5/5 displayed)
- 2023Anisotropic Superconducting Nb<sub>2</sub>CT<i><sub>x</sub></i> MXene Processed by Atomic Exchange at The Wafer Scalecitations
- 2015Mechanistic Insight into the Stability of HfO<inf>2</inf>-Coated MoS<inf>2</inf> Nanosheet Anodes for Sodium Ion Batteriescitations
- 2014Thermoelectric properties of strontium titanate superlattices incorporating niobium oxide nanolayerscitations
- 2014Influence of stacking morphology and edge nitrogen doping on the dielectric performance of graphene-polymer nanocompositescitations
- 2010Correlation of Mn charge state with the electrical resistivity of Mn doped indium tin oxide thin filmscitations
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article
Mechanistic Insight into the Stability of HfO<inf>2</inf>-Coated MoS<inf>2</inf> Nanosheet Anodes for Sodium Ion Batteries
Abstract
It is demonstrated for the first time that surface passivation of 2D nanosheets of MoS<inf>2</inf> by an ultrathin and uniform layer of HfO<inf>2</inf> can significantly improve the cyclic performance of sodium ion batteries. After 50 charge/discharge cycles, bare MoS<inf>2</inf> and HfO<inf>2</inf> coated MoS<inf>2</inf> 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 HfO<inf>2</inf> coated MoS<inf>2</inf> anodes retain 91% of the initial capacity; in contrast, bare MoS<inf>2</inf> anodes retain only 63%. Also, HfO<inf>2</inf> coated MoS<inf>2</inf> anodes show one of the highest reported capacity values for MoS<inf>2</inf>. Cyclic voltammetry and X-ray photoelectron spectroscopy results suggest that HfO<inf>2</inf> does not take part in electrochemical reaction. The mechanism of capacity retention with HfO<inf>2</inf> coating is explained by ex situ transmission electron microscope imaging and electrical impedance spectroscopy. It is illustrated that HfO<inf>2</inf> acts as a passivation layer at the anode/electrolyte interface and prevents structural degradation during charge/discharge process. Moreover, the amorphous nature of HfO<inf>2</inf> allows facile diffusion of Na ions. These results clearly show the potential of HfO<inf>2</inf> coated MoS<inf>2</inf> anodes, which performance is significantly higher than previous reports where bulk MoS<inf>2</inf> or composites of MoS<inf>2</inf> with carbonaceous materials are used. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.