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surface area, and high mechanical strength.[6] In our previous work, we have reported a promising N-doped graphene nanosheets/sulfur (NGNS/S) composite as cathode in lithium- sulfur batteries.[7] N-doping can easily modify local electronic structures of graphene and enhance binding of other ions with the 2D layers.[7-8] Graphene with N-functional groups has been used as a conductive framework to facilitate immobilization of sulfur discharge products in several Li-S works. For instance, Mathiram et al. proved that N functional groups can effectively improve the affinity and binding energy between the N heteroatoms and lithium polysulfides/Li2S and significantly enhance the electrochemical performance of Li-S batteries.[9] Zhang et al. used computational approach to demonstrate that the binding energies for N-doped graphene with atomic Li and Li polysulfides are stronger compared to the case of primitive graphene, which proposed that the electrochemical enhancement could be attributed to strong ionic attractions between N heteroatoms and Li cations instead of S anions.[10] Lou et al. reported exceptional performance in Li-S batteries due to amino-functionalized reduced graphene oxide covalently stabilized S and lithium polysulfides on its surface with good conductivity and high mechanical stability.[11] However, in terms of RT Na-S battery, according to our knowledge, no research has been published to utilize N-doped graphene or its composite as electrode component. It is of our interest to study the possibility of minimizing shuttle effect of the sodium polysulfides using N functional groups and verify the feasibility of 2D N-doped graphene in RT Na-S battery application. In this contribution, NGNS/S nanocomposites with various weight loadings of S were fabricated and evaluated as cathode in RT Na-S batteries. A thermal treatment for the NGNS/S composite was conducted with the aim of better encapsulating S into the graphene layers and improving the kinetics. The electrochemical testing results show that NGNS/S composite with 25% S loading exhibits a better performance in terms of capacity retention, cycle 5 This article is protected by copyright. All rights reservedPDF Image | Nitrogen-Doped Graphene Nanosheets Composites as Cathode in Sodium-Sulfur Batteries
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