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Nitrogen-Doped Graphene Nanosheets Composites as Cathode in Sodium-Sulfur Batteries

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Nitrogen-Doped Graphene Nanosheets Composites as Cathode in Sodium-Sulfur Batteries ( nitrogen-doped-graphene-nanosheets-composites-as-cathode-sod )

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corrosion treatment process, which is in good agreement with other reports.[13] The XRD pattern of the heat-treated sulfur generally exhibits a series of sharp and strong peaks, indicating a well- defined Fddd orthorhombic crystalline structure of alpha-S8 (JCPDS#: 00-008-0247). A series of sharp peaks can be observed on the XRD pattern of NGNSs/S-H86 nanocomposite indicating that sulfur particles in NGNSs/S-H86 nanocomposite are in the form of gamma-S8 with P2/c monoclinic crystalline structure (JCPDS#: 01-071-0396). In the XRD pattern of NGNS/S-H65, a major peak can be observed at 26° which is assigned to (002) plane of NGNS. The other peaks match the P2/c monoclinic structure of S, indicating S as gamma-S8 exists in NGNS/S-H65. The peaks of multi-layered graphene and gamma-S8 can also be observed on both XRD patterns of NGNS/S-H45 and NGNS/S-H25. The XRD investigation reveals that the phase change of S from alpha-Sulfur8 to gamma-S8 in all of the composite samples could be due to thermal effect and/or nano-confinement of melted S diffused into NGNS. 8 This article is protected by copyright. All rights reserved

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Nitrogen-Doped Graphene Nanosheets Composites as Cathode in Sodium-Sulfur Batteries

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