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Sulfur-Doped Reduced Graphene Oxide for Enhanced Sodium Ion Pseudocapacitance

1
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
2
Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
3
Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Nanomaterials 2019, 9(5), 752; https://doi.org/10.3390/nano9050752
Received: 5 April 2019 / Revised: 9 May 2019 / Accepted: 12 May 2019 / Published: 16 May 2019
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Abstract

Sodium-ion capacitors (NICs) are considered an important candidate for large-scale energy storage in virtue of their superior energy–power properties, as well as availability of rich Na+ reserves. To fabricate high-performance NIC electrode material, a hydrothermal method was proposed to synthesize sulfur-doped reduced graphene oxide (SG), which exhibited unique layered structures and showed excellent electrochemical properties with 116 F/g capacitance at 1 A/g as the cathode of NICs from 1.6 V to 4.2 V. At the power–energy density over 5000 W/kg, the SG demonstrated over 100 Wh/kg energy density after 3500 cycles, which indicated its efficient durability and superior power–energy properties. The addition of a sulfur source in the hydrothermal process led to the higher specific surface area and more abundant micropores of SG when compared with those of reduced graphene oxide (rGO), thus SG exhibited much better electrochemical properties than those shown by rGO. Partially substituting surface oxygen-containing groups of rGO with sulfur-containing groups also facilitated the enhanced sodium-ion storage ability of SG by introducing sufficient pseudocapacitance. View Full-Text
Keywords: sulfur-doped reduced graphene oxide; sodium-ion pseudocapacitor; cathode materials sulfur-doped reduced graphene oxide; sodium-ion pseudocapacitor; cathode materials
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Wang, Y.; Hu, M.; Ai, D.; Zhang, H.; Huang, Z.-H.; Lv, R.; Kang, F. Sulfur-Doped Reduced Graphene Oxide for Enhanced Sodium Ion Pseudocapacitance. Nanomaterials 2019, 9, 752.

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