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Nanomaterials (Basel). 2019 May 16;9(5). pii: E752. doi: 10.3390/nano9050752.

Sulfur-Doped Reduced Graphene Oxide for Enhanced Sodium Ion Pseudocapacitance.

Wang Y1,2, Hu M3, Ai D4, Zhang H5, Huang ZH6,7, Lv R8,9, Kang F10,11.

Author information

1
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. wangyiti16@mails.tsinghua.edu.cn.
2
Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China. wangyiti16@mails.tsinghua.edu.cn.
3
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. frankhu1993@163.com.
4
Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China. ai_desh@tsinghua.edu.cn.
5
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. hw-zhang14@mails.tsinghua.edu.cn.
6
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. zhhuang@tsinghua.edu.cn.
7
Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. zhhuang@tsinghua.edu.cn.
8
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. lvruitao@tsinghua.edu.cn.
9
Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. lvruitao@tsinghua.edu.cn.
10
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. fykang@sz.tsinghua.edu.cn.
11
Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. fykang@sz.tsinghua.edu.cn.

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.

KEYWORDS:

cathode materials; sodium-ion pseudocapacitor; sulfur-doped reduced graphene oxide

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