Synthesis of graphene oxide anchored porous manganese sulfide nanocrystals via the nanoscale Kirkendall effect for supercapacitors

Graphene oxide (GO) anchored porous manganese sulfide nanocrystals (MnS/GO-NH 3 ) were obtained via a facile hydrothermal method based on the Kirkendall effect. The honeycomb-like manganese sulfide nanocrystals (40–80 nm) and the three-dimensional sandwich structure endow the MnS/GO-NH 3 with high s...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2015-01, Vol.3 (24), p.12913-12919
Main Authors: Tang, Yongfu, Chen, Teng, Yu, Shengxue, Qiao, Yuqing, Mu, Shichun, Hu, Jie, Gao, Faming
Format: Article
Language:English
Subjects:
Capacitors
Electrodes
Graphene
Kirkendall effect
Manganese
Nanocrystals
Sulfides
Supercapacitors
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Summary:Graphene oxide (GO) anchored porous manganese sulfide nanocrystals (MnS/GO-NH 3 ) were obtained via a facile hydrothermal method based on the Kirkendall effect. The honeycomb-like manganese sulfide nanocrystals (40–80 nm) and the three-dimensional sandwich structure endow the MnS/GO-NH 3 with high supercapacitive performance when it was used as a supercapacitor material. The MnS/GO-NH 3 electrode exhibits high specific capacitance (390.8 F g −1 at 0.25 A g −1 ), high rate capacity (78.7% retention at 10 A g −1 ) and stable cycle life (81.0% retention after 2000 cycles), which are superior to those of GO anchored MnS floccules (MnS/GO) and manganese hydroxide (Mn(OH) 2 /GO). As a novel material for supercapacitors, the charge–discharge mechanism of the MnS/GO-NH 3 composite is proposed via detailed investigation. Asymmetric supercapacitors, assembled with MnS/GO-NH 3 as the positive material and activated carbon as the negative electrode, reveal a high specific capacitance (73.63 F g −1 ), a high energy density of 14.9 W h kg −1 at 66.5 W kg −1 and even 12.8 W h kg −1 at a high power density of 4683.5 W kg −1 .
ISSN:2050-7488
2050-7496
DOI:10.1039/C5TA02480C