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Ultrathin MoS flakes embedded in nanoporous graphene films for a multi-functional electrode
Molybdenum disulfide (MoS 2 ) is considered a promising material in energy storage systems, and is thus drawing considerable attention. However, the relatively low conductivity of bulk MoS 2 has been a threat for practical applications. This study developed a simple and scalable fabrication method o...
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| Published in: | Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2021-01, Vol.9 (2), p.928-936 |
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| Main Authors: | , , , , , |
| Format: | Article |
| Language: | |
| Online Access: | Get full text |
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| Summary: | Molybdenum disulfide (MoS
2
) is considered a promising material in energy storage systems, and is thus drawing considerable attention. However, the relatively low conductivity of bulk MoS
2
has been a threat for practical applications. This study developed a simple and scalable fabrication method of few-layer MoS
2
sheets embedded in a nanoporous graphene film (NGF) as a high capacitance active material. Transfer of MoS
2
/NGF onto a flexible substrate followed by plotter cutting produced a highly efficient micro-supercapacitor with superior flexibility, mechanical stability, and great potential for applications in wearable electronics. Notably, MoS
2
/NGF-based mSC revealed a high volumetric capacitance of 55 F cm
−3
and 82.2% of capacitance retention after 20 000 cycles, which are superior to the reported data for solid-state micro-supercapacitors. With these performances, the flexible MoS
2
/NGF mSC exhibited an ultrahigh energy density of 7.64 mW h cm
−3
and power density of 9.96 W cm
−3
in a H
3
PO
4
gel polymer electrolyte. The high volumetric capacitance and energy/power densities of MoS
2
/NGF as micro-supercapacitor electrodes are due to direct growth of ultra-thin MoS
2
onto the interconnected 3D nanoporous graphene film with extended active sites and good conductivity. The MoS
2
/NGF mSC integrated on the skin efficiently powered a light emitting diode and strain sensors. This work suggests a meaningful way to realize film type MoS
2
active materials in flexible micro-supercapacitors for wearable applications.
The ultrathin few-layer MoS
2
sheets directly grown on a nanoporous graphene film (MoS
2
/NGF), which successfully addressed the shortcomings of bulk MoS
2
for multi-functional electrodes. |
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| ISSN: | 2050-7488 2050-7496 |
| DOI: | 10.1039/d0ta10397g |