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Unique holey graphene/carbon dots frameworks by microwave-initiated chain reduction for high-performance compressible supercapacitors and reusable oil/water separation
- Source :
- Journal of Materials Chemistry A. 7:22054-22062
- Publication Year :
- 2019
- Publisher :
- Royal Society of Chemistry (RSC), 2019.
-
Abstract
- It is still a big challenge to integrate intrinsic modification and self-standing structure construction into graphene via a rapid and facile approach. Herein, we report a sampling and quick in situ chain reduction technology to prepare nitrogen-doped porous graphene frameworks. In this process, easily dispersible graphene serves as an effective receptor for microwave absorption and initiates the reduction of graphene oxide; the reduced part of GO becomes the microwave-absorbing receptor to cause a “chain reduction”, which allows the NPGFs to form in 3–5 s. The as-prepared graphene frameworks maintain the long-range layered structure of the precursor film, while the holey graphene sheets loaded with nanoparticles form a networked structure in the short range. Furthermore, the hierarchical framework with a high specific surface area shows interesting applications in supercapacitors and oil–water separation. The assembled compressible supercapacitor delivered a volumetric energy density of 12.3 mW h cm−3 at a power density of 0.42 W cm−3 and exhibits stable performance under compression. In addition, the graphene frameworks exhibited reusability with mechanical squeezing and extremely high volumetric absorption capacity of 100–243 g cm−3 for different oils and organic solvents, which is much higher than that in other reports (the performance index is ∼1 g cm−3). This study provides a new way to construct a multi-functional graphene self-standing structure, which presents potential application value in catalysis, energy storage, and environmental protection.
- Subjects :
- Supercapacitor
Materials science
Renewable Energy, Sustainability and the Environment
Graphene
Oxide
Nanoparticle
Nanotechnology
02 engineering and technology
General Chemistry
021001 nanoscience & nanotechnology
Energy storage
law.invention
chemistry.chemical_compound
chemistry
law
Specific surface area
General Materials Science
0210 nano-technology
Absorption (electromagnetic radiation)
Reusability
Subjects
Details
- ISSN :
- 20507496 and 20507488
- Volume :
- 7
- Database :
- OpenAIRE
- Journal :
- Journal of Materials Chemistry A
- Accession number :
- edsair.doi...........5b30bb74fa760c15ed1c7664ee7d37e6