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RSC Advances · 2017 ·Vol. 7 ·期 26 ·16210-16216 · IF 3.108

Robust ambient pressure dried polyimide aerogels and their graphene oxide directed growth of 1D–2D nanohybrid aerogels using water as the only solvent

Guangjie Yang,Tianli Ning,Wei Zhao,Wenxiu Deng,Xikui Liu

Here, using water as the only solvent, we report the first green approach to the morphological controlled synthesis of robust ambient dried polyimide aerogels composed of interconnected hollow spheres. The addition of graphene oxide can direct the growth of polyimide into nanofibers and form 1D–2D nanohybrid aerogels. The mechanism behind is a soft/hard template directed dissolution-polymerization-reprecipitation process. After carbonization, a monolith carbon aerogel with monodisperse micropores could be formed. Such a green approach for the morphology controlled synthesis of robust polyimide aerogels and their carbon aerogels should be of great value for their environmental and energy related applications.

研究领域: 材料科学 · 环境科学 · 能源科学

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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS · 2019 ·Vol. 30 ·期 9 ·8585-8594 · IF 2.195

Nanocellulose-derived carbon nanosphere fibers-based nanohybrid aerogel for high-performance all-solid-state flexible supercapacitors

Lv Yanyan,Zhou Yi,Shao Ziqiang,Liu Yanhua,Wei Jie,Ye Zhengqing

In order to meet the urgent needs of portable and flexible devices in today’s society, it is strongly demanded to develop a next-generation, low-cost, flexible, lightweight, and sustainable supercapacitor system with high electrochemical performance and good operational safety. Here, a new type of highly flexible and lightweight all-solid-state supercapacitor is developed by using the freestanding and highly porous nanohybrid aerogel films consisting of carbon nanosphere fibers (CNPFs)/molybdenum disulfide (MoS 2 )/reduced graphene oxide (RGO) as electrodes and using H 2 SO 4 /polyvinyl alcohol (PVA) gel as electrolyte. The CNPFs/MoS 2 /RGO nanohybrid aerogels are prepared by one-step pyrolysis of the nanocellulose fibers (NCFs)/MoS 2 /graphene oxide (GO) aerogels obtained via freeze-drying process. During the pyrolysis process, the NCFs is carbonized to CNPFs and the GO is thermally reduced to RGO. The as-prepared all-solid-state flexible supercapacitors exhibit high specific capacitance of 1144.3 F g −1 at 2 mV s −1 with good cycling stability of more than 98% of the capacitance is retained after 10,000 charge–discharge cycles at a current density of 5 mA cm −2 . Moreover, they can deliver high energy density and power density which are up to 57.5 µW h cm −2 (28.8 W h kg −1 ) and 29.1 mW cm −2 (14.5 kW kg −1 ), respectively. Therefore, we provide the highly porous CNPFs/MoS 2 /RGO nanohybrid aerogels with characteristics of superior electrochemical performance, remarkable bending stability, environmental friendliness and low cost will be a potential promising electrode material for highly flexible all-solid-state supercapacitors.

CAS / MDL: 2564-83-2

研究领域: 材料科学 · 能源存储 · 环境科学

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Robust ambient pressure dried polyimide aerogels and their graphene oxide directed growth of 1D–2D nanohybrid aerogels using water as the only solvent

Nanocellulose-derived carbon nanosphere fibers-based nanohybrid aerogel for high-performance all-solid-state flexible supercapacitors