期刊
ACS NANO
卷 14, 期 5, 页码 6249-6257出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c02379
关键词
3D porous graphene oxide bulk; in situ casting; open ambient condition; graphene aerogel; hierarchically closed-cellular structure
类别
资金
- National Key RAMP
- D Program of China [2017YFB1104300, 2016YFA0200200]
- NSFC [51673026, 51433005]
- NSFC-MAECI [51861135202]
- Analysis AMP
- Testing Center, Beijing Institute of Technology
Graphene aerogels (GAs) with attractive properties have shown tremendous potentials in energy- and environment-related applications. Unfortunately, current assembly methods for GAs such as sol-gel and freeze-casting processes must be conducted in enclosed spaces with unconventional conditions, thus being literally inoperative for in situ and continuous productions. Herein, a direct slurry-casting method at open ambient conditions is established to arbitrarily prepare three-dimensional (3D) porous graphene oxide (GO) bulks without macroscopic dimension limits on a wide range of solid surfaces by retarding Ostwald ripening of 3D liquid GO foams when being dried in air. A subsequent fast thermal reduction (FTR) of GO foams leads to the formation of graphene aerogels (denoted as FTR-GAs) with hierarchical closed-cellular graphene structures. The FTR-GAs show outstanding high-temperature thermal insulation (70% decrease for 400 degrees C), as well as superelasticity (>1000 compression-recovery cycles at 50% strain), ultralow density (10-28 mg cm(-3)), large specific surface area (BET, 206.8 m(2) g(-1)), and high conductivity (ca. 100 S m(-1)). This work provides a viable method to achieve in situ preparations of high-performance GAs as multifunctional structural materials in aircrafts, high-speed trains, or even buildings for the targets of energy efficiency, comfort, and safety.
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