Volume 40 Issue 3
Mar.  2023
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ZHAO Huhu, ZHOU Yujing, HU Xiaolan, et al. Controllable preparation method and performance of three-dimensional reduced graphene oxide aerogel under mild conditions[J]. Acta Materiae Compositae Sinica, 2023, 40(3): 1512-1521. doi: 10.13801/j.cnki.fhclxb.20220424.005
Citation: ZHAO Huhu, ZHOU Yujing, HU Xiaolan, et al. Controllable preparation method and performance of three-dimensional reduced graphene oxide aerogel under mild conditions[J]. Acta Materiae Compositae Sinica, 2023, 40(3): 1512-1521. doi: 10.13801/j.cnki.fhclxb.20220424.005

Controllable preparation method and performance of three-dimensional reduced graphene oxide aerogel under mild conditions

doi: 10.13801/j.cnki.fhclxb.20220424.005
Funds:  Open Fund of the State Key Laboratory of Advanced Forming Technology and Equipment (SKL2020002); Natural Science Foundation of Shandong Province (ZR2020ME068); Key Research and Development Plan of Hainan Province (ZDYF2020011)
  • Received Date: 2022-03-07
  • Accepted Date: 2022-04-19
  • Rev Recd Date: 2022-04-07
  • Available Online: 2022-04-26
  • Publish Date: 2023-03-15
  • In order to realize the large-area controllable preparation and high performance of graphene-based three-dimensional aerogels under mild environmental conditions, hydrazine hydrate is used as reducing agent in this paper. Through low-temperature pre-frozen combined with natural drying at room temperature, large-area three-dimensional reduced graphene oxide (3D-RGO) aerogels with a diameter of 30 cm can be prepared effectively and controlled. The method has mild preparation conditions and does not need any heating conditions or special freeze-drying equipment. By controlling the reduction time, pre-frozen time, pre-frozen temperature and reaction vessel during the preparation of 3D-RGO aerogel, the shape, surface wettability, volume shrinkage aerogel can be effectively adjusted to achieve controllable preparation of 3D-RGO aerogel. The 3D-RGO aerogel has no obvious volume shrinkage and structural cracks. The aerogels exhibit a stable honeycomb-like structure with a stable pore size of about 500 μm and a low density of 3.8 mg/cm3, and it can quickly undergo a compression strain of 90% and return to the initial state. The volume shrinkage rate of the aerogels is <5% in the drying process. At the same time, the graphene aerogel exhibits good and stable conductivity. When the compressive strain increases from 0% to 90%, its conductivity increases from 17.3 S/m to 115.2 S/m. This method is suitable for the cost-effective preparation of large-area graphene aerogels.

     

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