Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 42, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202201535
Keywords
2D assemblies; 2D laminar membrane structures; ion transportation pathways; reduced graphene oxide membranes; supercapacitors
Categories
Funding
- Australian Research Council [FL180100029, DP180102890]
- University of Melbourne
- Australian Research Council [FL180100029] Funding Source: Australian Research Council
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This article uncovers the stacking structure of densely packed reduced graphene oxide (rGO) membranes and shows that they can retain interconnected network nanochannels and exhibit good capacitive performances. The nanochannel network can be fine-tuned at the sub-nanometer level to enhance performance.
Densely assembled graphene-based membranes have attracted substantial interest for their widespread applications, such as compact capacitive energy storage, ion/molecular separation, gas barrier films, and flexible electronics. However, the multiscale structure of densely packed graphene membranes remains ambiguously understood. This article combines X-ray and light scattering techniques as well as dynamic electrosorption analysis to uncover the stacking structure of the densely stacked reduced graphene oxide (rGO) membranes. The membranes are produced by reducing graphene oxide (GO) membranes with hydrazine, during which the colloidal interactions between GO sheets are modulated by the electrolyte solution. In contrast to the common notion that direct reduction of densely assembled GO sheets in parallel tends to result in significant graphitization, this article unexpectedly discovers that the resultant densely packed rGO membrane can still retain the interconnected network nanochannels and show good capacitive performances. This inspires the development of a hierarchical structural model to describe the densely packed rGO membranes. This article further shows that the nanochannel network can be fine-tuned at the sub-nanometer level by tailoring the salt concentration and the reduction temperature to render exceptional volumetric capacitance and good rate performance for rGO membranes even with increased packing density.
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