| 초록 |
DNA-based self-assembly has garnered attention as a promising ‘bottom-up’ fabrication technique. Here, intrigued by amphiphilic nature of DNA, we demonstrate a new class of DNA-directed amphiphilic self-assembly as a chemifunctional structuring strategy and explore its application to Li-S battery cathodes. During the assembly, hydrophobic nucleobases interact with single-walled carbon nanotubes (SWCNTs). The DNA-wrapped SWCNTs are inter-connected via chemical bridges of divalent metal ions that interact with hydrophilic phosphates. Finally, through hydrogel formation followed by freeze-drying, conductive DNA/SWCNT foams with hierarchical porous structure are obtained. Sulfur powders are densely embedded inside the foam to fabricate a sulfur cathode. The structural uniqueness of the 3D bicontinuous scaffold, in combination with DNA-driven capturing of polysulfides, allows the resultant sulfur cathode to provide exceptional cell performance. |
