Flexible supercapacitors with high areal capacitance based on hierarchical carbon tubular nanostructures

Hierarchical carbon tubular nanostructures with blood-vessel-like multichannel hierarchy were prepared through a simple method based on direct conversion of carbon dioxide. These hCTN-based flexible supercapacitors possess the highest areal capacitance of ∼80 mF cm−2, as well as good rate-capability and excellent cycling stability (95% retention after 2500 cycles). The reported the capability of designing hierarchical carbon tubular nanostructures on the versatile substrates is that overcoming obstacles to applications in interconnect and contact technologies, supercapacitors, and will also open up new possibilities for practical applications.305