Highly Stable CuS Nanotrough‐Networks Constructed on Arbitrate Substrate for Flexible Supercapacitor.

Herein, supercapacitors (SC) are fabricated on arbitrary flexible substrates by constructing copper sulfide nanotrough‐network and electrodeposition of polyaniline (PANI@CuS NN) as electrode. Attributed to its unique hollow structure, the CuS NN current collector demonstrates high conductivity (10.4 Ω □−1) and mechanical flexibility (within 2.3% relative resistance change after more than 1,000 bending times at the radius of 4 mm). The obtained PANI@CuS NN electrode demonstrates more than 218.28 F g−1 specific capacity at the current density of 1 A g−1, remaining 85.08% of the original capacity after 1,000 cycles (5 A g−1). This can be attributed to that CuS NN provides abundant attachment sites for PANI by the large specific surface area. Additionally, a flexible solid‐state supercapacitor is constructed by coating silk fibroin hydrogel as the electrolyte between the PANI@CuS NN and another CuS NN electrode loaded with multiwalled carbon nanotubes (MWCNTs@CuS NN). The capacity is 107.8 F g−1 at the current density of 0.25 A g−1 with excellent cycling stability. [ABSTRACT FROM AUTHOR]