Synthesis of polycrystalline cobalt selenidenanotubes and their catalytic and capacitive behaviors

Abstract

Polycrystalline Co_0.85Se nanotubes are successfully prepared by using Co(CO₃)_0.35Cl_0.20(OH)_1.10 nanorods as precursor through a solvothermal process. The as-prepared Co_0.85Se nanotubes show efficient catalytic performance for decomposition of hydrazine hydrate at room temperature. The catalysts can be repeatedly used and their repeatability is also excellent. The Co_0.85Se nanotubes can also be applied as supercapacitor electrode materials. Galvanostatic charge–discharge measurements show that the Co_0.85Se nanotube electrode has a specific capacitance of 238 F g⁻¹ at a current density of 1 A g⁻¹ after 100 cycles of activation, and retaining 90.3% of the capacitance after the next 1900 cycles.