Nano-aggregates of cobalt nickel oxysulfide as a high-performance electrode material for supercapacitors

Abstract

Nano-aggregates of cobalt nickel oxysulfide (CoNi)O_xS_y have been synthesized by hydrothermal processing and exhibited specific and areal capacitance as high as 592 F g⁻¹ and 1628 mF cm⁻², respectively, at a current density of 0.5 A g⁻¹/1.375 mA cm⁻². They also show high capacitance retention upon extended cycling at high rates.