One-step hydrothermal synthesis of two-dimensional cobalt sulfide for high-performance supercapacitors

We report a simple strategy to prepare 2-dimensional cobalt sulfide by the one-step hydrothermal process. The cobalt sulfide sample has a microstructure of interconnected sheets. As the electrode material for supercapacitors, the layered cobalt sulfide film exhibits superior performances with high specific capacitances (1314 F g−1 at 3 A g−1) as well as excellent cycle life (less than 8.3% decrease in specific capacitance after 500 cycles at 3 A g−1), making it suitable for high-performance supercapacitor application.