Ion-exchange derived transition metal layered double hydroxide/metal sulfide nanostructures for supercapacitor application

다국어 초록 (Multilingual Abstract)

The highly conductive, open and porous 2-dimensional nanostructures based electrodes are desired for performance improvement of supercapacitor. In this study, cobalt manganese layered double hydroxide/metal sulfide (MnSx/CoySz) electrodes with open and porous nanostructure are directly grown on conductive substrate without any alkali source. The solution based ion exchange and etching mechanisms transform compact and solid microcubes of manganese sulfide into open and porous surface nanostructured electrodes such as nanoplates of MnCo LDH/MnSx and nanosheets of CoMn LDH/CoySz. Both CoMn LDH/MnSx and CoMn LDH/CoySz electrodes demonstrate an excellent electrochemical charge storage properties in 1 M KOH. However, CoMn LDH/CoySz electrode exhibits highest specific capacitance of 940 Fg<SUP>-1</SUP> at 5 mVs<SUP>-1</SUP> scan rate owing to highly thin nanosheets like structure, which provide higher electrochemical active sites and low equivalent series resistance.