Electrochemical pseudocapacitance performance of high entropy carbide (FeCoCrMnNi)C film by magnetron sputtering technology.

Stimulated by the pursuit of small and portable electronic devices, film supercapacitors have gradually developed. Due to the advantages of composition design and controllable performance, high entropy materials have shown excellent capacitive performance in electrochemical energy storage. Therefore, in this work, five transition metal elements Fe, Co, Cr, Mn and Ni were selected with different potential windows, and the (FeCoCrMnNi)C thin films with wide potential windows were successfully deposited on titanium and graphite substrates by using magnetron sputtering technology. The body centered cubic structured (FeCoCrMnNi)C films all have crystal orientation, showing irregular particle morphology, and the optimal orientation makes them eventually grow into morphologies similar to those of the substrates. The layered structure of the (FeCoCrMnNi)C film deposited on graphite substrate for 10 min is the most conducive to the storage of pseudocapacitance. We also found that (FeCoCrMnNi)C powder has better electrochemical properties than (FeCoCrMnNi)C film in the two low-dimensional states of the (FeCoCrMnNi)C, which is of great significance for exploring the development direction of supercapacitor electrode materials in the future. [ABSTRACT FROM AUTHOR]