Ternary chalcogenide micro-pseudocapacitors for on-chip energy storage

Abstract

We report the successful fabrication of a micro-pseudocapacitor based on ternary nickel cobalt sulfide for the first time, with performance substantially exceeding that of previously reported micro-pseudocapacitors based on binary sulfides. The CoNi₂S₄ micro-pseudocapacitor exhibits a maximum energy density of 18.7 mW h cm⁻³ at a power density of 1163 mW cm⁻³, and opens up an avenue for exploring a new family of ternary oxide/sulfide based micro-pseudocapacitors.