Oxygen-enriched vacancies Co3O4/NiCo2O4 heterojunction hollow nanocages with enhanced electrochemical properties for supercapacitors

Research into environmentally friendly energy storage devices is a vital strategy to address the energy crisis and environmental pollution challenges. In this paper, oxygen-rich vacancy Co 3 O 4 /NiCo 2 O 4 heterojunction hollow nanocage electrodes were synthesized by a two-step hydrothermal and calcination method. Taking advantage of its unique structure, oxygen vacancies, and the synergistic effect of multi-element transition metal oxides, the electrode has good conductivity, high specific surface area, and abundant active sites. As a result, the Co 3 O 4 /NiCo 2 O 4 HHNCs electrode exhibits an ultra-high specific capacitance of 1788F g −1 at 1Ag -1 , and the assembled hybrid supercapacitor has an energy density of up to 43.9 Wh kg −1 , which is promising for applications in energy storage materials.