The Ni 0-valent and Ni0.85Se components of heterogeneous nanosheet electrodes effects on electrochemical properties for hybrid supercapacitor

D-shell unfilled open-shell transition metal causes a variety of oxidation states and high electron transfer rate, and is widely studied as a promising energy storage electrode material. However, poor electrical conductivity and unstable nanostructures are still the bottlenecks that restrict the further development of transition metal oxides. Therefore, in this work, a variety of valence transition metal selenide heterogeneous nanosheet electrode is prepared, which not only has a three-dimensional porous structure, but also has high conductivity and excellent electrochemical activity. The pore structure and electrical conductivity are proportional to the selenization time. The electrochemical activity of heterogeneous composite is the best after 4 h selenization, and Ni 0 valence, heterostructure and nickel selenide components are the main factors affecting the electrochemical performance. Quantitative control of Ni 0 valence content, heterogeneous structure and nickel selenide components is a key problem affecting the mechanism of electrochemical performance.