Recent advances in transition metal sulfide-based electrode materials for supercapacitors

Supercapacitors, as highly promising charge storage systems, have attracted much attention due to their fast charging and discharging rates, high power density, and longer service life. However, compared to rechargeable batteries, the low energy density of supercapacitors limits their practical applications. Rational design of advanced electrode materials shows great potential to address the above issue. In recent years, transition metal sulfides (TMSs) have become a promising material for hybrid supercapacitors due to their low cost, excellent redox reversibility, and electronic conductivity. This comprehensive review summarizes the recent progress in synthetic methods of transition metal sulfides. Additionally, the improvement strategies for the electrochemical performance of TMSs are highlighted. Finally, the challenges and perspectives of TMSs for supercapacitors in the future are discussed.