| Summary: | The increasing concern on the safety risks associated
with the flammable organic electrolytes in alkali-ion batteries and the
pursuit of both high energy density and power density in one device
has spurred the investigation of aqueous multivalent metal ion hybrid
supercapacitors. Zinc ion hybrid supercapacitors (ZIHSCs) have the
advantages of low standard potential, high theoretical capacity and
good safety in aqueous electrolytes. In this review, the recent
advancements achieved in ZIHSCs have been summarized and
discussed. The progress in cathode, anode, electrolyte and the
approaches adoptable to improve the electrochemical performance
of ZIHSCs have been categorized. Mechanism investigation through
different ex-situ and in-situ methods, incorporation of multifunctionality
and integration are also demonstrated. Adoption of
more in-situ characterization methods to understand the
electrochemical mechanism of ZIHSCs is encouraged. Future
development of ZIHSCs with higher active materials utilization rate
and power output for practical applications is envisioned, assembly
of ZIHSCs with more functionality is also expected
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