Heterostructured Ov‐Mn2O3@Cu2SnS3@SnS Composite as Battery‐Type Cathode Material for Extrinsic Self‐Charging Hybrid Supercapacitors

Abstract

AbstractIn this work, self‐charging pouch‐type hybrid supercapacitor (HSCs) is fabricated by extrinsic integration of wind and solar energy power systems. Initially, the synthesized mesoporous 3D‐rhombohedral Mn2O3 shows a specific capacity of 37.61 mA h g−1 in KOH plus redox additives electrolyte. Further, the oxygen vacancy of Mn2O3 is tuned by fast‐reduction (FR) and mild‐reduction (MR) techniques. The rich oxygen vacancy of FR‐Mn2O3 (rich Ov‐Mn2O3) exhibits a specific capacity of 66.64 mA h g−1. On the other hand, the different morphologies of Cu2SnS3@SnS are synthesized by time‐dependent solvothermal technique. The 3D‐microsphere Cu2SnS3@SnS shows higher electrochemical performance than the others. In order to further improve the electrochemical performance, the heterostructure of rich Ov‐Mn2O3@Cu2SnS3@SnS composite is prepared that provides a maximum specific capacity of 126.07 mA h g−1 at 8 mA cm−2 and rate capability of 66.09% with retention of 93.89% after 10 000 cycles. This is ascribing to high electrical/ionic conductivity, larger faradaic reactions, lower interfacial resistance, and synergistic effect. Then, the fabricated pouch‐type HSC delivers a maximum specific energy density of 47.97 Wh kg−1 and power density of 5120 W kg−1. Finally, the pouch HSCs are employed for practical self‐charging applications.