Zn‐Ion Hybrid Micro‐Supercapacitors with Ultrahigh Areal Energy Density and Long‐Term Durability. Issue 3 (27th November 2018) - Zhang, Panpan
Abstract: On‐chip micro‐supercapacitors (MSCs), as promising power candidates for microdevices, typically exhibit high power density, large charge/discharge rates, and long cycling lifetimes. However, as for most reported MSCs, the unsatisfactory areal energy density (<10 µWh cm −2 ) still hinders their practical applications. Herein, a new‐type Zn‐ion hybrid MSC with ultrahigh areal energy density and long‐term durability is demonstrated. Benefiting from fast ion adsorption/desorption on the capacitor‐type activated‐carbon cathode and reversible Zn stripping/plating on the battery‐type electrodeposited Zn‐nanosheet anode, the fabricated Zn‐ion hybrid MSCs exhibit remarkable areal capacitance of 1297 mF cm −2 at 0.16 mA cm −2 (259.4 F g −1 at a current density of 0.05 A g −1 ), landmark areal energy density (115.4 µWh cm −2 at 0.16 mW cm −2 ), and a superb cycling stability without noticeable decay after 10 000 cycles. This work will inspire the fabrication and development of new high‐performance microenergy devices based on novel device design. Abstract : Zn‐ion hybrid micro‐supercapacitors with ultrahigh areal energy density (115.4 μWh cm −2 at 0.16 mW cm −2 ) and long‐term durability are successfully fabricated by employing a capacitor‐type activated‐carbon cathode and a battery‐type electrodeposited Zn‐nanosheet anode in a ZnSO4 ‐based aqueous electrolyte. The fabricated high‐performance hybrid microsupercapacitors offer great opportunities for new‐generation miniaturized energy‐storage devices.