Transition metal oxides are promising electrode candidates for supercapacitor because of their low cost, high theoretical capacity, and good reversibility. However, intrinsically poor electrical conductivity and sluggish reaction kinetics of these oxides normally lead to low specific capacity and slow rate capability of the devices. Herein, a commonly used cobalt oxide is used as an example to demonstrate that lithiation process as a new strategy to enhance its electrochemical performance for supercapacitor application. Detailed characterization reveals that electrochemical lithiation of Co 3 O 4 crystal reduces the coordination of the CoO band, leading to substantially increased oxygen vacancies (octahedral Co 2+ sites). These vacancies further trigger the formation of a new electronic state in the bandgap, resulting in remarkably improved electrical conductivity and accelerated faradic reactions. The lithiated Co 3 O 4 exhibits a noticeably enhanced specific capacity of 260 mAh g −1 at 1 A g −1 , approximately fourfold enhancement compared to that of pristine Co 3 O 4 (66 mAh g −1). The hybrid supercapacitor assembled with lithiated Co 3 O 4 //N-doped activated carbon achieves high energy densities in a broad range of power densities, e.g., 76.7 Wh kg −1 at 0.29 kW kg −1 , 46.9 Wh kg −1 at a high power density of 18.7 kW kg −1 , outperforming most of the reported hybrid supercapacitors.
Rational design of organic structure-directing agents (OSDAs) is always regarded as a promising strategy to produce ZSM-48 with diversified configurations. However, up till now, only OSDAs with alkyl and alkenyl...
The conventional cationic redox centers of transition-metal-based cathodes are reaching their theoretical capacity limit which cannot match the ultra-high specific capacity contributed by the three-electron transfer reaction of Al anode...
Rechargeable aluminum-ion batteries, RAIBs, as a prime candidate for next-generation batteries, have attracted much attention due to the extremely high anode capacity and good safety. However, the lack of matching...
Rechargeable aluminum ion batteries (RAIBs) arouse great attention for stationary energy storage, but still lack of suitable cathode materials. Here, a porous iron fluoride/multi wall carbon nanotube (FeF3/MWCNTs) composite as...
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