Super long-life all solid-state asymmetric supercapacitor based on NiO nanosheets and α-Fe2O3 nanorods

•A novel NiO//α-Fe2O3 all solid-state asymmetric supercapacitor has been constructed.•It demonstrates high energy/power densities (12.4 W h kg−1 and 951 W kg−1).•The device exhibits a long cycle life with 85% capacity retention after 10,000 cycles.•The device with a lightweight and low-cost materials is fabricated.

Through a facile hydrothermal method at a mild temperature and a calcination process, we report the fabrication about the NiO nanosheets and α-Fe2O3 nanorods using nickel foam (NF) and carbon cloth (CC) as substrates. Analysis of data obtained from the electrochemical experiments show that NiO electrode possesses large areal capacitance (1.3 F cm−2 at 4 mA cm−2). Also, α-Fe2O3 electrode delivers areal capacitance of 500 mF cm−2 at current density of 4 mA cm−2. Therefore, a high-performance all solid-state asymmetric supercapacitor (ASC) based on 3D sheet-like hierarchical NiO and α-Fe2O3 nanorods are designed and fabricated. New ASC can be cycled reversibly in a high voltage region ranging from 0 to 1.25 V with high energy densities of 12.4 W h kg−1 (power is 951 W kg−1) based on the total mass of active materials. Furthermore, the obtained data indicate that the fabricated NiO//α-Fe2O3 based supercapacitor device has a great cycle performance with 85% capacitance retention under 10,000 cycles. This work may help to open up new areas for fabrication of lightweight and low-cost materials for energy storage systems.

Graphical abstractA novel all solid-state asymmetric supercapacitor has been constructed with NiO nanosheets and α-Fe2O3 nanorods. It can be cycled reversibly in a high voltage region and demonstrates high energy/power densities (12.4 W h kg−1 and 951 W kg−1). Furthermore, NiO//α-Fe2O3 supercapacitor device exhibits a long cycle life with 85% capacitance retention after 10,000 cycles. The electrodes with superior capacitor characteristic might provide an efficient strategy to fabricate lightweight and low-cost materials in energy storage systems.Figure optionsDownload full-size imageDownload as PowerPoint slide