Zinc-ion hybrid supercapacitors are a promising energy storage device as they simultaneously combine the high capacity of batteries and the high power of supercapacitors. However, the practical application of Zinc-ion hybrid supercapacitors is hindered by insufficient energy density and poor rate performance. In this study, a symmetrical zinc-ion hybrid supercapacitor device was constructed with hollow mesoporous-carbon nanospheres as electrode materials, and aqueous ZnSO 4 adopted as an electrolyte. Benefiting from the mesoporous structure and high specific area (800 m 2 /g) of the hollow carbon nanospheres, fast capacitor-type ion adsorption/de-adsorption on both the cathode and the anode can be achieved, as well as additional battery-type Zn/Zn 2+ electroplating/stripping on the anode. This device thus demonstrates outstanding electrochemical performance, with high capacity (212.1 F/g at 0.2 A/g), a high energy density (75.4 Wh/kg at 0.16 kW/kg), a good rate performance (34.2 Wh/kg energy density maintained at a high power density of 16.0 kW/kg) and excellent cycling stability with 99.4% capacitance retention after 2,500 cycles at 2 A/g. The engineering of this new configuration provides an extremely safe, high-rate, and durable energy-storage device.
Lead halide perovskite materials have shown great application potential in the field of optoelectronics, but solution‐phase processing of all‐inorganic wide‐bandgap perovskite materials, especially CsPbCl3, faces great challenges due to the low solubility of the raw materials. Here, a solution‐processing of CsPbClxBr3−x perovskite micro/nanostructures (PMNSs) via a two‐step ion‐exchange method is reported. The halide composition and the surface morphology of the CsPbClxBr3−x PMNS are regulated by tailoring the reaction time of halide exchange, and the photodetectors (PDs) based on the CsPbBr2.25Cl0.75 PMNS exhibit best device performance. The CsPbBr2.25Cl0.75 PMNS PDs show excellent self‐powered performance with an open‐circuit voltage of 1.1 V, an on‐off ratio of up to 106, a responsivity of 0.31 A W−1, a detectivity of 2.87 × 1012 Jones, and a linear dynamic range of 130 dB. These excellent performances are attributed to the unique device structure in which large‐sized micro‐nanocrystals in the bottom layer guarantee the generation of carriers, and the nanowires on top penetrate the carbon and benefit from excellent contact between the perovskite and the electrode, thus resulting in a good device performance.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.