Nanostructure selenium compounds as pseudocapacitive electrodes for high-performance asymmetric supercapacitor
| Autor: | Hui Peng, Guofu Ma, Kanjun Sun, Fengting Hua, Ziqiang Lei, Zhiguo Zhang, Enke Fenga |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Morphology (linguistics)
Materials science Nanostructure chemistry.chemical_element 02 engineering and technology asymmetric supercapacitor 010402 general chemistry Electrochemistry 01 natural sciences Energy transformation lcsh:Science Supercapacitor Multidisciplinary 021001 nanoscience & nanotechnology Microstructure 0104 chemical sciences Chemistry chemistry Chemical engineering Electrode Bi18SeO29/BiSe lcsh:Q 0210 nano-technology Co0.85Se Selenium Research Article |
| Zdroj: | Royal Society Open Science Royal Society Open Science, Vol 5, Iss 1 (2018) |
| ISSN: | 2054-5703 |
| Popis: | The electrochemical performance of an energy conversion and storage device like the supercapacitor mainly depends on the microstructure and morphology of the electrodes. In this paper, to improve the capacitance performance of the supercapacitor, the all-pseudocapacitive electrodes of lamella-like Bi 18 SeO 29 /BiSe as the negative electrode and flower-like Co 0.85 Se nanosheets as the positive electrode are synthesized by using a facile low-temperature one-step hydrothermal method. The microstructures and morphology of the electrode materials are carefully characterized, and the capacitance performances are also tested. The Bi 18 SeO 29 /BiSe and Co 0.85 Se have high specific capacitance (471.3 F g –1 and 255 F g –1 at 0.5 A g –1 ), high conductivity, outstanding cycling stability, as well as good rate capability. The assembled asymmetric supercapacitor completely based on the pseudocapacitive electrodes exhibits outstanding cycling stability (about 93% capacitance retention after 5000 cycles). Moreover, the devices exhibit high energy density of 24.2 Wh kg –1 at a power density of 871.2 W kg –1 in the voltage window of 0–1.6 V with 2 M KOH solution. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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