Formation of Micron-Sized Nickel Cobalt Sulfide Solid Spheres with High Tap Density for Enhancing Pseudocapacitive Properties
| Autor: | Li Su, Wang Yang, Qinghua Du, Zhipeng Ma, Mengya Feng, Liyin Hou, Lijun Gao, Guangjie Shao, Xucai Yin |
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| Rok vydání: | 2017 |
| Předmět: |
Supercapacitor
chemistry.chemical_classification Materials science Sulfide Renewable Energy Sustainability and the Environment General Chemical Engineering chemistry.chemical_element Nanotechnology 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Capacitance Cobalt sulfide 0104 chemical sciences chemistry.chemical_compound Nickel chemistry Chemical engineering Electrical resistivity and conductivity Environmental Chemistry 0210 nano-technology Current density Power density |
| Zdroj: | ACS Sustainable Chemistry & Engineering. 5:9945-9954 |
| ISSN: | 2168-0485 |
| DOI: | 10.1021/acssuschemeng.7b01906 |
| Popis: | The synthesis of nickel cobalt sulfide is well-established because of its good electrical conductivity and great structural flexibility with low cost. It is extremely challenging to fabricate a unique structure with high tap density to improve its volumetric energy density and practical application. Here, we report a simple one-step hydrothermal method to synthesize micron-sized Ni–Co mixed sulfide solid spheres (1–2 μm in diameter). Because of the high tap density of more than 1.0 g cm–3 and the unique structure, the Ni–Co mixed sulfides demonstrate exceptional energy-storage performance. When acting as an electrode material for supercapacitors, these Ni–Co solid spheres can deliver a specific capacitance of 1492 F g–1 at a current density of 1.0 A g–1, and a retention of 76% at 10 A g–1 after 10 000 cycles. An asymmetric supercapacitor based on these solid spheres exhibits a high energy density of 48.4 W h kg–1 at a power density of 371.2 W kg–1 with excellent long-term cycling performance (91% retentio... |
| Databáze: | OpenAIRE |
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