Durable porous carbon/ZnMn2O4 composite electrode material for supercapacitor
| Autor: | Siti Rohana Majid, Cheng Kim Sim, Noor Zalina Mahmood |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Supercapacitor
Materials science Mechanical Engineering Composite number Metals and Alloys chemistry.chemical_element 02 engineering and technology Manganese Zinc 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Capacitance 0104 chemical sciences chemistry Chemical engineering Mechanics of Materials Specific surface area Materials Chemistry 0210 nano-technology Carbon |
| Zdroj: | Journal of Alloys and Compounds. 803:424-433 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2019.06.220 |
| Popis: | A series of porous carbon/zinc dimanganese (ZnMn2O4) composites was successfully synthesized through low temperature combustion of zinc chloride (ZnCl2) activated pineapple peel (PP) and MnCO3 at 500 °C. The incorporation of manganese carbonate (MnCO3) played a vital role in modifying the pore shape and size of the sample which enhanced the rate capability and stability through the synergistic effect of carbon and ZnMn2O4. Highest specific surface area of 976.12 m2g-1 for porous carbon/ZnMn2O4 composite was obtained. The composite samples were further examined for its electrochemical performance and observed that PPZn-Mn1 achieved the specific capacitance of 104.89 Fg-1 while 119.03 Fg-1 in PPZn at the current density of 300 mA g−1. PPZn-Mn1 exhibited better rate capability and cycleability with capacitance retention at 97.06% after 5000 cycles as compared to PPZn composite which dropped to 79.52%. A symmetrical cell imposed similar characteristic which 83.89% of the capacitance was retained after 5000 cycles at 300 mA g−1. Thus, the incorporation of ZnMn2O4 in this composite has highlighted its role as the supporting element to enhance the performance in cycleability and durability test. |
| Databáze: | OpenAIRE |
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