Electrochemical properties of layer-structured Hx(Ni1/3Co1/3Mn1/3)O2 for electrochemical capacitors in alkaline aqueous solutions
| Autor: | Masato Yano, Masaru Miyayama, Shinya Suzuki, Masataka Ohgaki |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Materials science
Aqueous solution 020209 energy Analytical chemistry Protonation 02 engineering and technology 010402 general chemistry Electrochemistry 01 natural sciences Capacitance Energy storage 0104 chemical sciences law.invention Energy storage devices Capacitor law Electrode 0202 electrical engineering electronic engineering information engineering Ceramics and Composites (Ni Co Mn) oxides Alkaline aqueous solutions Electrochemical capacitors Current density |
| Zdroj: | Journal of Asian Ceramic Societies. 1:71-76 |
| ISSN: | 2187-0764 |
| DOI: | 10.1016/j.jascer.2013.03.006 |
| Popis: | The electrochemical properties of layer-structured H x (Ni 1/3 Co 1/3 Mn 1/3 )O 2 were examined for the first time to evaluate its use as an electrode for an electrochemical capacitor in alkaline aqueous solutions. The protonated H x (Ni 1/3 Co 1/3 Mn 1/3 )O 2 (HNCM) was prepared by reacting Li(Ni 1/3 Co 1/3 Mn 1/3 )O 2 (LNCM) with an HCl aqueous solution. The HNCM exhibited a large capacitance of 720 F g −1 (290 mAh g −1 , −1 to 0.45 V vs. Hg/HgO) at a current density of 50 mA g −1 in 8 M KOH aqueous solution, which is the highest level for the bulk electrodes in aqueous solutions. High power density, that is a capacitance of 560 F g −1 at a large current density of 1500 mA g −1 , was also confirmed. The HNCM exhibited good cycle stability, especially in 1 M KOH aqueous solution. The HNCM was found to be a promising electrode material for electrochemical capacitors because of its large capacitance, high cycle stability, and high rate capability. |
| Databáze: | OpenAIRE |
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