| Autor: |
Nikam, Sushama M., Sutar, Suhas H., Jituri, Shubham D., Inamdar, Akbar I., Mujawar, Sarfraj H. |
| Zdroj: |
New Journal of Chemistry; 12/7/2024, Vol. 48 Issue 45, p19113-19124, 12p |
| Abstrakt: |
Developing highly stable, low-cost, and efficient electrode materials for supercapacitor and oxygen evolution reactions is a challenging issue in energy storage and generation technology to meet the demand for sustainable and clean energy. Herein, cobalt phosphates in comparison with cobalt oxides were synthesized using a successive ionic layer adsorption and reaction (SILAR) method on a nickel foam substrate with different crystallization temperatures, and their supercapacitor and oxygen evolution reaction performances were studied. The nanorod bundles of cobalt phosphate electrodes prepared at 150 °C delivered an excellent specific charge storage capacity of 1512 F g−1 (681 C g−1) at a current density of 5 mA cm−2, which is higher than that of cobalt oxide (1103.9 F g−1 (496 C g−1)). They are highly stable for more than 2000 charge–discharge cycles with a coulombic efficiency of 93%. Furthermore, the same electrodes exhibited enhanced electrocatalytic behaviour for the oxygen evolution reaction (OER) with an overpotential of 359 mV at a current density of 30 mA cm−2, lowest Tafel slope of 60 mV dec−1 and stability of 20 hours. Enhanced reaction kinetics are attributed to the high electrochemical surface area with a Cdl of 594 μF and improved electronic conductivity. The above results indicated that cobalt phosphate is one of the most efficient electrode materials for the OER and supercapacitors. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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