| abstract |
A method for oxidizing water including fabricating a working electrode using an electrocatalyst, preparing an electrochemical cell by putting the working electrode, a counter electrode, and a reference electrode in an electrolyte, and performing an oxygen evolution reaction (OER) by applying an electrical potential between the working electrode and the counter electrode. The electrocatalyst includes a nickel-calcium-iron layered double hydroxide (NiCaFe-LDH) nanoparticle, the NiCaFe-LDH nanoparticle has a formula of [Fe x )NiCa( 1-x ](OH) 2 (NO 3 ) x .nH 2 O, where: 0.2≤x≤0.4 and 0≤n≤2.5. |