Facile topochemically prepared hierarchical Ni–Fe LDH nanoflowers for the electrochemical oxygen elution reaction

Ni–Fe LDHs prepared via topochemical method composed of co-precipitation of Ni 2+ and Fe 2+ by NH 4 HCO 3 and oxidation intercalation showed good OER performance with overpotential low to 240 mV at 10 mA cm −2 and Tafel slope of 25 mV decade −1 .