Iron(III) ion-assisted transformation of ZIF-67 to a self-supported Fe x Co-layered double hydroxide for improved water oxidation.

Herein, we have demonstrated Lewis acid Fe(III)-assisted hydroxylation of ZIF-67 to form Fe x Co-layered double hydroxide (LDH) nanosheets. The catalyst Fe 0.4 Co-LDH produced an excellent water oxidation activity to reach a current density of 20 mA cm -2 at only 190 mV overpotential, superior to that of hydrothermally synthesized LDH with a similar composition.