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Layered double hydroxides (LDH) are being used as electrocatalysts for oxygen evolution reactions (OERs). However, low current densities limit their practical applications. Herein, we report a facile and economic synthesis of an iron-copper based LDH integrated with a cobalt-based metal-organic framework (ZIF-12) to form LDH-ZIF-12 composite (1) through a co-precipitation method. The as-synthesized composite  1  requires a low overpotential of 337 mV to achieve a catalytic current density of 10 mA cm −2  with a Tafel slope of 89 mV dec −1 . Tafel analysis further demonstrates that  1  exhibits a slope of 89 mV dec −1  which is much lower than the slope of 284 mV dec −1  for LDH and 172 mV dec −1  for ZIF-12. The slope value of  1  is also lower than previously reported electrocatalysts, including Ni-Co LDH (113 mV dec −1 ) and Zn-Co LDH nanosheets (101 mV dec −1 ), under similar conditions. Controlled potential electrolysis and stability test experiments show the potential application of  1  as a heterogeneous electrocatalyst for water oxidation.

ZIF-12/Fe-Cu LDH Composite as a High Performance Electrocatalyst for Water Oxidation