Design of Ceo2 Anchored in Cofe-Layered Double Hydroxide Hollow Polyhedra Via an Ion Exchange Strategy for the Oxygen Evolution Reaction

Abstract

The oxygen evolution reaction (OER) is hindered by slow kinetics due to its four-electron process, which limits overall efficiency. Rational design of MOF-based nanomaterials is crucial for enhancing the oxygen production rate. Utilizing a straightforward strategy, we synthesized hollow CoFe-layered double hydroxides (LDH) loaded with CeO2 using ZIF-67 as a precursor. The CoFe-LDH/CeO2 composite demonstrates exceptional OER performance, featuring a lower overpotential (315 mV) at 10 mA cm-2, a smaller Tafel slope (49.53 mV dec-1), and remarkable stability. The high OER activity of CoFe-LDH/CeO2 is attributed to the electron transition of CeO2 within the CoFe-LDH carrier layer, which enhances electron interactions with CoFe-LDH and promotes the catalytic reaction. Based on the outstanding catalytic properties of CoFe-LDH/CeO2, this study provides a promising approach for developing green, cost-effective, and efficient electrocatalysts.

Keywords: ZIF-67, CeO2, CoFe-layered double hydroxide, Hollow polyhedral, Oxygen evolution reaction