Anchoring Ce-modified Ni(OH) nanoparticles on Ni-MOF nanosheets to enhances the oxygen evolution performance.

Constructing a heterostructure is an efficient strategy to enhance the catalytic activity toward the oxygen evolution reaction (OER). Herein, Ce-modified Ni(OH) nanoparticles are anchored on Ni-MOF nanosheets by the electrodeposition strategy, forming a self-supporting electrode of Ce-m-Ni(OH)@Ni-MOF. The Raman spectrum proves that both Ce(OH) and Ce doping exist in Ce-modified Ni(OH) nanoparticles. The heterostructure possesses an open nanosheet structure, with a good interaction between Ni-MOF and Ce-m-Ni(OH), which enables efficient mass/charge transfer and the synergetic effect between Ni and Ce, leading to a high-performance electrocatalyst. Specifically, Ce-m-Ni(OH)@Ni-MOF achieves current densities of 50 and 100 mA cm at low overpotentials of 219 and 272 mV, respectively, and retains high activity for at least 30 h.