In this work, ZIF-67 is self-grown on the NiCo layered double hydroxide (NiCo-LDH) nanosheets-modified Ni foam (NF) surface. Its derivative, the hierarchically structured Co3O4/NiCo2O4/Ni foam (CO/NCO/NF) composite, is successfully fabricated by the oxidation of ZIF-67/NiCo-LDH/ NF, which exhibits excellent electrocatalytic performance. When assessed as an electrode for oxygen evolution reaction (OER), the CO/NCO/NF electrode shows low overpotentials of 320 and 407 mV at 10 and 50 mA cm−2, respectively, in 0.1 M KOH aqueous electrolyte and an excellent long-term electrochemical durability with 88% current preservation during a 60 h test. It is also found that the OER activities of CO/NCO/NF electrode are superior to those of NCO/NF and CO/NF electrodes, demonstrating that the strong interaction of the interconnected interface of Co3O4 nanocages (CO NCs) and NiCo2O4 nanosheets (NCO NSs) is advantageous to increase the number of Co3+, improve conductivity, enhance structural stability, facilitate electronic transfer, and reduce reversible ion accumulation at the interface. In addition, the hierarchical architecture of the composite is binder-free and good for enhancing mass transport, boosting the dissipation of gases, as well as exposing catalytic active sites in the process of water electrolysis.
Superior Oxygen Evolution Reaction Performance of Co3O4/NiCo2O4/Ni foam Composite with Hierarchical StructureArticle
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