High-performance Ni-V-Fe metal-organic framework electrocatalyst composed of integrated nanowires and nanosheets for oxygen evolution reaction

Rational design of nanostructured metal-organic frameworks (MOFs) for catalytic applications is an ongoing challenge. Here, a new hierarchical NiVFe-MOF composed of self-supported nanowires and nanosheets are first prepared through substrate-assisted solvothermal growth. The MOF nanowires and nanosheets are tightly assembled into an integrated nanostructure with facile mass transfer. At the same time, the microstructure of the nanowires/nanosheets exhibits abundant active sites due to the hierarchical porosity. As resultant NiVFe-MOF exhibits significantly enhanced activity in oxygen evolution reaction (OER). The resulting MOF yields a low overpotential (225 mV, 10 mA cm(-2); 269 mV, 100 mA cm(-2)) and high stability after long-term cycling test, suggesting a state-of-the-art performance. This study can provide new insights on rational design and synthesis of nanostructured MOFs for catalytic applications. (C) 2020 Elsevier Ltd. All rights reserved.