Hierarchical 1D-2D Ni-DTO MOF Arrays Derived from Template-Assisted Synthesis Delivering Low-Overpotential Oxygen Evolution Reaction

The development of highly efficient and stable electrocatalysts derived from metal complexes for the oxygen evolution reaction (OER) remains a significant challenge in advancing water-splitting technologies and sustainable energy conversion. In this study, we report the design and synthesis of a hierarchical one-dimensional-two-dimensional (1D-2D) Ni-DTO metal-organic framework (MOF) through a template-assisted solvothermal approach. This carefully engineered architecture not only enhances the surface area and exposes abundant active sites but also facilitates rapid charge transport and mass diffusion, which are critical for catalytic activity. As a precursor for OER catalysts, the Ni-DTO MOF demonstrates remarkable electrochemical performance, achieving a current density of 10 mA cm - 2 at an exceptionally low overpotential of 239 mV, outperforming many conventional Ni-based catalysts. The synergy between the 1D nanorod backbone and 2D nanosheet layers provides structural stability, promoting long-term operational durability under rigorous electrochemical conditions. Moreover, this study highlights a rational strategy for designing MOF-derived materials, where the precursor's hierarchical architecture evolves into robust, high-performance catalysts suitable for energy conversion applications. The insights gained here not only advance our understanding of structure-activity relationships in MOF-based electrocatalysts but also open new avenues for the development of next-generation materials for sustainable hydrogen production and broader electrochemical technologies.