Iron-based binary metal-organic framework nanorods as an efficient catalyst for the oxygen evolution reaction

First-row transition metal compounds have been widely explored as oxygen evolution reaction (OER) electrocatalysts due to their impressive performance in this application. However, the activity trends of these remain elusive effect inevitable iron impurities alkaline electrolytes on OER; inhomogeneous structure iron-based (oxy)hydroxides further complicates situation. Bimetallic metal-organic frameworks (MOFs) advantages well-defined and uniform atomic structures tunable coordination environments, allowing structure-activity relationships bimetallic sites be precisely explored. Therefore, we prepared a series MOFs (denoted Fe 2 M-MIL-88B, M = Mn, Co, or Ni) systematically compared electrocatalytic OER work. All exhibited higher than monometallic counterpart, with following order FeNi > FeCo FeMn. In an electrolyte, Ni-MIL-88B showed lowest overpotential achieve current density 10 mA cm ?2 (307 mV) smallest Tafel slope (38 mV dec ?1 ). The experimental calculated results demonstrated that nickel strongest coupling series, leading modification electronic structure, which is crucial for tuning activity. induced by introduction second into significantly enhances toward reaction.