A Highly‐Efficient Oxygen Evolution Electrocatalyst Derived from a Metal‐Organic Framework and Ketjenblack Carbon Material
Seçil Öztürk, Gun‐hee Moon, Alex Spieß, Eko Budiyanto, Stefan Roitsch, Harun Tüysüz, Christoph Janiak
Abstract
Abstract The composite of the metal‐organic framework (MOF) Ni(Fe)‐MOF‐74 and the highly conductive carbon material ketjenblack (KB) could be easily obtained from the in‐situ MOF synthesis in a one‐step solvothermal reaction. The composite material features a remarkable electrochemical oxygen evolution reaction (OER) performance where the overpotential at 10 mA/cm 2 and the current density at 1.7 V RHE are recorded as 0.274 V RHE and 650 mA/cm 2 , respectively, in 1 mol/L KOH. In particular, the activation of nickel‐iron clusters from the MOF under an applied anodic bias steadily boosts the OER performance. Although Ni(Fe)‐MOF‐74 goes through some structural modification during the electrochemical measurements, the stabilized and optimized composite material shows excellent OER performance. This simple strategy to design highly‐efficient electrocatalysts, utilizing readily available precursors and carbon materials, will leverage the use of diverse metal‐organic complexes into electrode fabrication with a high energy conversion efficiency.