POM@ZIF Derived Mixed Metal Oxide Catalysts for Sustained Electrocatalytic Oxygen Evolution
Yupeng Zhao, Dandan Gao, Si Liu, Johannes Biskupek, Ute Kaiser, Rongji Liu, Carsten Streb
Abstract
Abstract The design of efficient and stable oxygen evolution reaction (OER) catalysts based on noble‐metal‐free materials is crucial for energy conversion and storage. In this work, it was demonstrated how polyoxometalate (POM)‐doped ZIF‐67 can be converted into a stable oxygen evolution electrocatalyst by chemical etching, cation exchange, and thermal annealing steps. Characterization by X‐ray photoelectron spectroscopy, transmission electron microscopy, energy‐dispersive X‐ray spectroscopy and Raman spectroscopy indicate that POM‐doped ZIF‐67 derived carbon‐supported metal oxides were synthesized. The resulting composite shows structural and compositional advantages which lead to low overpotential (306 mV at j=10 mA ⋅ cm −2 ) and long‐term stability under harsh OER conditions (1.0 M aqueous KOH).