Abstract
The oxygen evolution reaction (OER) plays a crucial role in water splitting, an essential reaction enabling the storage of intermittent energies as hydrogen fuel. However, identifying cheap, abundant, yet effective oxygen evolution catalysts to develop water splitting is still a challenge. Here, Fe‐doped lithium cobalt oxide nanosheets have been synthesized via a soft chemical exfoliation method. Electrochemical tests revealed that the as‐obtained Fe‐doped lithium cobalt oxide nanosheets afforded an overpotential of 343 mV at 10 mA cm–2, a mass activity of 88.34 A g–1, and a relatively small Tafel slope of 37.8 mV dec–1. These parameters are better than those of many reported materials and even better than that of the benchmark IrO2. Such an excellent performance can be attributed to the merits of the special electronic structure feature of surface Co ions, high surface area, active sites, and enriched electrophilicity of non‐lattice oxygen species.
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