Abstract
AbstractFe‐based catalysts are promising candidates for water splitting due to the abundant reserves of Fe. However, their electrocatalytic performance toward the oxygen evolution reaction (OER) is still unsatisfactory. Herein, a new hybrid catalyst of Fe7S8/Fe2O3 is designed via a deep eutectic solvent (DES)‐based strategy. The Fe7S8/Fe2O3 particles are in a porous nanosheet structure and possess oxygen vacancy‐rich characteristics. The porous nanosheet structure and oxygen vacancy‐rich Fe2O3 in the Fe7S8/Fe2O3 significantly improves the electrocatalytic activity toward the OER. The as‐prepared Fe7S8/Fe2O3 nanosheets demonstrate a small overpotential of 229 mV at a current density of 10 mA cm−2 with a small Tafel slope of 49 mV dec−1, which outperform most of the state‐of‐the‐art Fe‐based catalysts. This work not only reports a new Fe‐based electrocatalyst with an improved performance toward the OER but also provides a rational DES‐based strategy for construction of advanced catalysts.
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