Abstract
Recently, great efforts have been directed in searching for electrocatalysts for the oxygen evolution reaction (OER). In this work, a series of earth-abundant and low-cost iron-copper oxalates and oxides with varying iron/copper ratios were prepared and further examined as OER electrocatalysts. The structures of the samples were characterized by field emission scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The catalytic performance of the samples was evaluated by linear scanning voltammetry, cyclic voltammetry, electrochemical impedance spectroscopy and chronoamperometry. The electrochemical results indicated that the oxides are better OER candidates than the corresponding oxalates. The coexistence of copper oxide and iron oxide is beneficial for OER activity. Among the samples, the 6CuO-Fe2O3 exhibited the best OER activity. To yield a current density of 10 mA cm−2, only a potential of 1.74 V was required. In addition, the oxide catalysts also had good stability, as confirmed by chronoamperometry tests.
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