Abstract
The development of highly efficient, stable, and cost-effective electrocatalysts for overall water splitting (OWS) is necessary for future renewable and clean energy systems. In this study, MnCo nanostructures were directly grown on Ni foam by a one-step hydrothermal synthesis method for various reaction times, such as 3, 6, 12, and 24 h, and the synthesized samples are denoted as MnCo-3,11MnCo-3 – The MnCo2O4 samples calcined at 400 °C for 3h. MnCo-6,22MnCo-6 – The MnCo2O4 samples calcined at 400 °C for 6h. MnCo-12,33MnCo-12 – The MnCo2O4 samples calcined at 400 °C for 12h. and MnCo-24,44MnCo-24 – The MnCo2O4 samples calcined at 400 °C for 24h. respectively. The scanning electron microscopy (SEM) images confirm the influence of the reaction time on the morphology of the MnCo nanostructures. The synthesized electrocatalysts reveal good catalytic activity for hydrogen evolution reaction (HER) as well as oxygen evolution reaction (OER) in 1.0 M KOH. The MnCo-24 electrocatalyst outperformed the other prepared electrocatalysts, with Tafel slopes of 140 and 148 mV dec−1 and low overpotentials of 200 and 178 mV for the OER and HER, respectively, at a current density of 10 mA cm−2. The MnCo-24 electrocatalyst exhibited excellent stability for up to 24 h for OWS. This work provides a facile strategy for preparing low-priced electrocatalysts with high catalytic activity.
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