Improving the electrocatalytic efficiency of hydrothermally developed ZnMnO₃ with rGO for oxygen evolution reaction activity

The escalating need for energy in the context of future development has prompted a significant surge in research efforts focused on exploring renewable energy sources. The utilization of transition metal oxides in conjunction with reduced graphene oxide (rGO) as economically viable electrocatalytic materials for the oxygen evaluation reaction (OER). This study showcases a straightforward hydrothermal technique to produce perovskite-type ZnMnO₃ nanoparticles that interact with reduced graphene oxide (rGO) to examine electrocatalytic efficiency of ZnMnO₃/rGO catalyst, particularly in relation to OER. However, electrochemical results of the ZnMnO₃/rGO catalyst exhibited outstanding electrocatalytic performances with significant overpotential (η) of 253 mV at 10 mA cm⁻². Additionally, it exhibited Tafel slope of 38 mV dec⁻¹, indicating efficient catalytic activity. Furthermore, the synthesized catalyst demonstrated a significantly low impedance (R_ct) of 1.91 Ω with higher stability after the 5000th cycle. The catalytic electrode shows excellent long-term stability for OER, making it a promising alternative to electrocatalysts for new-generation applications.