Efficient electrocatalytic oxygen evolution by nano NiO-In₂O₃ electrode materials

An effective low-cost nano NiO-In₂O₃ electrode material for oxygen evolution (OER) is presented. Electrochemical studies uncovered electrocatalytic recital in Ascorbic Acid, Hydrogen Peroxide (H₂O₂), and ethanol. The cubic crystal structure of NiO-In₂O₃ was revealed by XRD. FT-IR, FE-SEM and HR-TEM studies exploit the structure and morphology of NiO-In₂O₃. Electrochemistry of NiO-In₂O₃ uncovered high current density (900mA/cm²) at substantially low overpotential (230mV), realizing its OER recital. On top, high mass activity and turnover frequency by NiO-In₂O₃ comprehend improved electrical and semiconductive properties in H₂O₂. The NiO-In₂O₃ durability beyond 90 hours was estimated by chronopotentiometry (CP). The Impedance analysis (EIS) revealed low charge transfer resistance and high exchange current density. Given electrocatalytic studies, we found a direct relationship between NiO-In₂O₃ nanocomposite and the degradation of H₂O₂ compared to its counterparts. Hence, this strategy can be an alternative and potential source of hydrogen and oxygen production at commercial scale. Highlights A facile and effectual low-cost NiO-In₂O₃ electrocatalyst is developed for efficient OER in aqueous hydrogen peroxide. NiO-In₂O₃ nanocomposite showed high current density (900mA/cm²) at low overpotential grasping its oxygen evolution reaction (OER) concert. NiO-In₂O₃ Impedance analysis revealed its low charge transfer resistance, high exchange current density (J_exc.), high mass Activity, and high turnover frequency (TOF) in hydrogen peroxide, advocating enhanced electrical and semiconductive properties. NiO-In₂O₃ showed long-term durability (>90 h) at varying current densities, fostering its application as a potential electrocatalyst for OER/HER reactions.